{"config":{"lang":["en"],"min_search_length":3,"prebuild_index":false,"separator":"[\\s\\-]+"},"docs":[{"location":"","text":"Built-in Functions ! ! expr - Logical not. Examples: > SELECT ! true; false > SELECT ! false; true > SELECT ! NULL; NULL Since: 1.0.0 % expr1 % expr2 - Returns the remainder after expr1 / expr2 . Examples: > SELECT 2 % 1.8; 0.2 > SELECT MOD(2, 1.8); 0.2 Since: 1.0.0 & expr1 & expr2 - Returns the result of bitwise AND of expr1 and expr2 . Examples: > SELECT 3 & 5; 1 Since: 1.4.0 * expr1 * expr2 - Returns expr1 * expr2 . Examples: > SELECT 2 * 3; 6 Since: 1.0.0 + expr1 + expr2 - Returns expr1 + expr2 . Examples: > SELECT 1 + 2; 3 Since: 1.0.0 - expr1 - expr2 - Returns expr1 - expr2 . Examples: > SELECT 2 - 1; 1 Since: 1.0.0 / expr1 / expr2 - Returns expr1 / expr2 . It always performs floating point division. Examples: > SELECT 3 / 2; 1.5 > SELECT 2L / 2L; 1.0 Since: 1.0.0 < expr1 < expr2 - Returns true if expr1 is less than expr2 . Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be ordered. For example, map type is not orderable, so it is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 1 < 2; true > SELECT 1.1 < '1'; false > SELECT to_date('2009-07-30 04:17:52') < to_date('2009-07-30 04:17:52'); false > SELECT to_date('2009-07-30 04:17:52') < to_date('2009-08-01 04:17:52'); true > SELECT 1 < NULL; NULL Since: 1.0.0 <= expr1 <= expr2 - Returns true if expr1 is less than or equal to expr2 . Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be ordered. For example, map type is not orderable, so it is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 2 <= 2; true > SELECT 1.0 <= '1'; true > SELECT to_date('2009-07-30 04:17:52') <= to_date('2009-07-30 04:17:52'); true > SELECT to_date('2009-07-30 04:17:52') <= to_date('2009-08-01 04:17:52'); true > SELECT 1 <= NULL; NULL Since: 1.0.0 <=> expr1 <=> expr2 - Returns same result as the EQUAL(=) operator for non-null operands, but returns true if both are null, false if one of the them is null. Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be used in equality comparison. Map type is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 2 <=> 2; true > SELECT 1 <=> '1'; true > SELECT true <=> NULL; false > SELECT NULL <=> NULL; true Since: 1.1.0 = expr1 = expr2 - Returns true if expr1 equals expr2 , or false otherwise. Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be used in equality comparison. Map type is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 2 = 2; true > SELECT 1 = '1'; true > SELECT true = NULL; NULL > SELECT NULL = NULL; NULL Since: 1.0.0 == expr1 == expr2 - Returns true if expr1 equals expr2 , or false otherwise. Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be used in equality comparison. Map type is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 2 == 2; true > SELECT 1 == '1'; true > SELECT true == NULL; NULL > SELECT NULL == NULL; NULL Since: 1.0.0 > expr1 > expr2 - Returns true if expr1 is greater than expr2 . Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be ordered. For example, map type is not orderable, so it is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 2 > 1; true > SELECT 2 > '1.1'; true > SELECT to_date('2009-07-30 04:17:52') > to_date('2009-07-30 04:17:52'); false > SELECT to_date('2009-07-30 04:17:52') > to_date('2009-08-01 04:17:52'); false > SELECT 1 > NULL; NULL Since: 1.0.0 >= expr1 >= expr2 - Returns true if expr1 is greater than or equal to expr2 . Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be ordered. For example, map type is not orderable, so it is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 2 >= 1; true > SELECT 2.0 >= '2.1'; false > SELECT to_date('2009-07-30 04:17:52') >= to_date('2009-07-30 04:17:52'); true > SELECT to_date('2009-07-30 04:17:52') >= to_date('2009-08-01 04:17:52'); false > SELECT 1 >= NULL; NULL Since: 1.0.0 ^ expr1 ^ expr2 - Returns the result of bitwise exclusive OR of expr1 and expr2 . Examples: > SELECT 3 ^ 5; 6 Since: 1.4.0 abs abs(expr) - Returns the absolute value of the numeric value. Examples: > SELECT abs(-1); 1 Since: 1.2.0 acos acos(expr) - Returns the inverse cosine (a.k.a. arc cosine) of expr , as if computed by java.lang.Math.acos . Examples: > SELECT acos(1); 0.0 > SELECT acos(2); NaN Since: 1.4.0 acosh acosh(expr) - Returns inverse hyperbolic cosine of expr . Examples: > SELECT acosh(1); 0.0 > SELECT acosh(0); NaN Since: 3.0.0 add_months add_months(start_date, num_months) - Returns the date that is num_months after start_date . Examples: > SELECT add_months('2016-08-31', 1); 2016-09-30 Since: 1.5.0 aggregate aggregate(expr, start, merge, finish) - Applies a binary operator to an initial state and all elements in the array, and reduces this to a single state. The final state is converted into the final result by applying a finish function. Examples: > SELECT aggregate(array(1, 2, 3), 0, (acc, x) -> acc + x); 6 > SELECT aggregate(array(1, 2, 3), 0, (acc, x) -> acc + x, acc -> acc * 10); 60 Since: 2.4.0 and expr1 and expr2 - Logical AND. Examples: > SELECT true and true; true > SELECT true and false; false > SELECT true and NULL; NULL > SELECT false and NULL; false Since: 1.0.0 any any(expr) - Returns true if at least one value of expr is true. Examples: > SELECT any(col) FROM VALUES (true), (false), (false) AS tab(col); true > SELECT any(col) FROM VALUES (NULL), (true), (false) AS tab(col); true > SELECT any(col) FROM VALUES (false), (false), (NULL) AS tab(col); false Since: 3.0.0 approx_count_distinct approx_count_distinct(expr[, relativeSD]) - Returns the estimated cardinality by HyperLogLog++. relativeSD defines the maximum relative standard deviation allowed. Examples: > SELECT approx_count_distinct(col1) FROM VALUES (1), (1), (2), (2), (3) tab(col1); 3 Since: 1.6.0 approx_percentile approx_percentile(col, percentage [, accuracy]) - Returns the approximate percentile of the numeric column col which is the smallest value in the ordered col values (sorted from least to greatest) such that no more than percentage of col values is less than the value or equal to that value. The value of percentage must be between 0.0 and 1.0. The accuracy parameter (default: 10000) is a positive numeric literal which controls approximation accuracy at the cost of memory. Higher value of accuracy yields better accuracy, 1.0/accuracy is the relative error of the approximation. When percentage is an array, each value of the percentage array must be between 0.0 and 1.0. In this case, returns the approximate percentile array of column col at the given percentage array. Examples: > SELECT approx_percentile(col, array(0.5, 0.4, 0.1), 100) FROM VALUES (0), (1), (2), (10) AS tab(col); [1,1,0] > SELECT approx_percentile(col, 0.5, 100) FROM VALUES (0), (6), (7), (9), (10) AS tab(col); 7 Since: 2.1.0 array array(expr, ...) - Returns an array with the given elements. Examples: > SELECT array(1, 2, 3); [1,2,3] Since: 1.1.0 array_contains array_contains(array, value) - Returns true if the array contains the value. Examples: > SELECT array_contains(array(1, 2, 3), 2); true Since: 1.5.0 array_distinct array_distinct(array) - Removes duplicate values from the array. Examples: > SELECT array_distinct(array(1, 2, 3, null, 3)); [1,2,3,null] Since: 2.4.0 array_except array_except(array1, array2) - Returns an array of the elements in array1 but not in array2, without duplicates. Examples: > SELECT array_except(array(1, 2, 3), array(1, 3, 5)); [2] Since: 2.4.0 array_intersect array_intersect(array1, array2) - Returns an array of the elements in the intersection of array1 and array2, without duplicates. Examples: > SELECT array_intersect(array(1, 2, 3), array(1, 3, 5)); [1,3] Since: 2.4.0 array_join array_join(array, delimiter[, nullReplacement]) - Concatenates the elements of the given array using the delimiter and an optional string to replace nulls. If no value is set for nullReplacement, any null value is filtered. Examples: > SELECT array_join(array('hello', 'world'), ' '); hello world > SELECT array_join(array('hello', null ,'world'), ' '); hello world > SELECT array_join(array('hello', null ,'world'), ' ', ','); hello , world Since: 2.4.0 array_max array_max(array) - Returns the maximum value in the array. NULL elements are skipped. Examples: > SELECT array_max(array(1, 20, null, 3)); 20 Since: 2.4.0 array_min array_min(array) - Returns the minimum value in the array. NULL elements are skipped. Examples: > SELECT array_min(array(1, 20, null, 3)); 1 Since: 2.4.0 array_position array_position(array, element) - Returns the (1-based) index of the first element of the array as long. Examples: > SELECT array_position(array(3, 2, 1), 1); 3 Since: 2.4.0 array_remove array_remove(array, element) - Remove all elements that equal to element from array. Examples: > SELECT array_remove(array(1, 2, 3, null, 3), 3); [1,2,null] Since: 2.4.0 array_repeat array_repeat(element, count) - Returns the array containing element count times. Examples: > SELECT array_repeat('123', 2); [\"123\",\"123\"] Since: 2.4.0 array_sort array_sort(expr, func) - Sorts the input array. If func is omitted, sort in ascending order. The elements of the input array must be orderable. Null elements will be placed at the end of the returned array. Since 3.0.0 this function also sorts and returns the array based on the given comparator function. The comparator will take two arguments representing two elements of the array. It returns -1, 0, or 1 as the first element is less than, equal to, or greater than the second element. If the comparator function returns other values (including null), the function will fail and raise an error. Examples: > SELECT array_sort(array(5, 6, 1), (left, right) -> case when left < right then -1 when left > right then 1 else 0 end); [1,5,6] > SELECT array_sort(array('bc', 'ab', 'dc'), (left, right) -> case when left is null and right is null then 0 when left is null then -1 when right is null then 1 when left < right then 1 when left > right then -1 else 0 end); [\"dc\",\"bc\",\"ab\"] > SELECT array_sort(array('b', 'd', null, 'c', 'a')); [\"a\",\"b\",\"c\",\"d\",null] Since: 2.4.0 array_union array_union(array1, array2) - Returns an array of the elements in the union of array1 and array2, without duplicates. Examples: > SELECT array_union(array(1, 2, 3), array(1, 3, 5)); [1,2,3,5] Since: 2.4.0 arrays_overlap arrays_overlap(a1, a2) - Returns true if a1 contains at least a non-null element present also in a2. If the arrays have no common element and they are both non-empty and either of them contains a null element null is returned, false otherwise. Examples: > SELECT arrays_overlap(array(1, 2, 3), array(3, 4, 5)); true Since: 2.4.0 arrays_zip arrays_zip(a1, a2, ...) - Returns a merged array of structs in which the N-th struct contains all N-th values of input arrays. Examples: > SELECT arrays_zip(array(1, 2, 3), array(2, 3, 4)); [{\"0\":1,\"1\":2},{\"0\":2,\"1\":3},{\"0\":3,\"1\":4}] > SELECT arrays_zip(array(1, 2), array(2, 3), array(3, 4)); [{\"0\":1,\"1\":2,\"2\":3},{\"0\":2,\"1\":3,\"2\":4}] Since: 2.4.0 ascii ascii(str) - Returns the numeric value of the first character of str . Examples: > SELECT ascii('222'); 50 > SELECT ascii(2); 50 Since: 1.5.0 asin asin(expr) - Returns the inverse sine (a.k.a. arc sine) the arc sin of expr , as if computed by java.lang.Math.asin . Examples: > SELECT asin(0); 0.0 > SELECT asin(2); NaN Since: 1.4.0 asinh asinh(expr) - Returns inverse hyperbolic sine of expr . Examples: > SELECT asinh(0); 0.0 Since: 3.0.0 assert_true assert_true(expr) - Throws an exception if expr is not true. Examples: > SELECT assert_true(0 < 1); NULL Since: 2.0.0 atan atan(expr) - Returns the inverse tangent (a.k.a. arc tangent) of expr , as if computed by java.lang.Math.atan Examples: > SELECT atan(0); 0.0 Since: 1.4.0 atan2 atan2(exprY, exprX) - Returns the angle in radians between the positive x-axis of a plane and the point given by the coordinates ( exprX , exprY ), as if computed by java.lang.Math.atan2 . Arguments: exprY - coordinate on y-axis exprX - coordinate on x-axis Examples: > SELECT atan2(0, 0); 0.0 Since: 1.4.0 atanh atanh(expr) - Returns inverse hyperbolic tangent of expr . Examples: > SELECT atanh(0); 0.0 > SELECT atanh(2); NaN Since: 3.0.0 avg avg(expr) - Returns the mean calculated from values of a group. Examples: > SELECT avg(col) FROM VALUES (1), (2), (3) AS tab(col); 2.0 > SELECT avg(col) FROM VALUES (1), (2), (NULL) AS tab(col); 1.5 Since: 1.0.0 base64 base64(bin) - Converts the argument from a binary bin to a base 64 string. Examples: > SELECT base64('Spark SQL'); U3BhcmsgU1FM Since: 1.5.0 bigint bigint(expr) - Casts the value expr to the target data type bigint . Since: 2.0.1 bin bin(expr) - Returns the string representation of the long value expr represented in binary. Examples: > SELECT bin(13); 1101 > SELECT bin(-13); 1111111111111111111111111111111111111111111111111111111111110011 > SELECT bin(13.3); 1101 Since: 1.5.0 binary binary(expr) - Casts the value expr to the target data type binary . Since: 2.0.1 bit_and bit_and(expr) - Returns the bitwise AND of all non-null input values, or null if none. Examples: > SELECT bit_and(col) FROM VALUES (3), (5) AS tab(col); 1 Since: 3.0.0 bit_count bit_count(expr) - Returns the number of bits that are set in the argument expr as an unsigned 64-bit integer, or NULL if the argument is NULL. Examples: > SELECT bit_count(0); 0 Since: 3.0.0 bit_length bit_length(expr) - Returns the bit length of string data or number of bits of binary data. Examples: > SELECT bit_length('Spark SQL'); 72 Since: 2.3.0 bit_or bit_or(expr) - Returns the bitwise OR of all non-null input values, or null if none. Examples: > SELECT bit_or(col) FROM VALUES (3), (5) AS tab(col); 7 Since: 3.0.0 bit_xor bit_xor(expr) - Returns the bitwise XOR of all non-null input values, or null if none. Examples: > SELECT bit_xor(col) FROM VALUES (3), (5) AS tab(col); 6 Since: 3.0.0 bool_and bool_and(expr) - Returns true if all values of expr are true. Examples: > SELECT bool_and(col) FROM VALUES (true), (true), (true) AS tab(col); true > SELECT bool_and(col) FROM VALUES (NULL), (true), (true) AS tab(col); true > SELECT bool_and(col) FROM VALUES (true), (false), (true) AS tab(col); false Since: 3.0.0 bool_or bool_or(expr) - Returns true if at least one value of expr is true. Examples: > SELECT bool_or(col) FROM VALUES (true), (false), (false) AS tab(col); true > SELECT bool_or(col) FROM VALUES (NULL), (true), (false) AS tab(col); true > SELECT bool_or(col) FROM VALUES (false), (false), (NULL) AS tab(col); false Since: 3.0.0 boolean boolean(expr) - Casts the value expr to the target data type boolean . Since: 2.0.1 bround bround(expr, d) - Returns expr rounded to d decimal places using HALF_EVEN rounding mode. Examples: > SELECT bround(2.5, 0); 2 Since: 2.0.0 cardinality cardinality(expr) - Returns the size of an array or a map. The function returns null for null input if spark.sql.legacy.sizeOfNull is set to false or spark.sql.ansi.enabled is set to true. Otherwise, the function returns -1 for null input. With the default settings, the function returns -1 for null input. Examples: > SELECT cardinality(array('b', 'd', 'c', 'a')); 4 > SELECT cardinality(map('a', 1, 'b', 2)); 2 > SELECT cardinality(NULL); -1 Since: 1.5.0 cast cast(expr AS type) - Casts the value expr to the target data type type . Examples: > SELECT cast('10' as int); 10 Since: 1.0.0 cbrt cbrt(expr) - Returns the cube root of expr . Examples: > SELECT cbrt(27.0); 3.0 Since: 1.4.0 ceil ceil(expr) - Returns the smallest integer not smaller than expr . Examples: > SELECT ceil(-0.1); 0 > SELECT ceil(5); 5 Since: 1.4.0 ceiling ceiling(expr) - Returns the smallest integer not smaller than expr . Examples: > SELECT ceiling(-0.1); 0 > SELECT ceiling(5); 5 Since: 1.4.0 char char(expr) - Returns the ASCII character having the binary equivalent to expr . If n is larger than 256 the result is equivalent to chr(n % 256) Examples: > SELECT char(65); A Since: 2.3.0 char_length char_length(expr) - Returns the character length of string data or number of bytes of binary data. The length of string data includes the trailing spaces. The length of binary data includes binary zeros. Examples: > SELECT char_length('Spark SQL '); 10 > SELECT CHAR_LENGTH('Spark SQL '); 10 > SELECT CHARACTER_LENGTH('Spark SQL '); 10 Since: 1.5.0 character_length character_length(expr) - Returns the character length of string data or number of bytes of binary data. The length of string data includes the trailing spaces. The length of binary data includes binary zeros. Examples: > SELECT character_length('Spark SQL '); 10 > SELECT CHAR_LENGTH('Spark SQL '); 10 > SELECT CHARACTER_LENGTH('Spark SQL '); 10 Since: 1.5.0 chr chr(expr) - Returns the ASCII character having the binary equivalent to expr . If n is larger than 256 the result is equivalent to chr(n % 256) Examples: > SELECT chr(65); A Since: 2.3.0 coalesce coalesce(expr1, expr2, ...) - Returns the first non-null argument if exists. Otherwise, null. Examples: > SELECT coalesce(NULL, 1, NULL); 1 Since: 1.0.0 collect_list collect_list(expr) - Collects and returns a list of non-unique elements. Examples: > SELECT collect_list(col) FROM VALUES (1), (2), (1) AS tab(col); [1,2,1] Note: The function is non-deterministic because the order of collected results depends on the order of the rows which may be non-deterministic after a shuffle. Since: 2.0.0 collect_set collect_set(expr) - Collects and returns a set of unique elements. Examples: > SELECT collect_set(col) FROM VALUES (1), (2), (1) AS tab(col); [1,2] Note: The function is non-deterministic because the order of collected results depends on the order of the rows which may be non-deterministic after a shuffle. Since: 2.0.0 concat concat(col1, col2, ..., colN) - Returns the concatenation of col1, col2, ..., colN. Examples: > SELECT concat('Spark', 'SQL'); SparkSQL > SELECT concat(array(1, 2, 3), array(4, 5), array(6)); [1,2,3,4,5,6] Note: Concat logic for arrays is available since 2.4.0. Since: 1.5.0 concat_ws concat_ws(sep[, str | array(str)]+) - Returns the concatenation of the strings separated by sep . Examples: > SELECT concat_ws(' ', 'Spark', 'SQL'); Spark SQL > SELECT concat_ws('s'); Since: 1.5.0 conv conv(num, from_base, to_base) - Convert num from from_base to to_base . Examples: > SELECT conv('100', 2, 10); 4 > SELECT conv(-10, 16, -10); -16 Since: 1.5.0 corr corr(expr1, expr2) - Returns Pearson coefficient of correlation between a set of number pairs. Examples: > SELECT corr(c1, c2) FROM VALUES (3, 2), (3, 3), (6, 4) as tab(c1, c2); 0.8660254037844387 Since: 1.6.0 cos cos(expr) - Returns the cosine of expr , as if computed by java.lang.Math.cos . Arguments: expr - angle in radians Examples: > SELECT cos(0); 1.0 Since: 1.4.0 cosh cosh(expr) - Returns the hyperbolic cosine of expr , as if computed by java.lang.Math.cosh . Arguments: expr - hyperbolic angle Examples: > SELECT cosh(0); 1.0 Since: 1.4.0 cot cot(expr) - Returns the cotangent of expr , as if computed by 1/java.lang.Math.cot . Arguments: expr - angle in radians Examples: > SELECT cot(1); 0.6420926159343306 Since: 2.3.0 count count(*) - Returns the total number of retrieved rows, including rows containing null. count(expr[, expr...]) - Returns the number of rows for which the supplied expression(s) are all non-null. count(DISTINCT expr[, expr...]) - Returns the number of rows for which the supplied expression(s) are unique and non-null. Examples: > SELECT count(*) FROM VALUES (NULL), (5), (5), (20) AS tab(col); 4 > SELECT count(col) FROM VALUES (NULL), (5), (5), (20) AS tab(col); 3 > SELECT count(DISTINCT col) FROM VALUES (NULL), (5), (5), (10) AS tab(col); 2 Since: 1.0.0 count_if count_if(expr) - Returns the number of TRUE values for the expression. Examples: > SELECT count_if(col % 2 = 0) FROM VALUES (NULL), (0), (1), (2), (3) AS tab(col); 2 > SELECT count_if(col IS NULL) FROM VALUES (NULL), (0), (1), (2), (3) AS tab(col); 1 Since: 3.0.0 count_min_sketch count_min_sketch(col, eps, confidence, seed) - Returns a count-min sketch of a column with the given esp, confidence and seed. The result is an array of bytes, which can be deserialized to a CountMinSketch before usage. Count-min sketch is a probabilistic data structure used for cardinality estimation using sub-linear space. Examples: > SELECT hex(count_min_sketch(col, 0.5d, 0.5d, 1)) FROM VALUES (1), (2), (1) AS tab(col); 0000000100000000000000030000000100000004000000005D8D6AB90000000000000000000000000000000200000000000000010000000000000000 Since: 2.2.0 covar_pop covar_pop(expr1, expr2) - Returns the population covariance of a set of number pairs. Examples: > SELECT covar_pop(c1, c2) FROM VALUES (1,1), (2,2), (3,3) AS tab(c1, c2); 0.6666666666666666 Since: 2.0.0 covar_samp covar_samp(expr1, expr2) - Returns the sample covariance of a set of number pairs. Examples: > SELECT covar_samp(c1, c2) FROM VALUES (1,1), (2,2), (3,3) AS tab(c1, c2); 1.0 Since: 2.0.0 crc32 crc32(expr) - Returns a cyclic redundancy check value of the expr as a bigint. Examples: > SELECT crc32('Spark'); 1557323817 Since: 1.5.0 cube cube([col1[, col2 ..]]) - create a multi-dimensional cube using the specified columns so that we can run aggregation on them. Examples: > SELECT name, age, count(*) FROM VALUES (2, 'Alice'), (5, 'Bob') people(age, name) GROUP BY cube(name, age); Bob 5 1 Alice 2 1 Alice NULL 1 NULL 2 1 NULL NULL 2 Bob NULL 1 NULL 5 1 Since: 2.0.0 cume_dist cume_dist() - Computes the position of a value relative to all values in the partition. Examples: > SELECT a, b, cume_dist() OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 0.6666666666666666 A1 1 0.6666666666666666 A1 2 1.0 A2 3 1.0 Since: 2.0.0 current_catalog current_catalog() - Returns the current catalog. Examples: > SELECT current_catalog(); spark_catalog Since: 3.1.0 current_database current_database() - Returns the current database. Examples: > SELECT current_database(); default Since: 1.6.0 current_date current_date() - Returns the current date at the start of query evaluation. All calls of current_date within the same query return the same value. current_date - Returns the current date at the start of query evaluation. Examples: > SELECT current_date(); 2020-04-25 > SELECT current_date; 2020-04-25 Note: The syntax without braces has been supported since 2.0.1. Since: 1.5.0 current_timestamp current_timestamp() - Returns the current timestamp at the start of query evaluation. All calls of current_timestamp within the same query return the same value. current_timestamp - Returns the current timestamp at the start of query evaluation. Examples: > SELECT current_timestamp(); 2020-04-25 15:49:11.914 > SELECT current_timestamp; 2020-04-25 15:49:11.914 Note: The syntax without braces has been supported since 2.0.1. Since: 1.5.0 current_timezone current_timezone() - Returns the current session local timezone. Examples: > SELECT current_timezone(); Asia/Shanghai Since: 3.1.0 date date(expr) - Casts the value expr to the target data type date . Since: 2.0.1 date_add date_add(start_date, num_days) - Returns the date that is num_days after start_date . Examples: > SELECT date_add('2016-07-30', 1); 2016-07-31 Since: 1.5.0 date_format date_format(timestamp, fmt) - Converts timestamp to a value of string in the format specified by the date format fmt . Arguments: timestamp - A date/timestamp or string to be converted to the given format. fmt - Date/time format pattern to follow. See Datetime Patterns for valid date and time format patterns. Examples: > SELECT date_format('2016-04-08', 'y'); 2016 Since: 1.5.0 date_from_unix_date date_from_unix_date(days) - Create date from the number of days since 1970-01-01. Examples: > SELECT date_from_unix_date(1); 1970-01-02 Since: 3.1.0 date_part date_part(field, source) - Extracts a part of the date/timestamp or interval source. Arguments: field - selects which part of the source should be extracted, and supported string values are as same as the fields of the equivalent function EXTRACT . source - a date/timestamp or interval column from where field should be extracted Examples: > SELECT date_part('YEAR', TIMESTAMP '2019-08-12 01:00:00.123456'); 2019 > SELECT date_part('week', timestamp'2019-08-12 01:00:00.123456'); 33 > SELECT date_part('doy', DATE'2019-08-12'); 224 > SELECT date_part('SECONDS', timestamp'2019-10-01 00:00:01.000001'); 1.000001 > SELECT date_part('days', interval 1 year 10 months 5 days); 5 > SELECT date_part('seconds', interval 5 hours 30 seconds 1 milliseconds 1 microseconds); 30.001001 Note: The date_part function is equivalent to the SQL-standard function EXTRACT(field FROM source) Since: 3.0.0 date_sub date_sub(start_date, num_days) - Returns the date that is num_days before start_date . Examples: > SELECT date_sub('2016-07-30', 1); 2016-07-29 Since: 1.5.0 date_trunc date_trunc(fmt, ts) - Returns timestamp ts truncated to the unit specified by the format model fmt . Arguments: fmt - the format representing the unit to be truncated to \"YEAR\", \"YYYY\", \"YY\" - truncate to the first date of the year that the ts falls in, the time part will be zero out \"QUARTER\" - truncate to the first date of the quarter that the ts falls in, the time part will be zero out \"MONTH\", \"MM\", \"MON\" - truncate to the first date of the month that the ts falls in, the time part will be zero out \"WEEK\" - truncate to the Monday of the week that the ts falls in, the time part will be zero out \"DAY\", \"DD\" - zero out the time part \"HOUR\" - zero out the minute and second with fraction part \"MINUTE\"- zero out the second with fraction part \"SECOND\" - zero out the second fraction part \"MILLISECOND\" - zero out the microseconds \"MICROSECOND\" - everything remains ts - datetime value or valid timestamp string Examples: > SELECT date_trunc('YEAR', '2015-03-05T09:32:05.359'); 2015-01-01 00:00:00 > SELECT date_trunc('MM', '2015-03-05T09:32:05.359'); 2015-03-01 00:00:00 > SELECT date_trunc('DD', '2015-03-05T09:32:05.359'); 2015-03-05 00:00:00 > SELECT date_trunc('HOUR', '2015-03-05T09:32:05.359'); 2015-03-05 09:00:00 > SELECT date_trunc('MILLISECOND', '2015-03-05T09:32:05.123456'); 2015-03-05 09:32:05.123 Since: 2.3.0 datediff datediff(endDate, startDate) - Returns the number of days from startDate to endDate . Examples: > SELECT datediff('2009-07-31', '2009-07-30'); 1 > SELECT datediff('2009-07-30', '2009-07-31'); -1 Since: 1.5.0 day day(date) - Returns the day of month of the date/timestamp. Examples: > SELECT day('2009-07-30'); 30 Since: 1.5.0 dayofmonth dayofmonth(date) - Returns the day of month of the date/timestamp. Examples: > SELECT dayofmonth('2009-07-30'); 30 Since: 1.5.0 dayofweek dayofweek(date) - Returns the day of the week for date/timestamp (1 = Sunday, 2 = Monday, ..., 7 = Saturday). Examples: > SELECT dayofweek('2009-07-30'); 5 Since: 2.3.0 dayofyear dayofyear(date) - Returns the day of year of the date/timestamp. Examples: > SELECT dayofyear('2016-04-09'); 100 Since: 1.5.0 decimal decimal(expr) - Casts the value expr to the target data type decimal . Since: 2.0.1 decode decode(bin, charset) - Decodes the first argument using the second argument character set. Examples: > SELECT decode(encode('abc', 'utf-8'), 'utf-8'); abc Since: 1.5.0 degrees degrees(expr) - Converts radians to degrees. Arguments: expr - angle in radians Examples: > SELECT degrees(3.141592653589793); 180.0 Since: 1.4.0 dense_rank dense_rank() - Computes the rank of a value in a group of values. The result is one plus the previously assigned rank value. Unlike the function rank, dense_rank will not produce gaps in the ranking sequence. Arguments: children - this is to base the rank on; a change in the value of one the children will trigger a change in rank. This is an internal parameter and will be assigned by the Analyser. Examples: > SELECT a, b, dense_rank(b) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 1 A1 1 1 A1 2 2 A2 3 1 Since: 2.0.0 div expr1 div expr2 - Divide expr1 by expr2 . It returns NULL if an operand is NULL or expr2 is 0. The result is casted to long. Examples: > SELECT 3 div 2; 1 Since: 3.0.0 double double(expr) - Casts the value expr to the target data type double . Since: 2.0.1 e e() - Returns Euler's number, e. Examples: > SELECT e(); 2.718281828459045 Since: 1.5.0 element_at element_at(array, index) - Returns element of array at given (1-based) index. If index < 0, accesses elements from the last to the first. The function returns NULL if the index exceeds the length of the array and spark.sql.ansi.enabled is set to false. If spark.sql.ansi.enabled is set to true, it throws ArrayIndexOutOfBoundsException for invalid indices. element_at(map, key) - Returns value for given key. The function returns NULL if the key is not contained in the map and spark.sql.ansi.enabled is set to false. If spark.sql.ansi.enabled is set to true, it throws NoSuchElementException instead. Examples: > SELECT element_at(array(1, 2, 3), 2); 2 > SELECT element_at(map(1, 'a', 2, 'b'), 2); b Since: 2.4.0 elt elt(n, input1, input2, ...) - Returns the n -th input, e.g., returns input2 when n is 2. The function returns NULL if the index exceeds the length of the array and spark.sql.ansi.enabled is set to false. If spark.sql.ansi.enabled is set to true, it throws ArrayIndexOutOfBoundsException for invalid indices. Examples: > SELECT elt(1, 'scala', 'java'); scala Since: 2.0.0 encode encode(str, charset) - Encodes the first argument using the second argument character set. Examples: > SELECT encode('abc', 'utf-8'); abc Since: 1.5.0 every every(expr) - Returns true if all values of expr are true. Examples: > SELECT every(col) FROM VALUES (true), (true), (true) AS tab(col); true > SELECT every(col) FROM VALUES (NULL), (true), (true) AS tab(col); true > SELECT every(col) FROM VALUES (true), (false), (true) AS tab(col); false Since: 3.0.0 exists exists(expr, pred) - Tests whether a predicate holds for one or more elements in the array. Examples: > SELECT exists(array(1, 2, 3), x -> x % 2 == 0); true > SELECT exists(array(1, 2, 3), x -> x % 2 == 10); false > SELECT exists(array(1, null, 3), x -> x % 2 == 0); NULL > SELECT exists(array(0, null, 2, 3, null), x -> x IS NULL); true > SELECT exists(array(1, 2, 3), x -> x IS NULL); false Since: 2.4.0 exp exp(expr) - Returns e to the power of expr . Examples: > SELECT exp(0); 1.0 Since: 1.4.0 explode explode(expr) - Separates the elements of array expr into multiple rows, or the elements of map expr into multiple rows and columns. Unless specified otherwise, uses the default column name col for elements of the array or key and value for the elements of the map. Examples: > SELECT explode(array(10, 20)); 10 20 Since: 1.0.0 explode_outer explode_outer(expr) - Separates the elements of array expr into multiple rows, or the elements of map expr into multiple rows and columns. Unless specified otherwise, uses the default column name col for elements of the array or key and value for the elements of the map. Examples: > SELECT explode_outer(array(10, 20)); 10 20 Since: 1.0.0 expm1 expm1(expr) - Returns exp( expr ) - 1. Examples: > SELECT expm1(0); 0.0 Since: 1.4.0 extract extract(field FROM source) - Extracts a part of the date/timestamp or interval source. Arguments: field - selects which part of the source should be extracted Supported string values of field for dates and timestamps are(case insensitive): \"YEAR\", (\"Y\", \"YEARS\", \"YR\", \"YRS\") - the year field \"YEAROFWEEK\" - the ISO 8601 week-numbering year that the datetime falls in. For example, 2005-01-02 is part of the 53rd week of year 2004, so the result is 2004 \"QUARTER\", (\"QTR\") - the quarter (1 - 4) of the year that the datetime falls in \"MONTH\", (\"MON\", \"MONS\", \"MONTHS\") - the month field (1 - 12) \"WEEK\", (\"W\", \"WEEKS\") - the number of the ISO 8601 week-of-week-based-year. A week is considered to start on a Monday and week 1 is the first week with >3 days. In the ISO week-numbering system, it is possible for early-January dates to be part of the 52nd or 53rd week of the previous year, and for late-December dates to be part of the first week of the next year. For example, 2005-01-02 is part of the 53rd week of year 2004, while 2012-12-31 is part of the first week of 2013 \"DAY\", (\"D\", \"DAYS\") - the day of the month field (1 - 31) \"DAYOFWEEK\",(\"DOW\") - the day of the week for datetime as Sunday(1) to Saturday(7) \"DAYOFWEEK_ISO\",(\"DOW_ISO\") - ISO 8601 based day of the week for datetime as Monday(1) to Sunday(7) \"DOY\" - the day of the year (1 - 365/366) \"HOUR\", (\"H\", \"HOURS\", \"HR\", \"HRS\") - The hour field (0 - 23) \"MINUTE\", (\"M\", \"MIN\", \"MINS\", \"MINUTES\") - the minutes field (0 - 59) \"SECOND\", (\"S\", \"SEC\", \"SECONDS\", \"SECS\") - the seconds field, including fractional parts Supported string values of field for interval(which consists of months , days , microseconds ) are(case insensitive): \"YEAR\", (\"Y\", \"YEARS\", \"YR\", \"YRS\") - the total months / 12 \"MONTH\", (\"MON\", \"MONS\", \"MONTHS\") - the total months % 12 \"DAY\", (\"D\", \"DAYS\") - the days part of interval \"HOUR\", (\"H\", \"HOURS\", \"HR\", \"HRS\") - how many hours the microseconds contains \"MINUTE\", (\"M\", \"MIN\", \"MINS\", \"MINUTES\") - how many minutes left after taking hours from microseconds \"SECOND\", (\"S\", \"SEC\", \"SECONDS\", \"SECS\") - how many second with fractions left after taking hours and minutes from microseconds source - a date/timestamp or interval column from where field should be extracted Examples: > SELECT extract(YEAR FROM TIMESTAMP '2019-08-12 01:00:00.123456'); 2019 > SELECT extract(week FROM timestamp'2019-08-12 01:00:00.123456'); 33 > SELECT extract(doy FROM DATE'2019-08-12'); 224 > SELECT extract(SECONDS FROM timestamp'2019-10-01 00:00:01.000001'); 1.000001 > SELECT extract(days FROM interval 1 year 10 months 5 days); 5 > SELECT extract(seconds FROM interval 5 hours 30 seconds 1 milliseconds 1 microseconds); 30.001001 Note: The extract function is equivalent to date_part(field, source) . Since: 3.0.0 factorial factorial(expr) - Returns the factorial of expr . expr is [0..20]. Otherwise, null. Examples: > SELECT factorial(5); 120 Since: 1.5.0 filter filter(expr, func) - Filters the input array using the given predicate. Examples: > SELECT filter(array(1, 2, 3), x -> x % 2 == 1); [1,3] > SELECT filter(array(0, 2, 3), (x, i) -> x > i); [2,3] > SELECT filter(array(0, null, 2, 3, null), x -> x IS NOT NULL); [0,2,3] Note: The inner function may use the index argument since 3.0.0. Since: 2.4.0 find_in_set find_in_set(str, str_array) - Returns the index (1-based) of the given string ( str ) in the comma-delimited list ( str_array ). Returns 0, if the string was not found or if the given string ( str ) contains a comma. Examples: > SELECT find_in_set('ab','abc,b,ab,c,def'); 3 Since: 1.5.0 first first(expr[, isIgnoreNull]) - Returns the first value of expr for a group of rows. If isIgnoreNull is true, returns only non-null values. Examples: > SELECT first(col) FROM VALUES (10), (5), (20) AS tab(col); 10 > SELECT first(col) FROM VALUES (NULL), (5), (20) AS tab(col); NULL > SELECT first(col, true) FROM VALUES (NULL), (5), (20) AS tab(col); 5 Note: The function is non-deterministic because its results depends on the order of the rows which may be non-deterministic after a shuffle. Since: 2.0.0 first_value first_value(expr[, isIgnoreNull]) - Returns the first value of expr for a group of rows. If isIgnoreNull is true, returns only non-null values. Examples: > SELECT first_value(col) FROM VALUES (10), (5), (20) AS tab(col); 10 > SELECT first_value(col) FROM VALUES (NULL), (5), (20) AS tab(col); NULL > SELECT first_value(col, true) FROM VALUES (NULL), (5), (20) AS tab(col); 5 Note: The function is non-deterministic because its results depends on the order of the rows which may be non-deterministic after a shuffle. Since: 2.0.0 flatten flatten(arrayOfArrays) - Transforms an array of arrays into a single array. Examples: > SELECT flatten(array(array(1, 2), array(3, 4))); [1,2,3,4] Since: 2.4.0 float float(expr) - Casts the value expr to the target data type float . Since: 2.0.1 floor floor(expr) - Returns the largest integer not greater than expr . Examples: > SELECT floor(-0.1); -1 > SELECT floor(5); 5 Since: 1.4.0 forall forall(expr, pred) - Tests whether a predicate holds for all elements in the array. Examples: > SELECT forall(array(1, 2, 3), x -> x % 2 == 0); false > SELECT forall(array(2, 4, 8), x -> x % 2 == 0); true > SELECT forall(array(1, null, 3), x -> x % 2 == 0); false > SELECT forall(array(2, null, 8), x -> x % 2 == 0); NULL Since: 3.0.0 format_number format_number(expr1, expr2) - Formats the number expr1 like '#,###,###.##', rounded to expr2 decimal places. If expr2 is 0, the result has no decimal point or fractional part. expr2 also accept a user specified format. This is supposed to function like MySQL's FORMAT. Examples: > SELECT format_number(12332.123456, 4); 12,332.1235 > SELECT format_number(12332.123456, '##################.###'); 12332.123 Since: 1.5.0 format_string format_string(strfmt, obj, ...) - Returns a formatted string from printf-style format strings. Examples: > SELECT format_string(\"Hello World %d %s\", 100, \"days\"); Hello World 100 days Since: 1.5.0 from_csv from_csv(csvStr, schema[, options]) - Returns a struct value with the given csvStr and schema . Examples: > SELECT from_csv('1, 0.8', 'a INT, b DOUBLE'); {\"a\":1,\"b\":0.8} > SELECT from_csv('26/08/2015', 'time Timestamp', map('timestampFormat', 'dd/MM/yyyy')); {\"time\":2015-08-26 00:00:00} Since: 3.0.0 from_json from_json(jsonStr, schema[, options]) - Returns a struct value with the given jsonStr and schema . Examples: > SELECT from_json('{\"a\":1, \"b\":0.8}', 'a INT, b DOUBLE'); {\"a\":1,\"b\":0.8} > SELECT from_json('{\"time\":\"26/08/2015\"}', 'time Timestamp', map('timestampFormat', 'dd/MM/yyyy')); {\"time\":2015-08-26 00:00:00} Since: 2.2.0 from_unixtime from_unixtime(unix_time[, fmt]) - Returns unix_time in the specified fmt . Arguments: unix_time - UNIX Timestamp to be converted to the provided format. fmt - Date/time format pattern to follow. See Datetime Patterns for valid date and time format patterns. The 'yyyy-MM-dd HH:mm:ss' pattern is used if omitted. Examples: > SELECT from_unixtime(0, 'yyyy-MM-dd HH:mm:ss'); 1969-12-31 16:00:00 > SELECT from_unixtime(0); 1969-12-31 16:00:00 Since: 1.5.0 from_utc_timestamp from_utc_timestamp(timestamp, timezone) - Given a timestamp like '2017-07-14 02:40:00.0', interprets it as a time in UTC, and renders that time as a timestamp in the given time zone. For example, 'GMT+1' would yield '2017-07-14 03:40:00.0'. Examples: > SELECT from_utc_timestamp('2016-08-31', 'Asia/Seoul'); 2016-08-31 09:00:00 Since: 1.5.0 get_json_object get_json_object(json_txt, path) - Extracts a json object from path . Examples: > SELECT get_json_object('{\"a\":\"b\"}', '$.a'); b Since: 1.5.0 greatest greatest(expr, ...) - Returns the greatest value of all parameters, skipping null values. Examples: > SELECT greatest(10, 9, 2, 4, 3); 10 Since: 1.5.0 grouping grouping(col) - indicates whether a specified column in a GROUP BY is aggregated or not, returns 1 for aggregated or 0 for not aggregated in the result set.\", Examples: > SELECT name, grouping(name), sum(age) FROM VALUES (2, 'Alice'), (5, 'Bob') people(age, name) GROUP BY cube(name); Alice 0 2 Bob 0 5 NULL 1 7 Since: 2.0.0 grouping_id grouping_id([col1[, col2 ..]]) - returns the level of grouping, equals to (grouping(c1) << (n-1)) + (grouping(c2) << (n-2)) + ... + grouping(cn) Examples: > SELECT name, grouping_id(), sum(age), avg(height) FROM VALUES (2, 'Alice', 165), (5, 'Bob', 180) people(age, name, height) GROUP BY cube(name, height); Alice 0 2 165.0 Alice 1 2 165.0 NULL 3 7 172.5 Bob 0 5 180.0 Bob 1 5 180.0 NULL 2 2 165.0 NULL 2 5 180.0 Note: Input columns should match with grouping columns exactly, or empty (means all the grouping columns). Since: 2.0.0 hash hash(expr1, expr2, ...) - Returns a hash value of the arguments. Examples: > SELECT hash('Spark', array(123), 2); -1321691492 Since: 2.0.0 hex hex(expr) - Converts expr to hexadecimal. Examples: > SELECT hex(17); 11 > SELECT hex('Spark SQL'); 537061726B2053514C Since: 1.5.0 hour hour(timestamp) - Returns the hour component of the string/timestamp. Examples: > SELECT hour('2009-07-30 12:58:59'); 12 Since: 1.5.0 hypot hypot(expr1, expr2) - Returns sqrt( expr1 2 + expr2 2). Examples: > SELECT hypot(3, 4); 5.0 Since: 1.4.0 if if(expr1, expr2, expr3) - If expr1 evaluates to true, then returns expr2 ; otherwise returns expr3 . Examples: > SELECT if(1 < 2, 'a', 'b'); a Since: 1.0.0 ifnull ifnull(expr1, expr2) - Returns expr2 if expr1 is null, or expr1 otherwise. Examples: > SELECT ifnull(NULL, array('2')); [\"2\"] Since: 2.0.0 in expr1 in(expr2, expr3, ...) - Returns true if expr equals to any valN. Arguments: expr1, expr2, expr3, ... - the arguments must be same type. Examples: > SELECT 1 in(1, 2, 3); true > SELECT 1 in(2, 3, 4); false > SELECT named_struct('a', 1, 'b', 2) in(named_struct('a', 1, 'b', 1), named_struct('a', 1, 'b', 3)); false > SELECT named_struct('a', 1, 'b', 2) in(named_struct('a', 1, 'b', 2), named_struct('a', 1, 'b', 3)); true Since: 1.0.0 initcap initcap(str) - Returns str with the first letter of each word in uppercase. All other letters are in lowercase. Words are delimited by white space. Examples: > SELECT initcap('sPark sql'); Spark Sql Since: 1.5.0 inline inline(expr) - Explodes an array of structs into a table. Uses column names col1, col2, etc. by default unless specified otherwise. Examples: > SELECT inline(array(struct(1, 'a'), struct(2, 'b'))); 1 a 2 b Since: 2.0.0 inline_outer inline_outer(expr) - Explodes an array of structs into a table. Uses column names col1, col2, etc. by default unless specified otherwise. Examples: > SELECT inline_outer(array(struct(1, 'a'), struct(2, 'b'))); 1 a 2 b Since: 2.0.0 input_file_block_length input_file_block_length() - Returns the length of the block being read, or -1 if not available. Examples: > SELECT input_file_block_length(); -1 Since: 2.2.0 input_file_block_start input_file_block_start() - Returns the start offset of the block being read, or -1 if not available. Examples: > SELECT input_file_block_start(); -1 Since: 2.2.0 input_file_name input_file_name() - Returns the name of the file being read, or empty string if not available. Examples: > SELECT input_file_name(); Since: 1.5.0 instr instr(str, substr) - Returns the (1-based) index of the first occurrence of substr in str . Examples: > SELECT instr('SparkSQL', 'SQL'); 6 Since: 1.5.0 int int(expr) - Casts the value expr to the target data type int . Since: 2.0.1 isnan isnan(expr) - Returns true if expr is NaN, or false otherwise. Examples: > SELECT isnan(cast('NaN' as double)); true Since: 1.5.0 isnotnull isnotnull(expr) - Returns true if expr is not null, or false otherwise. Examples: > SELECT isnotnull(1); true Since: 1.0.0 isnull isnull(expr) - Returns true if expr is null, or false otherwise. Examples: > SELECT isnull(1); false Since: 1.0.0 java_method java_method(class, method[, arg1[, arg2 ..]]) - Calls a method with reflection. Examples: > SELECT java_method('java.util.UUID', 'randomUUID'); c33fb387-8500-4bfa-81d2-6e0e3e930df2 > SELECT java_method('java.util.UUID', 'fromString', 'a5cf6c42-0c85-418f-af6c-3e4e5b1328f2'); a5cf6c42-0c85-418f-af6c-3e4e5b1328f2 Since: 2.0.0 json_array_length json_array_length(jsonArray) - Returns the number of elements in the outmost JSON array. Arguments: jsonArray - A JSON array. NULL is returned in case of any other valid JSON string, NULL or an invalid JSON. Examples: > SELECT json_array_length('[1,2,3,4]'); 4 > SELECT json_array_length('[1,2,3,{\"f1\":1,\"f2\":[5,6]},4]'); 5 > SELECT json_array_length('[1,2'); NULL Since: 3.1.0 json_object_keys json_object_keys(json_object) - Returns all the keys of the outmost JSON object as an array. Arguments: json_object - A JSON object. If a valid JSON object is given, all the keys of the outmost object will be returned as an array. If it is any other valid JSON string, an invalid JSON string or an empty string, the function returns null. Examples: > SELECT json_object_keys('{}'); [] > SELECT json_object_keys('{\"key\": \"value\"}'); [\"key\"] > SELECT json_object_keys('{\"f1\":\"abc\",\"f2\":{\"f3\":\"a\", \"f4\":\"b\"}}'); [\"f1\",\"f2\"] Since: 3.1.0 json_tuple json_tuple(jsonStr, p1, p2, ..., pn) - Returns a tuple like the function get_json_object, but it takes multiple names. All the input parameters and output column types are string. Examples: > SELECT json_tuple('{\"a\":1, \"b\":2}', 'a', 'b'); 1 2 Since: 1.6.0 kurtosis kurtosis(expr) - Returns the kurtosis value calculated from values of a group. Examples: > SELECT kurtosis(col) FROM VALUES (-10), (-20), (100), (1000) AS tab(col); -0.7014368047529627 > SELECT kurtosis(col) FROM VALUES (1), (10), (100), (10), (1) as tab(col); 0.19432323191699075 Since: 1.6.0 lag lag(input[, offset[, default]]) - Returns the value of input at the offset th row before the current row in the window. The default value of offset is 1 and the default value of default is null. If the value of input at the offset th row is null, null is returned. If there is no such offset row (e.g., when the offset is 1, the first row of the window does not have any previous row), default is returned. Arguments: input - a string expression to evaluate offset rows before the current row. offset - an int expression which is rows to jump back in the partition. default - a string expression which is to use when the offset row does not exist. Examples: > SELECT a, b, lag(b) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 NULL A1 1 1 A1 2 1 A2 3 NULL Since: 2.0.0 last last(expr[, isIgnoreNull]) - Returns the last value of expr for a group of rows. If isIgnoreNull is true, returns only non-null values Examples: > SELECT last(col) FROM VALUES (10), (5), (20) AS tab(col); 20 > SELECT last(col) FROM VALUES (10), (5), (NULL) AS tab(col); NULL > SELECT last(col, true) FROM VALUES (10), (5), (NULL) AS tab(col); 5 Note: The function is non-deterministic because its results depends on the order of the rows which may be non-deterministic after a shuffle. Since: 2.0.0 last_day last_day(date) - Returns the last day of the month which the date belongs to. Examples: > SELECT last_day('2009-01-12'); 2009-01-31 Since: 1.5.0 last_value last_value(expr[, isIgnoreNull]) - Returns the last value of expr for a group of rows. If isIgnoreNull is true, returns only non-null values Examples: > SELECT last_value(col) FROM VALUES (10), (5), (20) AS tab(col); 20 > SELECT last_value(col) FROM VALUES (10), (5), (NULL) AS tab(col); NULL > SELECT last_value(col, true) FROM VALUES (10), (5), (NULL) AS tab(col); 5 Note: The function is non-deterministic because its results depends on the order of the rows which may be non-deterministic after a shuffle. Since: 2.0.0 lcase lcase(str) - Returns str with all characters changed to lowercase. Examples: > SELECT lcase('SparkSql'); sparksql Since: 1.0.1 lead lead(input[, offset[, default]]) - Returns the value of input at the offset th row after the current row in the window. The default value of offset is 1 and the default value of default is null. If the value of input at the offset th row is null, null is returned. If there is no such an offset row (e.g., when the offset is 1, the last row of the window does not have any subsequent row), default is returned. Arguments: input - a string expression to evaluate offset rows after the current row. offset - an int expression which is rows to jump ahead in the partition. default - a string expression which is to use when the offset is larger than the window. The default value is null. Examples: > SELECT a, b, lead(b) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 1 A1 1 2 A1 2 NULL A2 3 NULL Since: 2.0.0 least least(expr, ...) - Returns the least value of all parameters, skipping null values. Examples: > SELECT least(10, 9, 2, 4, 3); 2 Since: 1.5.0 left left(str, len) - Returns the leftmost len ( len can be string type) characters from the string str ,if len is less or equal than 0 the result is an empty string. Examples: > SELECT left('Spark SQL', 3); Spa Since: 2.3.0 length length(expr) - Returns the character length of string data or number of bytes of binary data. The length of string data includes the trailing spaces. The length of binary data includes binary zeros. Examples: > SELECT length('Spark SQL '); 10 > SELECT CHAR_LENGTH('Spark SQL '); 10 > SELECT CHARACTER_LENGTH('Spark SQL '); 10 Since: 1.5.0 levenshtein levenshtein(str1, str2) - Returns the Levenshtein distance between the two given strings. Examples: > SELECT levenshtein('kitten', 'sitting'); 3 Since: 1.5.0 like str like pattern[ ESCAPE escape] - Returns true if str matches pattern with escape , null if any arguments are null, false otherwise. Arguments: str - a string expression pattern - a string expression. The pattern is a string which is matched literally, with exception to the following special symbols: _ matches any one character in the input (similar to . in posix regular expressions) % matches zero or more characters in the input (similar to .* in posix regular expressions) Since Spark 2.0, string literals are unescaped in our SQL parser. For example, in order to match \"\\abc\", the pattern should be \"\\abc\". When SQL config 'spark.sql.parser.escapedStringLiterals' is enabled, it fallbacks to Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the pattern to match \"\\abc\" should be \"\\abc\". * escape - an character added since Spark 3.0. The default escape character is the '\\'. If an escape character precedes a special symbol or another escape character, the following character is matched literally. It is invalid to escape any other character. Examples: > SELECT like('Spark', '_park'); true > SET spark.sql.parser.escapedStringLiterals=true; spark.sql.parser.escapedStringLiterals true > SELECT '%SystemDrive%\\Users\\John' like '\\%SystemDrive\\%\\\\Users%'; true > SET spark.sql.parser.escapedStringLiterals=false; spark.sql.parser.escapedStringLiterals false > SELECT '%SystemDrive%\\\\Users\\\\John' like '\\%SystemDrive\\%\\\\\\\\Users%'; true > SELECT '%SystemDrive%/Users/John' like '/%SystemDrive/%//Users%' ESCAPE '/'; true Note: Use RLIKE to match with standard regular expressions. Since: 1.0.0 ln ln(expr) - Returns the natural logarithm (base e) of expr . Examples: > SELECT ln(1); 0.0 Since: 1.4.0 locate locate(substr, str[, pos]) - Returns the position of the first occurrence of substr in str after position pos . The given pos and return value are 1-based. Examples: > SELECT locate('bar', 'foobarbar'); 4 > SELECT locate('bar', 'foobarbar', 5); 7 > SELECT POSITION('bar' IN 'foobarbar'); 4 Since: 1.5.0 log log(base, expr) - Returns the logarithm of expr with base . Examples: > SELECT log(10, 100); 2.0 Since: 1.5.0 log10 log10(expr) - Returns the logarithm of expr with base 10. Examples: > SELECT log10(10); 1.0 Since: 1.4.0 log1p log1p(expr) - Returns log(1 + expr ). Examples: > SELECT log1p(0); 0.0 Since: 1.4.0 log2 log2(expr) - Returns the logarithm of expr with base 2. Examples: > SELECT log2(2); 1.0 Since: 1.4.0 lower lower(str) - Returns str with all characters changed to lowercase. Examples: > SELECT lower('SparkSql'); sparksql Since: 1.0.1 lpad lpad(str, len[, pad]) - Returns str , left-padded with pad to a length of len . If str is longer than len , the return value is shortened to len characters. If pad is not specified, str will be padded to the left with space characters. Examples: > SELECT lpad('hi', 5, '??'); ???hi > SELECT lpad('hi', 1, '??'); h > SELECT lpad('hi', 5); hi Since: 1.5.0 ltrim ltrim(str) - Removes the leading space characters from str . Arguments: str - a string expression trimStr - the trim string characters to trim, the default value is a single space Examples: > SELECT ltrim(' SparkSQL '); SparkSQL Since: 1.5.0 make_date make_date(year, month, day) - Create date from year, month and day fields. Arguments: year - the year to represent, from 1 to 9999 month - the month-of-year to represent, from 1 (January) to 12 (December) day - the day-of-month to represent, from 1 to 31 Examples: > SELECT make_date(2013, 7, 15); 2013-07-15 > SELECT make_date(2019, 13, 1); NULL > SELECT make_date(2019, 7, NULL); NULL > SELECT make_date(2019, 2, 30); NULL Since: 3.0.0 make_interval make_interval(years, months, weeks, days, hours, mins, secs) - Make interval from years, months, weeks, days, hours, mins and secs. Arguments: years - the number of years, positive or negative months - the number of months, positive or negative weeks - the number of weeks, positive or negative days - the number of days, positive or negative hours - the number of hours, positive or negative mins - the number of minutes, positive or negative secs - the number of seconds with the fractional part in microsecond precision. Examples: > SELECT make_interval(100, 11, 1, 1, 12, 30, 01.001001); 100 years 11 months 8 days 12 hours 30 minutes 1.001001 seconds > SELECT make_interval(100, null, 3); NULL > SELECT make_interval(0, 1, 0, 1, 0, 0, 100.000001); 1 months 1 days 1 minutes 40.000001 seconds Since: 3.0.0 make_timestamp make_timestamp(year, month, day, hour, min, sec[, timezone]) - Create timestamp from year, month, day, hour, min, sec and timezone fields. Arguments: year - the year to represent, from 1 to 9999 month - the month-of-year to represent, from 1 (January) to 12 (December) day - the day-of-month to represent, from 1 to 31 hour - the hour-of-day to represent, from 0 to 23 min - the minute-of-hour to represent, from 0 to 59 sec - the second-of-minute and its micro-fraction to represent, from 0 to 60. If the sec argument equals to 60, the seconds field is set to 0 and 1 minute is added to the final timestamp. timezone - the time zone identifier. For example, CET, UTC and etc. Examples: > SELECT make_timestamp(2014, 12, 28, 6, 30, 45.887); 2014-12-28 06:30:45.887 > SELECT make_timestamp(2014, 12, 28, 6, 30, 45.887, 'CET'); 2014-12-27 21:30:45.887 > SELECT make_timestamp(2019, 6, 30, 23, 59, 60); 2019-07-01 00:00:00 > SELECT make_timestamp(2019, 13, 1, 10, 11, 12, 'PST'); NULL > SELECT make_timestamp(null, 7, 22, 15, 30, 0); NULL Since: 3.0.0 map map(key0, value0, key1, value1, ...) - Creates a map with the given key/value pairs. Examples: > SELECT map(1.0, '2', 3.0, '4'); {1.0:\"2\",3.0:\"4\"} Since: 2.0.0 map_concat map_concat(map, ...) - Returns the union of all the given maps Examples: > SELECT map_concat(map(1, 'a', 2, 'b'), map(3, 'c')); {1:\"a\",2:\"b\",3:\"c\"} Since: 2.4.0 map_entries map_entries(map) - Returns an unordered array of all entries in the given map. Examples: > SELECT map_entries(map(1, 'a', 2, 'b')); [{\"key\":1,\"value\":\"a\"},{\"key\":2,\"value\":\"b\"}] Since: 3.0.0 map_filter map_filter(expr, func) - Filters entries in a map using the function. Examples: > SELECT map_filter(map(1, 0, 2, 2, 3, -1), (k, v) -> k > v); {1:0,3:-1} Since: 3.0.0 map_from_arrays map_from_arrays(keys, values) - Creates a map with a pair of the given key/value arrays. All elements in keys should not be null Examples: > SELECT map_from_arrays(array(1.0, 3.0), array('2', '4')); {1.0:\"2\",3.0:\"4\"} Since: 2.4.0 map_from_entries map_from_entries(arrayOfEntries) - Returns a map created from the given array of entries. Examples: > SELECT map_from_entries(array(struct(1, 'a'), struct(2, 'b'))); {1:\"a\",2:\"b\"} Since: 2.4.0 map_keys map_keys(map) - Returns an unordered array containing the keys of the map. Examples: > SELECT map_keys(map(1, 'a', 2, 'b')); [1,2] Since: 2.0.0 map_values map_values(map) - Returns an unordered array containing the values of the map. Examples: > SELECT map_values(map(1, 'a', 2, 'b')); [\"a\",\"b\"] Since: 2.0.0 map_zip_with map_zip_with(map1, map2, function) - Merges two given maps into a single map by applying function to the pair of values with the same key. For keys only presented in one map, NULL will be passed as the value for the missing key. If an input map contains duplicated keys, only the first entry of the duplicated key is passed into the lambda function. Examples: > SELECT map_zip_with(map(1, 'a', 2, 'b'), map(1, 'x', 2, 'y'), (k, v1, v2) -> concat(v1, v2)); {1:\"ax\",2:\"by\"} Since: 3.0.0 max max(expr) - Returns the maximum value of expr . Examples: > SELECT max(col) FROM VALUES (10), (50), (20) AS tab(col); 50 Since: 1.0.0 max_by max_by(x, y) - Returns the value of x associated with the maximum value of y . Examples: > SELECT max_by(x, y) FROM VALUES (('a', 10)), (('b', 50)), (('c', 20)) AS tab(x, y); b Since: 3.0.0 md5 md5(expr) - Returns an MD5 128-bit checksum as a hex string of expr . Examples: > SELECT md5('Spark'); 8cde774d6f7333752ed72cacddb05126 Since: 1.5.0 mean mean(expr) - Returns the mean calculated from values of a group. Examples: > SELECT mean(col) FROM VALUES (1), (2), (3) AS tab(col); 2.0 > SELECT mean(col) FROM VALUES (1), (2), (NULL) AS tab(col); 1.5 Since: 1.0.0 min min(expr) - Returns the minimum value of expr . Examples: > SELECT min(col) FROM VALUES (10), (-1), (20) AS tab(col); -1 Since: 1.0.0 min_by min_by(x, y) - Returns the value of x associated with the minimum value of y . Examples: > SELECT min_by(x, y) FROM VALUES (('a', 10)), (('b', 50)), (('c', 20)) AS tab(x, y); a Since: 3.0.0 minute minute(timestamp) - Returns the minute component of the string/timestamp. Examples: > SELECT minute('2009-07-30 12:58:59'); 58 Since: 1.5.0 mod expr1 mod expr2 - Returns the remainder after expr1 / expr2 . Examples: > SELECT 2 % 1.8; 0.2 > SELECT MOD(2, 1.8); 0.2 Since: 1.0.0 monotonically_increasing_id monotonically_increasing_id() - Returns monotonically increasing 64-bit integers. The generated ID is guaranteed to be monotonically increasing and unique, but not consecutive. The current implementation puts the partition ID in the upper 31 bits, and the lower 33 bits represent the record number within each partition. The assumption is that the data frame has less than 1 billion partitions, and each partition has less than 8 billion records. The function is non-deterministic because its result depends on partition IDs. Examples: > SELECT monotonically_increasing_id(); 0 Since: 1.4.0 month month(date) - Returns the month component of the date/timestamp. Examples: > SELECT month('2016-07-30'); 7 Since: 1.5.0 months_between months_between(timestamp1, timestamp2[, roundOff]) - If timestamp1 is later than timestamp2 , then the result is positive. If timestamp1 and timestamp2 are on the same day of month, or both are the last day of month, time of day will be ignored. Otherwise, the difference is calculated based on 31 days per month, and rounded to 8 digits unless roundOff=false. Examples: > SELECT months_between('1997-02-28 10:30:00', '1996-10-30'); 3.94959677 > SELECT months_between('1997-02-28 10:30:00', '1996-10-30', false); 3.9495967741935485 Since: 1.5.0 named_struct named_struct(name1, val1, name2, val2, ...) - Creates a struct with the given field names and values. Examples: > SELECT named_struct(\"a\", 1, \"b\", 2, \"c\", 3); {\"a\":1,\"b\":2,\"c\":3} Since: 1.5.0 nanvl nanvl(expr1, expr2) - Returns expr1 if it's not NaN, or expr2 otherwise. Examples: > SELECT nanvl(cast('NaN' as double), 123); 123.0 Since: 1.5.0 negative negative(expr) - Returns the negated value of expr . Examples: > SELECT negative(1); -1 Since: 1.0.0 next_day next_day(start_date, day_of_week) - Returns the first date which is later than start_date and named as indicated. Examples: > SELECT next_day('2015-01-14', 'TU'); 2015-01-20 Since: 1.5.0 not not expr - Logical not. Examples: > SELECT not true; false > SELECT not false; true > SELECT not NULL; NULL Since: 1.0.0 now now() - Returns the current timestamp at the start of query evaluation. Examples: > SELECT now(); 2020-04-25 15:49:11.914 Since: 1.6.0 nth_value nth_value(input[, offset]) - Returns the value of input at the row that is the offset th row from beginning of the window frame. Offset starts at 1. If ignoreNulls=true, we will skip nulls when finding the offset th row. Otherwise, every row counts for the offset . If there is no such an offset th row (e.g., when the offset is 10, size of the window frame is less than 10), null is returned. Arguments: input - the target column or expression that the function operates on. offset - a positive int literal to indicate the offset in the window frame. It starts with 1. ignoreNulls - an optional specification that indicates the NthValue should skip null values in the determination of which row to use. Examples: > SELECT a, b, nth_value(b, 2) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 1 A1 1 1 A1 2 1 A2 3 NULL Since: 3.1.0 ntile ntile(n) - Divides the rows for each window partition into n buckets ranging from 1 to at most n . Arguments: buckets - an int expression which is number of buckets to divide the rows in. Default value is 1. Examples: > SELECT a, b, ntile(2) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 1 A1 1 1 A1 2 2 A2 3 1 Since: 2.0.0 nullif nullif(expr1, expr2) - Returns null if expr1 equals to expr2 , or expr1 otherwise. Examples: > SELECT nullif(2, 2); NULL Since: 2.0.0 nvl nvl(expr1, expr2) - Returns expr2 if expr1 is null, or expr1 otherwise. Examples: > SELECT nvl(NULL, array('2')); [\"2\"] Since: 2.0.0 nvl2 nvl2(expr1, expr2, expr3) - Returns expr2 if expr1 is not null, or expr3 otherwise. Examples: > SELECT nvl2(NULL, 2, 1); 1 Since: 2.0.0 octet_length octet_length(expr) - Returns the byte length of string data or number of bytes of binary data. Examples: > SELECT octet_length('Spark SQL'); 9 Since: 2.3.0 or expr1 or expr2 - Logical OR. Examples: > SELECT true or false; true > SELECT false or false; false > SELECT true or NULL; true > SELECT false or NULL; NULL Since: 1.0.0 overlay overlay(input, replace, pos[, len]) - Replace input with replace that starts at pos and is of length len . Examples: > SELECT overlay('Spark SQL' PLACING '_' FROM 6); Spark_SQL > SELECT overlay('Spark SQL' PLACING 'CORE' FROM 7); Spark CORE > SELECT overlay('Spark SQL' PLACING 'ANSI ' FROM 7 FOR 0); Spark ANSI SQL > SELECT overlay('Spark SQL' PLACING 'tructured' FROM 2 FOR 4); Structured SQL > SELECT overlay(encode('Spark SQL', 'utf-8') PLACING encode('_', 'utf-8') FROM 6); Spark_SQL > SELECT overlay(encode('Spark SQL', 'utf-8') PLACING encode('CORE', 'utf-8') FROM 7); Spark CORE > SELECT overlay(encode('Spark SQL', 'utf-8') PLACING encode('ANSI ', 'utf-8') FROM 7 FOR 0); Spark ANSI SQL > SELECT overlay(encode('Spark SQL', 'utf-8') PLACING encode('tructured', 'utf-8') FROM 2 FOR 4); Structured SQL Since: 3.0.0 parse_url parse_url(url, partToExtract[, key]) - Extracts a part from a URL. Examples: > SELECT parse_url('http://spark.apache.org/path?query=1', 'HOST'); spark.apache.org > SELECT parse_url('http://spark.apache.org/path?query=1', 'QUERY'); query=1 > SELECT parse_url('http://spark.apache.org/path?query=1', 'QUERY', 'query'); 1 Since: 2.0.0 percent_rank percent_rank() - Computes the percentage ranking of a value in a group of values. Arguments: children - this is to base the rank on; a change in the value of one the children will trigger a change in rank. This is an internal parameter and will be assigned by the Analyser. Examples: > SELECT a, b, percent_rank(b) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 0.0 A1 1 0.0 A1 2 1.0 A2 3 0.0 Since: 2.0.0 percentile percentile(col, percentage [, frequency]) - Returns the exact percentile value of numeric column col at the given percentage. The value of percentage must be between 0.0 and 1.0. The value of frequency should be positive integral percentile(col, array(percentage1 [, percentage2]...) [, frequency]) - Returns the exact percentile value array of numeric column col at the given percentage(s). Each value of the percentage array must be between 0.0 and 1.0. The value of frequency should be positive integral Examples: > SELECT percentile(col, 0.3) FROM VALUES (0), (10) AS tab(col); 3.0 > SELECT percentile(col, array(0.25, 0.75)) FROM VALUES (0), (10) AS tab(col); [2.5,7.5] Since: 2.1.0 percentile_approx percentile_approx(col, percentage [, accuracy]) - Returns the approximate percentile of the numeric column col which is the smallest value in the ordered col values (sorted from least to greatest) such that no more than percentage of col values is less than the value or equal to that value. The value of percentage must be between 0.0 and 1.0. The accuracy parameter (default: 10000) is a positive numeric literal which controls approximation accuracy at the cost of memory. Higher value of accuracy yields better accuracy, 1.0/accuracy is the relative error of the approximation. When percentage is an array, each value of the percentage array must be between 0.0 and 1.0. In this case, returns the approximate percentile array of column col at the given percentage array. Examples: > SELECT percentile_approx(col, array(0.5, 0.4, 0.1), 100) FROM VALUES (0), (1), (2), (10) AS tab(col); [1,1,0] > SELECT percentile_approx(col, 0.5, 100) FROM VALUES (0), (6), (7), (9), (10) AS tab(col); 7 Since: 2.1.0 pi pi() - Returns pi. Examples: > SELECT pi(); 3.141592653589793 Since: 1.5.0 pmod pmod(expr1, expr2) - Returns the positive value of expr1 mod expr2 . Examples: > SELECT pmod(10, 3); 1 > SELECT pmod(-10, 3); 2 Since: 1.5.0 posexplode posexplode(expr) - Separates the elements of array expr into multiple rows with positions, or the elements of map expr into multiple rows and columns with positions. Unless specified otherwise, uses the column name pos for position, col for elements of the array or key and value for elements of the map. Examples: > SELECT posexplode(array(10,20)); 0 10 1 20 Since: 2.0.0 posexplode_outer posexplode_outer(expr) - Separates the elements of array expr into multiple rows with positions, or the elements of map expr into multiple rows and columns with positions. Unless specified otherwise, uses the column name pos for position, col for elements of the array or key and value for elements of the map. Examples: > SELECT posexplode_outer(array(10,20)); 0 10 1 20 Since: 2.0.0 position position(substr, str[, pos]) - Returns the position of the first occurrence of substr in str after position pos . The given pos and return value are 1-based. Examples: > SELECT position('bar', 'foobarbar'); 4 > SELECT position('bar', 'foobarbar', 5); 7 > SELECT POSITION('bar' IN 'foobarbar'); 4 Since: 1.5.0 positive positive(expr) - Returns the value of expr . Examples: > SELECT positive(1); 1 Since: 1.5.0 pow pow(expr1, expr2) - Raises expr1 to the power of expr2 . Examples: > SELECT pow(2, 3); 8.0 Since: 1.4.0 power power(expr1, expr2) - Raises expr1 to the power of expr2 . Examples: > SELECT power(2, 3); 8.0 Since: 1.4.0 printf printf(strfmt, obj, ...) - Returns a formatted string from printf-style format strings. Examples: > SELECT printf(\"Hello World %d %s\", 100, \"days\"); Hello World 100 days Since: 1.5.0 quarter quarter(date) - Returns the quarter of the year for date, in the range 1 to 4. Examples: > SELECT quarter('2016-08-31'); 3 Since: 1.5.0 radians radians(expr) - Converts degrees to radians. Arguments: expr - angle in degrees Examples: > SELECT radians(180); 3.141592653589793 Since: 1.4.0 raise_error raise_error(expr) - Throws an exception with expr . Examples: > SELECT raise_error('custom error message'); java.lang.RuntimeException custom error message Since: 3.1.0 rand rand([seed]) - Returns a random value with independent and identically distributed (i.i.d.) uniformly distributed values in [0, 1). Examples: > SELECT rand(); 0.9629742951434543 > SELECT rand(0); 0.8446490682263027 > SELECT rand(null); 0.8446490682263027 Note: The function is non-deterministic in general case. Since: 1.5.0 randn randn([seed]) - Returns a random value with independent and identically distributed (i.i.d.) values drawn from the standard normal distribution. Examples: > SELECT randn(); -0.3254147983080288 > SELECT randn(0); 1.1164209726833079 > SELECT randn(null); 1.1164209726833079 Note: The function is non-deterministic in general case. Since: 1.5.0 random random([seed]) - Returns a random value with independent and identically distributed (i.i.d.) uniformly distributed values in [0, 1). Examples: > SELECT random(); 0.9629742951434543 > SELECT random(0); 0.8446490682263027 > SELECT random(null); 0.8446490682263027 Note: The function is non-deterministic in general case. Since: 1.5.0 rank rank() - Computes the rank of a value in a group of values. The result is one plus the number of rows preceding or equal to the current row in the ordering of the partition. The values will produce gaps in the sequence. Arguments: children - this is to base the rank on; a change in the value of one the children will trigger a change in rank. This is an internal parameter and will be assigned by the Analyser. Examples: > SELECT a, b, rank(b) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 1 A1 1 1 A1 2 3 A2 3 1 Since: 2.0.0 reflect reflect(class, method[, arg1[, arg2 ..]]) - Calls a method with reflection. Examples: > SELECT reflect('java.util.UUID', 'randomUUID'); c33fb387-8500-4bfa-81d2-6e0e3e930df2 > SELECT reflect('java.util.UUID', 'fromString', 'a5cf6c42-0c85-418f-af6c-3e4e5b1328f2'); a5cf6c42-0c85-418f-af6c-3e4e5b1328f2 Since: 2.0.0 regexp_extract regexp_extract(str, regexp[, idx]) - Extract the first string in the str that match the regexp expression and corresponding to the regex group index. Arguments: str - a string expression. regexp - a string representing a regular expression. The regex string should be a Java regular expression. Since Spark 2.0, string literals (including regex patterns) are unescaped in our SQL parser. For example, to match \"\\abc\", a regular expression for regexp can be \"^\\abc$\". There is a SQL config 'spark.sql.parser.escapedStringLiterals' that can be used to fallback to the Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the regexp that can match \"\\abc\" is \"^\\abc$\". * idx - an integer expression that representing the group index. The regex maybe contains multiple groups. idx indicates which regex group to extract. The group index should be non-negative. The minimum value of idx is 0, which means matching the entire regular expression. If idx is not specified, the default group index value is 1. The idx parameter is the Java regex Matcher group() method index. Examples: > SELECT regexp_extract('100-200', '(\\\\d+)-(\\\\d+)', 1); 100 Since: 1.5.0 regexp_extract_all regexp_extract_all(str, regexp[, idx]) - Extract all strings in the str that match the regexp expression and corresponding to the regex group index. Arguments: str - a string expression. regexp - a string representing a regular expression. The regex string should be a Java regular expression. Since Spark 2.0, string literals (including regex patterns) are unescaped in our SQL parser. For example, to match \"\\abc\", a regular expression for regexp can be \"^\\abc$\". There is a SQL config 'spark.sql.parser.escapedStringLiterals' that can be used to fallback to the Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the regexp that can match \"\\abc\" is \"^\\abc$\". * idx - an integer expression that representing the group index. The regex may contains multiple groups. idx indicates which regex group to extract. The group index should be non-negative. The minimum value of idx is 0, which means matching the entire regular expression. If idx is not specified, the default group index value is 1. The idx parameter is the Java regex Matcher group() method index. Examples: > SELECT regexp_extract_all('100-200, 300-400', '(\\\\d+)-(\\\\d+)', 1); [\"100\",\"300\"] Since: 3.1.0 regexp_replace regexp_replace(str, regexp, rep[, position]) - Replaces all substrings of str that match regexp with rep . Arguments: str - a string expression to search for a regular expression pattern match. regexp - a string representing a regular expression. The regex string should be a Java regular expression. Since Spark 2.0, string literals (including regex patterns) are unescaped in our SQL parser. For example, to match \"\\abc\", a regular expression for regexp can be \"^\\abc$\". There is a SQL config 'spark.sql.parser.escapedStringLiterals' that can be used to fallback to the Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the regexp that can match \"\\abc\" is \"^\\abc$\". * rep - a string expression to replace matched substrings. * position - a positive integer literal that indicates the position within str to begin searching. The default is 1. If position is greater than the number of characters in str , the result is str . Examples: > SELECT regexp_replace('100-200', '(\\\\d+)', 'num'); num-num Since: 1.5.0 repeat repeat(str, n) - Returns the string which repeats the given string value n times. Examples: > SELECT repeat('123', 2); 123123 Since: 1.5.0 replace replace(str, search[, replace]) - Replaces all occurrences of search with replace . Arguments: str - a string expression search - a string expression. If search is not found in str , str is returned unchanged. replace - a string expression. If replace is not specified or is an empty string, nothing replaces the string that is removed from str . Examples: > SELECT replace('ABCabc', 'abc', 'DEF'); ABCDEF Since: 2.3.0 reverse reverse(array) - Returns a reversed string or an array with reverse order of elements. Examples: > SELECT reverse('Spark SQL'); LQS krapS > SELECT reverse(array(2, 1, 4, 3)); [3,4,1,2] Note: Reverse logic for arrays is available since 2.4.0. Since: 1.5.0 right right(str, len) - Returns the rightmost len ( len can be string type) characters from the string str ,if len is less or equal than 0 the result is an empty string. Examples: > SELECT right('Spark SQL', 3); SQL Since: 2.3.0 rint rint(expr) - Returns the double value that is closest in value to the argument and is equal to a mathematical integer. Examples: > SELECT rint(12.3456); 12.0 Since: 1.4.0 rlike str rlike regexp - Returns true if str matches regexp , or false otherwise. Arguments: str - a string expression regexp - a string expression. The regex string should be a Java regular expression. Since Spark 2.0, string literals (including regex patterns) are unescaped in our SQL parser. For example, to match \"\\abc\", a regular expression for regexp can be \"^\\abc$\". There is a SQL config 'spark.sql.parser.escapedStringLiterals' that can be used to fallback to the Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the regexp that can match \"\\abc\" is \"^\\abc$\". Examples: > SET spark.sql.parser.escapedStringLiterals=true; spark.sql.parser.escapedStringLiterals true > SELECT '%SystemDrive%\\Users\\John' rlike '%SystemDrive%\\\\Users.*'; true > SET spark.sql.parser.escapedStringLiterals=false; spark.sql.parser.escapedStringLiterals false > SELECT '%SystemDrive%\\\\Users\\\\John' rlike '%SystemDrive%\\\\\\\\Users.*'; true Note: Use LIKE to match with simple string pattern. Since: 1.0.0 rollup rollup([col1[, col2 ..]]) - create a multi-dimensional rollup using the specified columns so that we can run aggregation on them. Examples: > SELECT name, age, count(*) FROM VALUES (2, 'Alice'), (5, 'Bob') people(age, name) GROUP BY rollup(name, age); Bob 5 1 Alice 2 1 Alice NULL 1 NULL NULL 2 Bob NULL 1 Since: 2.0.0 round round(expr, d) - Returns expr rounded to d decimal places using HALF_UP rounding mode. Examples: > SELECT round(2.5, 0); 3 Since: 1.5.0 row_number row_number() - Assigns a unique, sequential number to each row, starting with one, according to the ordering of rows within the window partition. Examples: > SELECT a, b, row_number() OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 1 A1 1 2 A1 2 3 A2 3 1 Since: 2.0.0 rpad rpad(str, len[, pad]) - Returns str , right-padded with pad to a length of len . If str is longer than len , the return value is shortened to len characters. If pad is not specified, str will be padded to the right with space characters. Examples: > SELECT rpad('hi', 5, '??'); hi??? > SELECT rpad('hi', 1, '??'); h > SELECT rpad('hi', 5); hi Since: 1.5.0 rtrim rtrim(str) - Removes the trailing space characters from str . Arguments: str - a string expression trimStr - the trim string characters to trim, the default value is a single space Examples: > SELECT rtrim(' SparkSQL '); SparkSQL Since: 1.5.0 schema_of_csv schema_of_csv(csv[, options]) - Returns schema in the DDL format of CSV string. Examples: > SELECT schema_of_csv('1,abc'); STRUCT<`_c0`: INT, `_c1`: STRING> Since: 3.0.0 schema_of_json schema_of_json(json[, options]) - Returns schema in the DDL format of JSON string. Examples: > SELECT schema_of_json('[{\"col\":0}]'); ARRAY<STRUCT<`col`: BIGINT>> > SELECT schema_of_json('[{\"col\":01}]', map('allowNumericLeadingZeros', 'true')); ARRAY<STRUCT<`col`: BIGINT>> Since: 2.4.0 second second(timestamp) - Returns the second component of the string/timestamp. Examples: > SELECT second('2009-07-30 12:58:59'); 59 Since: 1.5.0 sentences sentences(str[, lang, country]) - Splits str into an array of array of words. Examples: > SELECT sentences('Hi there! Good morning.'); [[\"Hi\",\"there\"],[\"Good\",\"morning\"]] Since: 2.0.0 sequence sequence(start, stop, step) - Generates an array of elements from start to stop (inclusive), incrementing by step. The type of the returned elements is the same as the type of argument expressions. Supported types are: byte, short, integer, long, date, timestamp. The start and stop expressions must resolve to the same type. If start and stop expressions resolve to the 'date' or 'timestamp' type then the step expression must resolve to the 'interval' type, otherwise to the same type as the start and stop expressions. Arguments: start - an expression. The start of the range. stop - an expression. The end the range (inclusive). step - an optional expression. The step of the range. By default step is 1 if start is less than or equal to stop, otherwise -1. For the temporal sequences it's 1 day and -1 day respectively. If start is greater than stop then the step must be negative, and vice versa. Examples: > SELECT sequence(1, 5); [1,2,3,4,5] > SELECT sequence(5, 1); [5,4,3,2,1] > SELECT sequence(to_date('2018-01-01'), to_date('2018-03-01'), interval 1 month); [2018-01-01,2018-02-01,2018-03-01] Since: 2.4.0 sha sha(expr) - Returns a sha1 hash value as a hex string of the expr . Examples: > SELECT sha('Spark'); 85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c Since: 1.5.0 sha1 sha1(expr) - Returns a sha1 hash value as a hex string of the expr . Examples: > SELECT sha1('Spark'); 85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c Since: 1.5.0 sha2 sha2(expr, bitLength) - Returns a checksum of SHA-2 family as a hex string of expr . SHA-224, SHA-256, SHA-384, and SHA-512 are supported. Bit length of 0 is equivalent to 256. Examples: > SELECT sha2('Spark', 256); 529bc3b07127ecb7e53a4dcf1991d9152c24537d919178022b2c42657f79a26b Since: 1.5.0 shiftleft shiftleft(base, expr) - Bitwise left shift. Examples: > SELECT shiftleft(2, 1); 4 Since: 1.5.0 shiftright shiftright(base, expr) - Bitwise (signed) right shift. Examples: > SELECT shiftright(4, 1); 2 Since: 1.5.0 shiftrightunsigned shiftrightunsigned(base, expr) - Bitwise unsigned right shift. Examples: > SELECT shiftrightunsigned(4, 1); 2 Since: 1.5.0 shuffle shuffle(array) - Returns a random permutation of the given array. Examples: > SELECT shuffle(array(1, 20, 3, 5)); [3,1,5,20] > SELECT shuffle(array(1, 20, null, 3)); [20,null,3,1] Note: The function is non-deterministic. Since: 2.4.0 sign sign(expr) - Returns -1.0, 0.0 or 1.0 as expr is negative, 0 or positive. Examples: > SELECT sign(40); 1.0 Since: 1.4.0 signum signum(expr) - Returns -1.0, 0.0 or 1.0 as expr is negative, 0 or positive. Examples: > SELECT signum(40); 1.0 Since: 1.4.0 sin sin(expr) - Returns the sine of expr , as if computed by java.lang.Math.sin . Arguments: expr - angle in radians Examples: > SELECT sin(0); 0.0 Since: 1.4.0 sinh sinh(expr) - Returns hyperbolic sine of expr , as if computed by java.lang.Math.sinh . Arguments: expr - hyperbolic angle Examples: > SELECT sinh(0); 0.0 Since: 1.4.0 size size(expr) - Returns the size of an array or a map. The function returns null for null input if spark.sql.legacy.sizeOfNull is set to false or spark.sql.ansi.enabled is set to true. Otherwise, the function returns -1 for null input. With the default settings, the function returns -1 for null input. Examples: > SELECT size(array('b', 'd', 'c', 'a')); 4 > SELECT size(map('a', 1, 'b', 2)); 2 > SELECT size(NULL); -1 Since: 1.5.0 skewness skewness(expr) - Returns the skewness value calculated from values of a group. Examples: > SELECT skewness(col) FROM VALUES (-10), (-20), (100), (1000) AS tab(col); 1.1135657469022011 > SELECT skewness(col) FROM VALUES (-1000), (-100), (10), (20) AS tab(col); -1.1135657469022011 Since: 1.6.0 slice slice(x, start, length) - Subsets array x starting from index start (array indices start at 1, or starting from the end if start is negative) with the specified length. Examples: > SELECT slice(array(1, 2, 3, 4), 2, 2); [2,3] > SELECT slice(array(1, 2, 3, 4), -2, 2); [3,4] Since: 2.4.0 smallint smallint(expr) - Casts the value expr to the target data type smallint . Since: 2.0.1 some some(expr) - Returns true if at least one value of expr is true. Examples: > SELECT some(col) FROM VALUES (true), (false), (false) AS tab(col); true > SELECT some(col) FROM VALUES (NULL), (true), (false) AS tab(col); true > SELECT some(col) FROM VALUES (false), (false), (NULL) AS tab(col); false Since: 3.0.0 sort_array sort_array(array[, ascendingOrder]) - Sorts the input array in ascending or descending order according to the natural ordering of the array elements. Null elements will be placed at the beginning of the returned array in ascending order or at the end of the returned array in descending order. Examples: > SELECT sort_array(array('b', 'd', null, 'c', 'a'), true); [null,\"a\",\"b\",\"c\",\"d\"] Since: 1.5.0 soundex soundex(str) - Returns Soundex code of the string. Examples: > SELECT soundex('Miller'); M460 Since: 1.5.0 space space(n) - Returns a string consisting of n spaces. Examples: > SELECT concat(space(2), '1'); 1 Since: 1.5.0 spark_partition_id spark_partition_id() - Returns the current partition id. Examples: > SELECT spark_partition_id(); 0 Since: 1.4.0 split split(str, regex, limit) - Splits str around occurrences that match regex and returns an array with a length of at most limit Arguments: str - a string expression to split. regex - a string representing a regular expression. The regex string should be a Java regular expression. limit - an integer expression which controls the number of times the regex is applied. limit > 0: The resulting array's length will not be more than limit , and the resulting array's last entry will contain all input beyond the last matched regex. limit <= 0: regex will be applied as many times as possible, and the resulting array can be of any size. Examples: > SELECT split('oneAtwoBthreeC', '[ABC]'); [\"one\",\"two\",\"three\",\"\"] > SELECT split('oneAtwoBthreeC', '[ABC]', -1); [\"one\",\"two\",\"three\",\"\"] > SELECT split('oneAtwoBthreeC', '[ABC]', 2); [\"one\",\"twoBthreeC\"] Since: 1.5.0 sqrt sqrt(expr) - Returns the square root of expr . Examples: > SELECT sqrt(4); 2.0 Since: 1.1.1 stack stack(n, expr1, ..., exprk) - Separates expr1 , ..., exprk into n rows. Uses column names col0, col1, etc. by default unless specified otherwise. Examples: > SELECT stack(2, 1, 2, 3); 1 2 3 NULL Since: 2.0.0 std std(expr) - Returns the sample standard deviation calculated from values of a group. Examples: > SELECT std(col) FROM VALUES (1), (2), (3) AS tab(col); 1.0 Since: 1.6.0 stddev stddev(expr) - Returns the sample standard deviation calculated from values of a group. Examples: > SELECT stddev(col) FROM VALUES (1), (2), (3) AS tab(col); 1.0 Since: 1.6.0 stddev_pop stddev_pop(expr) - Returns the population standard deviation calculated from values of a group. Examples: > SELECT stddev_pop(col) FROM VALUES (1), (2), (3) AS tab(col); 0.816496580927726 Since: 1.6.0 stddev_samp stddev_samp(expr) - Returns the sample standard deviation calculated from values of a group. Examples: > SELECT stddev_samp(col) FROM VALUES (1), (2), (3) AS tab(col); 1.0 Since: 1.6.0 str_to_map str_to_map(text[, pairDelim[, keyValueDelim]]) - Creates a map after splitting the text into key/value pairs using delimiters. Default delimiters are ',' for pairDelim and ':' for keyValueDelim . Both pairDelim and keyValueDelim are treated as regular expressions. Examples: > SELECT str_to_map('a:1,b:2,c:3', ',', ':'); {\"a\":\"1\",\"b\":\"2\",\"c\":\"3\"} > SELECT str_to_map('a'); {\"a\":null} Since: 2.0.1 string string(expr) - Casts the value expr to the target data type string . Since: 2.0.1 struct struct(col1, col2, col3, ...) - Creates a struct with the given field values. Examples: > SELECT struct(1, 2, 3); {\"col1\":1,\"col2\":2,\"col3\":3} Since: 1.4.0 substr substr(str, pos[, len]) - Returns the substring of str that starts at pos and is of length len , or the slice of byte array that starts at pos and is of length len . substr(str FROM pos[ FOR len]]) - Returns the substring of str that starts at pos and is of length len , or the slice of byte array that starts at pos and is of length len . Examples: > SELECT substr('Spark SQL', 5); k SQL > SELECT substr('Spark SQL', -3); SQL > SELECT substr('Spark SQL', 5, 1); k > SELECT substr('Spark SQL' FROM 5); k SQL > SELECT substr('Spark SQL' FROM -3); SQL > SELECT substr('Spark SQL' FROM 5 FOR 1); k Since: 1.5.0 substring substring(str, pos[, len]) - Returns the substring of str that starts at pos and is of length len , or the slice of byte array that starts at pos and is of length len . substring(str FROM pos[ FOR len]]) - Returns the substring of str that starts at pos and is of length len , or the slice of byte array that starts at pos and is of length len . Examples: > SELECT substring('Spark SQL', 5); k SQL > SELECT substring('Spark SQL', -3); SQL > SELECT substring('Spark SQL', 5, 1); k > SELECT substring('Spark SQL' FROM 5); k SQL > SELECT substring('Spark SQL' FROM -3); SQL > SELECT substring('Spark SQL' FROM 5 FOR 1); k Since: 1.5.0 substring_index substring_index(str, delim, count) - Returns the substring from str before count occurrences of the delimiter delim . If count is positive, everything to the left of the final delimiter (counting from the left) is returned. If count is negative, everything to the right of the final delimiter (counting from the right) is returned. The function substring_index performs a case-sensitive match when searching for delim . Examples: > SELECT substring_index('www.apache.org', '.', 2); www.apache Since: 1.5.0 sum sum(expr) - Returns the sum calculated from values of a group. Examples: > SELECT sum(col) FROM VALUES (5), (10), (15) AS tab(col); 30 > SELECT sum(col) FROM VALUES (NULL), (10), (15) AS tab(col); 25 > SELECT sum(col) FROM VALUES (NULL), (NULL) AS tab(col); NULL Since: 1.0.0 tan tan(expr) - Returns the tangent of expr , as if computed by java.lang.Math.tan . Arguments: expr - angle in radians Examples: > SELECT tan(0); 0.0 Since: 1.4.0 tanh tanh(expr) - Returns the hyperbolic tangent of expr , as if computed by java.lang.Math.tanh . Arguments: expr - hyperbolic angle Examples: > SELECT tanh(0); 0.0 Since: 1.4.0 timestamp timestamp(expr) - Casts the value expr to the target data type timestamp . Since: 2.0.1 timestamp_micros timestamp_micros(microseconds) - Creates timestamp from the number of microseconds since UTC epoch. Examples: > SELECT timestamp_micros(1230219000123123); 2008-12-25 07:30:00.123123 Since: 3.1.0 timestamp_millis timestamp_millis(milliseconds) - Creates timestamp from the number of milliseconds since UTC epoch. Examples: > SELECT timestamp_millis(1230219000123); 2008-12-25 07:30:00.123 Since: 3.1.0 timestamp_seconds timestamp_seconds(seconds) - Creates timestamp from the number of seconds (can be fractional) since UTC epoch. Examples: > SELECT timestamp_seconds(1230219000); 2008-12-25 07:30:00 > SELECT timestamp_seconds(1230219000.123); 2008-12-25 07:30:00.123 Since: 3.1.0 tinyint tinyint(expr) - Casts the value expr to the target data type tinyint . Since: 2.0.1 to_csv to_csv(expr[, options]) - Returns a CSV string with a given struct value Examples: > SELECT to_csv(named_struct('a', 1, 'b', 2)); 1,2 > SELECT to_csv(named_struct('time', to_timestamp('2015-08-26', 'yyyy-MM-dd')), map('timestampFormat', 'dd/MM/yyyy')); 26/08/2015 Since: 3.0.0 to_date to_date(date_str[, fmt]) - Parses the date_str expression with the fmt expression to a date. Returns null with invalid input. By default, it follows casting rules to a date if the fmt is omitted. Arguments: date_str - A string to be parsed to date. fmt - Date format pattern to follow. See Datetime Patterns for valid date and time format patterns. Examples: > SELECT to_date('2009-07-30 04:17:52'); 2009-07-30 > SELECT to_date('2016-12-31', 'yyyy-MM-dd'); 2016-12-31 Since: 1.5.0 to_json to_json(expr[, options]) - Returns a JSON string with a given struct value Examples: > SELECT to_json(named_struct('a', 1, 'b', 2)); {\"a\":1,\"b\":2} > SELECT to_json(named_struct('time', to_timestamp('2015-08-26', 'yyyy-MM-dd')), map('timestampFormat', 'dd/MM/yyyy')); {\"time\":\"26/08/2015\"} > SELECT to_json(array(named_struct('a', 1, 'b', 2))); [{\"a\":1,\"b\":2}] > SELECT to_json(map('a', named_struct('b', 1))); {\"a\":{\"b\":1}} > SELECT to_json(map(named_struct('a', 1),named_struct('b', 2))); {\"[1]\":{\"b\":2}} > SELECT to_json(map('a', 1)); {\"a\":1} > SELECT to_json(array((map('a', 1)))); [{\"a\":1}] Since: 2.2.0 to_timestamp to_timestamp(timestamp_str[, fmt]) - Parses the timestamp_str expression with the fmt expression to a timestamp. Returns null with invalid input. By default, it follows casting rules to a timestamp if the fmt is omitted. Arguments: timestamp_str - A string to be parsed to timestamp. fmt - Timestamp format pattern to follow. See Datetime Patterns for valid date and time format patterns. Examples: > SELECT to_timestamp('2016-12-31 00:12:00'); 2016-12-31 00:12:00 > SELECT to_timestamp('2016-12-31', 'yyyy-MM-dd'); 2016-12-31 00:00:00 Since: 2.2.0 to_unix_timestamp to_unix_timestamp(timeExp[, fmt]) - Returns the UNIX timestamp of the given time. Arguments: timeExp - A date/timestamp or string which is returned as a UNIX timestamp. fmt - Date/time format pattern to follow. Ignored if timeExp is not a string. Default value is \"yyyy-MM-dd HH:mm:ss\". See Datetime Patterns for valid date and time format patterns. Examples: > SELECT to_unix_timestamp('2016-04-08', 'yyyy-MM-dd'); 1460098800 Since: 1.6.0 to_utc_timestamp to_utc_timestamp(timestamp, timezone) - Given a timestamp like '2017-07-14 02:40:00.0', interprets it as a time in the given time zone, and renders that time as a timestamp in UTC. For example, 'GMT+1' would yield '2017-07-14 01:40:00.0'. Examples: > SELECT to_utc_timestamp('2016-08-31', 'Asia/Seoul'); 2016-08-30 15:00:00 Since: 1.5.0 transform transform(expr, func) - Transforms elements in an array using the function. Examples: > SELECT transform(array(1, 2, 3), x -> x + 1); [2,3,4] > SELECT transform(array(1, 2, 3), (x, i) -> x + i); [1,3,5] Since: 2.4.0 transform_keys transform_keys(expr, func) - Transforms elements in a map using the function. Examples: > SELECT transform_keys(map_from_arrays(array(1, 2, 3), array(1, 2, 3)), (k, v) -> k + 1); {2:1,3:2,4:3} > SELECT transform_keys(map_from_arrays(array(1, 2, 3), array(1, 2, 3)), (k, v) -> k + v); {2:1,4:2,6:3} Since: 3.0.0 transform_values transform_values(expr, func) - Transforms values in the map using the function. Examples: > SELECT transform_values(map_from_arrays(array(1, 2, 3), array(1, 2, 3)), (k, v) -> v + 1); {1:2,2:3,3:4} > SELECT transform_values(map_from_arrays(array(1, 2, 3), array(1, 2, 3)), (k, v) -> k + v); {1:2,2:4,3:6} Since: 3.0.0 translate translate(input, from, to) - Translates the input string by replacing the characters present in the from string with the corresponding characters in the to string. Examples: > SELECT translate('AaBbCc', 'abc', '123'); A1B2C3 Since: 1.5.0 trim trim(str) - Removes the leading and trailing space characters from str . trim(BOTH FROM str) - Removes the leading and trailing space characters from str . trim(LEADING FROM str) - Removes the leading space characters from str . trim(TRAILING FROM str) - Removes the trailing space characters from str . trim(trimStr FROM str) - Remove the leading and trailing trimStr characters from str . trim(BOTH trimStr FROM str) - Remove the leading and trailing trimStr characters from str . trim(LEADING trimStr FROM str) - Remove the leading trimStr characters from str . trim(TRAILING trimStr FROM str) - Remove the trailing trimStr characters from str . Arguments: str - a string expression trimStr - the trim string characters to trim, the default value is a single space BOTH, FROM - these are keywords to specify trimming string characters from both ends of the string LEADING, FROM - these are keywords to specify trimming string characters from the left end of the string TRAILING, FROM - these are keywords to specify trimming string characters from the right end of the string Examples: > SELECT trim(' SparkSQL '); SparkSQL > SELECT trim(BOTH FROM ' SparkSQL '); SparkSQL > SELECT trim(LEADING FROM ' SparkSQL '); SparkSQL > SELECT trim(TRAILING FROM ' SparkSQL '); SparkSQL > SELECT trim('SL' FROM 'SSparkSQLS'); parkSQ > SELECT trim(BOTH 'SL' FROM 'SSparkSQLS'); parkSQ > SELECT trim(LEADING 'SL' FROM 'SSparkSQLS'); parkSQLS > SELECT trim(TRAILING 'SL' FROM 'SSparkSQLS'); SSparkSQ Since: 1.5.0 trunc trunc(date, fmt) - Returns date with the time portion of the day truncated to the unit specified by the format model fmt . Arguments: date - date value or valid date string fmt - the format representing the unit to be truncated to \"YEAR\", \"YYYY\", \"YY\" - truncate to the first date of the year that the date falls in \"QUARTER\" - truncate to the first date of the quarter that the date falls in \"MONTH\", \"MM\", \"MON\" - truncate to the first date of the month that the date falls in \"WEEK\" - truncate to the Monday of the week that the date falls in Examples: > SELECT trunc('2019-08-04', 'week'); 2019-07-29 > SELECT trunc('2019-08-04', 'quarter'); 2019-07-01 > SELECT trunc('2009-02-12', 'MM'); 2009-02-01 > SELECT trunc('2015-10-27', 'YEAR'); 2015-01-01 Since: 1.5.0 typeof typeof(expr) - Return DDL-formatted type string for the data type of the input. Examples: > SELECT typeof(1); int > SELECT typeof(array(1)); array<int> Since: 3.0.0 ucase ucase(str) - Returns str with all characters changed to uppercase. Examples: > SELECT ucase('SparkSql'); SPARKSQL Since: 1.0.1 unbase64 unbase64(str) - Converts the argument from a base 64 string str to a binary. Examples: > SELECT unbase64('U3BhcmsgU1FM'); Spark SQL Since: 1.5.0 unhex unhex(expr) - Converts hexadecimal expr to binary. Examples: > SELECT decode(unhex('537061726B2053514C'), 'UTF-8'); Spark SQL Since: 1.5.0 unix_date unix_date(date) - Returns the number of days since 1970-01-01. Examples: > SELECT unix_date(DATE(\"1970-01-02\")); 1 Since: 3.1.0 unix_micros unix_micros(timestamp) - Returns the number of microseconds since 1970-01-01 00:00:00 UTC. Examples: > SELECT unix_micros(TIMESTAMP('1970-01-01 00:00:01Z')); 1000000 Since: 3.1.0 unix_millis unix_millis(timestamp) - Returns the number of milliseconds since 1970-01-01 00:00:00 UTC. Truncates higher levels of precision. Examples: > SELECT unix_millis(TIMESTAMP('1970-01-01 00:00:01Z')); 1000 Since: 3.1.0 unix_seconds unix_seconds(timestamp) - Returns the number of seconds since 1970-01-01 00:00:00 UTC. Truncates higher levels of precision. Examples: > SELECT unix_seconds(TIMESTAMP('1970-01-01 00:00:01Z')); 1 Since: 3.1.0 unix_timestamp unix_timestamp([timeExp[, fmt]]) - Returns the UNIX timestamp of current or specified time. Arguments: timeExp - A date/timestamp or string. If not provided, this defaults to current time. fmt - Date/time format pattern to follow. Ignored if timeExp is not a string. Default value is \"yyyy-MM-dd HH:mm:ss\". See Datetime Patterns for valid date and time format patterns. Examples: > SELECT unix_timestamp(); 1476884637 > SELECT unix_timestamp('2016-04-08', 'yyyy-MM-dd'); 1460041200 Since: 1.5.0 upper upper(str) - Returns str with all characters changed to uppercase. Examples: > SELECT upper('SparkSql'); SPARKSQL Since: 1.0.1 uuid uuid() - Returns an universally unique identifier (UUID) string. The value is returned as a canonical UUID 36-character string. Examples: > SELECT uuid(); 46707d92-02f4-4817-8116-a4c3b23e6266 Note: The function is non-deterministic. Since: 2.3.0 var_pop var_pop(expr) - Returns the population variance calculated from values of a group. Examples: > SELECT var_pop(col) FROM VALUES (1), (2), (3) AS tab(col); 0.6666666666666666 Since: 1.6.0 var_samp var_samp(expr) - Returns the sample variance calculated from values of a group. Examples: > SELECT var_samp(col) FROM VALUES (1), (2), (3) AS tab(col); 1.0 Since: 1.6.0 variance variance(expr) - Returns the sample variance calculated from values of a group. Examples: > SELECT variance(col) FROM VALUES (1), (2), (3) AS tab(col); 1.0 Since: 1.6.0 version version() - Returns the Spark version. The string contains 2 fields, the first being a release version and the second being a git revision. Examples: > SELECT version(); 3.1.0 a6d6ea3efedbad14d99c24143834cd4e2e52fb40 Since: 3.0.0 weekday weekday(date) - Returns the day of the week for date/timestamp (0 = Monday, 1 = Tuesday, ..., 6 = Sunday). Examples: > SELECT weekday('2009-07-30'); 3 Since: 2.4.0 weekofyear weekofyear(date) - Returns the week of the year of the given date. A week is considered to start on a Monday and week 1 is the first week with >3 days. Examples: > SELECT weekofyear('2008-02-20'); 8 Since: 1.5.0 when CASE WHEN expr1 THEN expr2 [WHEN expr3 THEN expr4]* [ELSE expr5] END - When expr1 = true, returns expr2 ; else when expr3 = true, returns expr4 ; else returns expr5 . Arguments: expr1, expr3 - the branch condition expressions should all be boolean type. expr2, expr4, expr5 - the branch value expressions and else value expression should all be same type or coercible to a common type. Examples: > SELECT CASE WHEN 1 > 0 THEN 1 WHEN 2 > 0 THEN 2.0 ELSE 1.2 END; 1.0 > SELECT CASE WHEN 1 < 0 THEN 1 WHEN 2 > 0 THEN 2.0 ELSE 1.2 END; 2.0 > SELECT CASE WHEN 1 < 0 THEN 1 WHEN 2 < 0 THEN 2.0 END; NULL Since: 1.0.1 width_bucket width_bucket(value, min_value, max_value, num_bucket) - Returns the bucket number to which value would be assigned in an equiwidth histogram with num_bucket buckets, in the range min_value to max_value .\" Examples: > SELECT width_bucket(5.3, 0.2, 10.6, 5); 3 > SELECT width_bucket(-2.1, 1.3, 3.4, 3); 0 > SELECT width_bucket(8.1, 0.0, 5.7, 4); 5 > SELECT width_bucket(-0.9, 5.2, 0.5, 2); 3 Since: 3.1.0 window N/A. xpath xpath(xml, xpath) - Returns a string array of values within the nodes of xml that match the XPath expression. Examples: > SELECT xpath('<a><b>b1</b><b>b2</b><b>b3</b><c>c1</c><c>c2</c></a>','a/b/text()'); [\"b1\",\"b2\",\"b3\"] Since: 2.0.0 xpath_boolean xpath_boolean(xml, xpath) - Returns true if the XPath expression evaluates to true, or if a matching node is found. Examples: > SELECT xpath_boolean('<a><b>1</b></a>','a/b'); true Since: 2.0.0 xpath_double xpath_double(xml, xpath) - Returns a double value, the value zero if no match is found, or NaN if a match is found but the value is non-numeric. Examples: > SELECT xpath_double('<a><b>1</b><b>2</b></a>', 'sum(a/b)'); 3.0 Since: 2.0.0 xpath_float xpath_float(xml, xpath) - Returns a float value, the value zero if no match is found, or NaN if a match is found but the value is non-numeric. Examples: > SELECT xpath_float('<a><b>1</b><b>2</b></a>', 'sum(a/b)'); 3.0 Since: 2.0.0 xpath_int xpath_int(xml, xpath) - Returns an integer value, or the value zero if no match is found, or a match is found but the value is non-numeric. Examples: > SELECT xpath_int('<a><b>1</b><b>2</b></a>', 'sum(a/b)'); 3 Since: 2.0.0 xpath_long xpath_long(xml, xpath) - Returns a long integer value, or the value zero if no match is found, or a match is found but the value is non-numeric. Examples: > SELECT xpath_long('<a><b>1</b><b>2</b></a>', 'sum(a/b)'); 3 Since: 2.0.0 xpath_number xpath_number(xml, xpath) - Returns a double value, the value zero if no match is found, or NaN if a match is found but the value is non-numeric. Examples: > SELECT xpath_number('<a><b>1</b><b>2</b></a>', 'sum(a/b)'); 3.0 Since: 2.0.0 xpath_short xpath_short(xml, xpath) - Returns a short integer value, or the value zero if no match is found, or a match is found but the value is non-numeric. Examples: > SELECT xpath_short('<a><b>1</b><b>2</b></a>', 'sum(a/b)'); 3 Since: 2.0.0 xpath_string xpath_string(xml, xpath) - Returns the text contents of the first xml node that matches the XPath expression. Examples: > SELECT xpath_string('<a><b>b</b><c>cc</c></a>','a/c'); cc Since: 2.0.0 xxhash64 xxhash64(expr1, expr2, ...) - Returns a 64-bit hash value of the arguments. Examples: > SELECT xxhash64('Spark', array(123), 2); 5602566077635097486 Since: 3.0.0 year year(date) - Returns the year component of the date/timestamp. Examples: > SELECT year('2016-07-30'); 2016 Since: 1.5.0 zip_with zip_with(left, right, func) - Merges the two given arrays, element-wise, into a single array using function. If one array is shorter, nulls are appended at the end to match the length of the longer array, before applying function. Examples: > SELECT zip_with(array(1, 2, 3), array('a', 'b', 'c'), (x, y) -> (y, x)); [{\"y\":\"a\",\"x\":1},{\"y\":\"b\",\"x\":2},{\"y\":\"c\",\"x\":3}] > SELECT zip_with(array(1, 2), array(3, 4), (x, y) -> x + y); [4,6] > SELECT zip_with(array('a', 'b', 'c'), array('d', 'e', 'f'), (x, y) -> concat(x, y)); [\"ad\",\"be\",\"cf\"] Since: 2.4.0 | expr1 | expr2 - Returns the result of bitwise OR of expr1 and expr2 . Examples: > SELECT 3 | 5; 7 Since: 1.4.0 ~ ~ expr - Returns the result of bitwise NOT of expr . Examples: > SELECT ~ 0; -1 Since: 1.4.0","title":"Functions"},{"location":"#built-in-functions","text":"","title":"Built-in Functions"},{"location":"#_1","text":"! expr - Logical not. Examples: > SELECT ! true; false > SELECT ! false; true > SELECT ! NULL; NULL Since: 1.0.0","title":"!"},{"location":"#_2","text":"expr1 % expr2 - Returns the remainder after expr1 / expr2 . Examples: > SELECT 2 % 1.8; 0.2 > SELECT MOD(2, 1.8); 0.2 Since: 1.0.0","title":"%"},{"location":"#_3","text":"expr1 & expr2 - Returns the result of bitwise AND of expr1 and expr2 . Examples: > SELECT 3 & 5; 1 Since: 1.4.0","title":"&amp;"},{"location":"#_4","text":"expr1 * expr2 - Returns expr1 * expr2 . Examples: > SELECT 2 * 3; 6 Since: 1.0.0","title":"*"},{"location":"#_5","text":"expr1 + expr2 - Returns expr1 + expr2 . Examples: > SELECT 1 + 2; 3 Since: 1.0.0","title":"+"},{"location":"#-","text":"expr1 - expr2 - Returns expr1 - expr2 . Examples: > SELECT 2 - 1; 1 Since: 1.0.0","title":"-"},{"location":"#_6","text":"expr1 / expr2 - Returns expr1 / expr2 . It always performs floating point division. Examples: > SELECT 3 / 2; 1.5 > SELECT 2L / 2L; 1.0 Since: 1.0.0","title":"/"},{"location":"#_7","text":"expr1 < expr2 - Returns true if expr1 is less than expr2 . Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be ordered. For example, map type is not orderable, so it is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 1 < 2; true > SELECT 1.1 < '1'; false > SELECT to_date('2009-07-30 04:17:52') < to_date('2009-07-30 04:17:52'); false > SELECT to_date('2009-07-30 04:17:52') < to_date('2009-08-01 04:17:52'); true > SELECT 1 < NULL; NULL Since: 1.0.0","title":"&lt;"},{"location":"#_8","text":"expr1 <= expr2 - Returns true if expr1 is less than or equal to expr2 . Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be ordered. For example, map type is not orderable, so it is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 2 <= 2; true > SELECT 1.0 <= '1'; true > SELECT to_date('2009-07-30 04:17:52') <= to_date('2009-07-30 04:17:52'); true > SELECT to_date('2009-07-30 04:17:52') <= to_date('2009-08-01 04:17:52'); true > SELECT 1 <= NULL; NULL Since: 1.0.0","title":"&lt;="},{"location":"#_9","text":"expr1 <=> expr2 - Returns same result as the EQUAL(=) operator for non-null operands, but returns true if both are null, false if one of the them is null. Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be used in equality comparison. Map type is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 2 <=> 2; true > SELECT 1 <=> '1'; true > SELECT true <=> NULL; false > SELECT NULL <=> NULL; true Since: 1.1.0","title":"&lt;=&gt;"},{"location":"#_10","text":"expr1 = expr2 - Returns true if expr1 equals expr2 , or false otherwise. Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be used in equality comparison. Map type is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 2 = 2; true > SELECT 1 = '1'; true > SELECT true = NULL; NULL > SELECT NULL = NULL; NULL Since: 1.0.0","title":"="},{"location":"#_11","text":"expr1 == expr2 - Returns true if expr1 equals expr2 , or false otherwise. Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be used in equality comparison. Map type is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 2 == 2; true > SELECT 1 == '1'; true > SELECT true == NULL; NULL > SELECT NULL == NULL; NULL Since: 1.0.0","title":"=="},{"location":"#_12","text":"expr1 > expr2 - Returns true if expr1 is greater than expr2 . Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be ordered. For example, map type is not orderable, so it is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 2 > 1; true > SELECT 2 > '1.1'; true > SELECT to_date('2009-07-30 04:17:52') > to_date('2009-07-30 04:17:52'); false > SELECT to_date('2009-07-30 04:17:52') > to_date('2009-08-01 04:17:52'); false > SELECT 1 > NULL; NULL Since: 1.0.0","title":"&gt;"},{"location":"#_13","text":"expr1 >= expr2 - Returns true if expr1 is greater than or equal to expr2 . Arguments: expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be ordered. For example, map type is not orderable, so it is not supported. For complex types such array/struct, the data types of fields must be orderable. Examples: > SELECT 2 >= 1; true > SELECT 2.0 >= '2.1'; false > SELECT to_date('2009-07-30 04:17:52') >= to_date('2009-07-30 04:17:52'); true > SELECT to_date('2009-07-30 04:17:52') >= to_date('2009-08-01 04:17:52'); false > SELECT 1 >= NULL; NULL Since: 1.0.0","title":"&gt;="},{"location":"#_14","text":"expr1 ^ expr2 - Returns the result of bitwise exclusive OR of expr1 and expr2 . Examples: > SELECT 3 ^ 5; 6 Since: 1.4.0","title":"^"},{"location":"#abs","text":"abs(expr) - Returns the absolute value of the numeric value. Examples: > SELECT abs(-1); 1 Since: 1.2.0","title":"abs"},{"location":"#acos","text":"acos(expr) - Returns the inverse cosine (a.k.a. arc cosine) of expr , as if computed by java.lang.Math.acos . Examples: > SELECT acos(1); 0.0 > SELECT acos(2); NaN Since: 1.4.0","title":"acos"},{"location":"#acosh","text":"acosh(expr) - Returns inverse hyperbolic cosine of expr . Examples: > SELECT acosh(1); 0.0 > SELECT acosh(0); NaN Since: 3.0.0","title":"acosh"},{"location":"#add_months","text":"add_months(start_date, num_months) - Returns the date that is num_months after start_date . Examples: > SELECT add_months('2016-08-31', 1); 2016-09-30 Since: 1.5.0","title":"add_months"},{"location":"#aggregate","text":"aggregate(expr, start, merge, finish) - Applies a binary operator to an initial state and all elements in the array, and reduces this to a single state. The final state is converted into the final result by applying a finish function. Examples: > SELECT aggregate(array(1, 2, 3), 0, (acc, x) -> acc + x); 6 > SELECT aggregate(array(1, 2, 3), 0, (acc, x) -> acc + x, acc -> acc * 10); 60 Since: 2.4.0","title":"aggregate"},{"location":"#and","text":"expr1 and expr2 - Logical AND. Examples: > SELECT true and true; true > SELECT true and false; false > SELECT true and NULL; NULL > SELECT false and NULL; false Since: 1.0.0","title":"and"},{"location":"#any","text":"any(expr) - Returns true if at least one value of expr is true. Examples: > SELECT any(col) FROM VALUES (true), (false), (false) AS tab(col); true > SELECT any(col) FROM VALUES (NULL), (true), (false) AS tab(col); true > SELECT any(col) FROM VALUES (false), (false), (NULL) AS tab(col); false Since: 3.0.0","title":"any"},{"location":"#approx_count_distinct","text":"approx_count_distinct(expr[, relativeSD]) - Returns the estimated cardinality by HyperLogLog++. relativeSD defines the maximum relative standard deviation allowed. Examples: > SELECT approx_count_distinct(col1) FROM VALUES (1), (1), (2), (2), (3) tab(col1); 3 Since: 1.6.0","title":"approx_count_distinct"},{"location":"#approx_percentile","text":"approx_percentile(col, percentage [, accuracy]) - Returns the approximate percentile of the numeric column col which is the smallest value in the ordered col values (sorted from least to greatest) such that no more than percentage of col values is less than the value or equal to that value. The value of percentage must be between 0.0 and 1.0. The accuracy parameter (default: 10000) is a positive numeric literal which controls approximation accuracy at the cost of memory. Higher value of accuracy yields better accuracy, 1.0/accuracy is the relative error of the approximation. When percentage is an array, each value of the percentage array must be between 0.0 and 1.0. In this case, returns the approximate percentile array of column col at the given percentage array. Examples: > SELECT approx_percentile(col, array(0.5, 0.4, 0.1), 100) FROM VALUES (0), (1), (2), (10) AS tab(col); [1,1,0] > SELECT approx_percentile(col, 0.5, 100) FROM VALUES (0), (6), (7), (9), (10) AS tab(col); 7 Since: 2.1.0","title":"approx_percentile"},{"location":"#array","text":"array(expr, ...) - Returns an array with the given elements. Examples: > SELECT array(1, 2, 3); [1,2,3] Since: 1.1.0","title":"array"},{"location":"#array_contains","text":"array_contains(array, value) - Returns true if the array contains the value. Examples: > SELECT array_contains(array(1, 2, 3), 2); true Since: 1.5.0","title":"array_contains"},{"location":"#array_distinct","text":"array_distinct(array) - Removes duplicate values from the array. Examples: > SELECT array_distinct(array(1, 2, 3, null, 3)); [1,2,3,null] Since: 2.4.0","title":"array_distinct"},{"location":"#array_except","text":"array_except(array1, array2) - Returns an array of the elements in array1 but not in array2, without duplicates. Examples: > SELECT array_except(array(1, 2, 3), array(1, 3, 5)); [2] Since: 2.4.0","title":"array_except"},{"location":"#array_intersect","text":"array_intersect(array1, array2) - Returns an array of the elements in the intersection of array1 and array2, without duplicates. Examples: > SELECT array_intersect(array(1, 2, 3), array(1, 3, 5)); [1,3] Since: 2.4.0","title":"array_intersect"},{"location":"#array_join","text":"array_join(array, delimiter[, nullReplacement]) - Concatenates the elements of the given array using the delimiter and an optional string to replace nulls. If no value is set for nullReplacement, any null value is filtered. Examples: > SELECT array_join(array('hello', 'world'), ' '); hello world > SELECT array_join(array('hello', null ,'world'), ' '); hello world > SELECT array_join(array('hello', null ,'world'), ' ', ','); hello , world Since: 2.4.0","title":"array_join"},{"location":"#array_max","text":"array_max(array) - Returns the maximum value in the array. NULL elements are skipped. Examples: > SELECT array_max(array(1, 20, null, 3)); 20 Since: 2.4.0","title":"array_max"},{"location":"#array_min","text":"array_min(array) - Returns the minimum value in the array. NULL elements are skipped. Examples: > SELECT array_min(array(1, 20, null, 3)); 1 Since: 2.4.0","title":"array_min"},{"location":"#array_position","text":"array_position(array, element) - Returns the (1-based) index of the first element of the array as long. Examples: > SELECT array_position(array(3, 2, 1), 1); 3 Since: 2.4.0","title":"array_position"},{"location":"#array_remove","text":"array_remove(array, element) - Remove all elements that equal to element from array. Examples: > SELECT array_remove(array(1, 2, 3, null, 3), 3); [1,2,null] Since: 2.4.0","title":"array_remove"},{"location":"#array_repeat","text":"array_repeat(element, count) - Returns the array containing element count times. Examples: > SELECT array_repeat('123', 2); [\"123\",\"123\"] Since: 2.4.0","title":"array_repeat"},{"location":"#array_sort","text":"array_sort(expr, func) - Sorts the input array. If func is omitted, sort in ascending order. The elements of the input array must be orderable. Null elements will be placed at the end of the returned array. Since 3.0.0 this function also sorts and returns the array based on the given comparator function. The comparator will take two arguments representing two elements of the array. It returns -1, 0, or 1 as the first element is less than, equal to, or greater than the second element. If the comparator function returns other values (including null), the function will fail and raise an error. Examples: > SELECT array_sort(array(5, 6, 1), (left, right) -> case when left < right then -1 when left > right then 1 else 0 end); [1,5,6] > SELECT array_sort(array('bc', 'ab', 'dc'), (left, right) -> case when left is null and right is null then 0 when left is null then -1 when right is null then 1 when left < right then 1 when left > right then -1 else 0 end); [\"dc\",\"bc\",\"ab\"] > SELECT array_sort(array('b', 'd', null, 'c', 'a')); [\"a\",\"b\",\"c\",\"d\",null] Since: 2.4.0","title":"array_sort"},{"location":"#array_union","text":"array_union(array1, array2) - Returns an array of the elements in the union of array1 and array2, without duplicates. Examples: > SELECT array_union(array(1, 2, 3), array(1, 3, 5)); [1,2,3,5] Since: 2.4.0","title":"array_union"},{"location":"#arrays_overlap","text":"arrays_overlap(a1, a2) - Returns true if a1 contains at least a non-null element present also in a2. If the arrays have no common element and they are both non-empty and either of them contains a null element null is returned, false otherwise. Examples: > SELECT arrays_overlap(array(1, 2, 3), array(3, 4, 5)); true Since: 2.4.0","title":"arrays_overlap"},{"location":"#arrays_zip","text":"arrays_zip(a1, a2, ...) - Returns a merged array of structs in which the N-th struct contains all N-th values of input arrays. Examples: > SELECT arrays_zip(array(1, 2, 3), array(2, 3, 4)); [{\"0\":1,\"1\":2},{\"0\":2,\"1\":3},{\"0\":3,\"1\":4}] > SELECT arrays_zip(array(1, 2), array(2, 3), array(3, 4)); [{\"0\":1,\"1\":2,\"2\":3},{\"0\":2,\"1\":3,\"2\":4}] Since: 2.4.0","title":"arrays_zip"},{"location":"#ascii","text":"ascii(str) - Returns the numeric value of the first character of str . Examples: > SELECT ascii('222'); 50 > SELECT ascii(2); 50 Since: 1.5.0","title":"ascii"},{"location":"#asin","text":"asin(expr) - Returns the inverse sine (a.k.a. arc sine) the arc sin of expr , as if computed by java.lang.Math.asin . Examples: > SELECT asin(0); 0.0 > SELECT asin(2); NaN Since: 1.4.0","title":"asin"},{"location":"#asinh","text":"asinh(expr) - Returns inverse hyperbolic sine of expr . Examples: > SELECT asinh(0); 0.0 Since: 3.0.0","title":"asinh"},{"location":"#assert_true","text":"assert_true(expr) - Throws an exception if expr is not true. Examples: > SELECT assert_true(0 < 1); NULL Since: 2.0.0","title":"assert_true"},{"location":"#atan","text":"atan(expr) - Returns the inverse tangent (a.k.a. arc tangent) of expr , as if computed by java.lang.Math.atan Examples: > SELECT atan(0); 0.0 Since: 1.4.0","title":"atan"},{"location":"#atan2","text":"atan2(exprY, exprX) - Returns the angle in radians between the positive x-axis of a plane and the point given by the coordinates ( exprX , exprY ), as if computed by java.lang.Math.atan2 . Arguments: exprY - coordinate on y-axis exprX - coordinate on x-axis Examples: > SELECT atan2(0, 0); 0.0 Since: 1.4.0","title":"atan2"},{"location":"#atanh","text":"atanh(expr) - Returns inverse hyperbolic tangent of expr . Examples: > SELECT atanh(0); 0.0 > SELECT atanh(2); NaN Since: 3.0.0","title":"atanh"},{"location":"#avg","text":"avg(expr) - Returns the mean calculated from values of a group. Examples: > SELECT avg(col) FROM VALUES (1), (2), (3) AS tab(col); 2.0 > SELECT avg(col) FROM VALUES (1), (2), (NULL) AS tab(col); 1.5 Since: 1.0.0","title":"avg"},{"location":"#base64","text":"base64(bin) - Converts the argument from a binary bin to a base 64 string. Examples: > SELECT base64('Spark SQL'); U3BhcmsgU1FM Since: 1.5.0","title":"base64"},{"location":"#bigint","text":"bigint(expr) - Casts the value expr to the target data type bigint . Since: 2.0.1","title":"bigint"},{"location":"#bin","text":"bin(expr) - Returns the string representation of the long value expr represented in binary. Examples: > SELECT bin(13); 1101 > SELECT bin(-13); 1111111111111111111111111111111111111111111111111111111111110011 > SELECT bin(13.3); 1101 Since: 1.5.0","title":"bin"},{"location":"#binary","text":"binary(expr) - Casts the value expr to the target data type binary . Since: 2.0.1","title":"binary"},{"location":"#bit_and","text":"bit_and(expr) - Returns the bitwise AND of all non-null input values, or null if none. Examples: > SELECT bit_and(col) FROM VALUES (3), (5) AS tab(col); 1 Since: 3.0.0","title":"bit_and"},{"location":"#bit_count","text":"bit_count(expr) - Returns the number of bits that are set in the argument expr as an unsigned 64-bit integer, or NULL if the argument is NULL. Examples: > SELECT bit_count(0); 0 Since: 3.0.0","title":"bit_count"},{"location":"#bit_length","text":"bit_length(expr) - Returns the bit length of string data or number of bits of binary data. Examples: > SELECT bit_length('Spark SQL'); 72 Since: 2.3.0","title":"bit_length"},{"location":"#bit_or","text":"bit_or(expr) - Returns the bitwise OR of all non-null input values, or null if none. Examples: > SELECT bit_or(col) FROM VALUES (3), (5) AS tab(col); 7 Since: 3.0.0","title":"bit_or"},{"location":"#bit_xor","text":"bit_xor(expr) - Returns the bitwise XOR of all non-null input values, or null if none. Examples: > SELECT bit_xor(col) FROM VALUES (3), (5) AS tab(col); 6 Since: 3.0.0","title":"bit_xor"},{"location":"#bool_and","text":"bool_and(expr) - Returns true if all values of expr are true. Examples: > SELECT bool_and(col) FROM VALUES (true), (true), (true) AS tab(col); true > SELECT bool_and(col) FROM VALUES (NULL), (true), (true) AS tab(col); true > SELECT bool_and(col) FROM VALUES (true), (false), (true) AS tab(col); false Since: 3.0.0","title":"bool_and"},{"location":"#bool_or","text":"bool_or(expr) - Returns true if at least one value of expr is true. Examples: > SELECT bool_or(col) FROM VALUES (true), (false), (false) AS tab(col); true > SELECT bool_or(col) FROM VALUES (NULL), (true), (false) AS tab(col); true > SELECT bool_or(col) FROM VALUES (false), (false), (NULL) AS tab(col); false Since: 3.0.0","title":"bool_or"},{"location":"#boolean","text":"boolean(expr) - Casts the value expr to the target data type boolean . Since: 2.0.1","title":"boolean"},{"location":"#bround","text":"bround(expr, d) - Returns expr rounded to d decimal places using HALF_EVEN rounding mode. Examples: > SELECT bround(2.5, 0); 2 Since: 2.0.0","title":"bround"},{"location":"#cardinality","text":"cardinality(expr) - Returns the size of an array or a map. The function returns null for null input if spark.sql.legacy.sizeOfNull is set to false or spark.sql.ansi.enabled is set to true. Otherwise, the function returns -1 for null input. With the default settings, the function returns -1 for null input. Examples: > SELECT cardinality(array('b', 'd', 'c', 'a')); 4 > SELECT cardinality(map('a', 1, 'b', 2)); 2 > SELECT cardinality(NULL); -1 Since: 1.5.0","title":"cardinality"},{"location":"#cast","text":"cast(expr AS type) - Casts the value expr to the target data type type . Examples: > SELECT cast('10' as int); 10 Since: 1.0.0","title":"cast"},{"location":"#cbrt","text":"cbrt(expr) - Returns the cube root of expr . Examples: > SELECT cbrt(27.0); 3.0 Since: 1.4.0","title":"cbrt"},{"location":"#ceil","text":"ceil(expr) - Returns the smallest integer not smaller than expr . Examples: > SELECT ceil(-0.1); 0 > SELECT ceil(5); 5 Since: 1.4.0","title":"ceil"},{"location":"#ceiling","text":"ceiling(expr) - Returns the smallest integer not smaller than expr . Examples: > SELECT ceiling(-0.1); 0 > SELECT ceiling(5); 5 Since: 1.4.0","title":"ceiling"},{"location":"#char","text":"char(expr) - Returns the ASCII character having the binary equivalent to expr . If n is larger than 256 the result is equivalent to chr(n % 256) Examples: > SELECT char(65); A Since: 2.3.0","title":"char"},{"location":"#char_length","text":"char_length(expr) - Returns the character length of string data or number of bytes of binary data. The length of string data includes the trailing spaces. The length of binary data includes binary zeros. Examples: > SELECT char_length('Spark SQL '); 10 > SELECT CHAR_LENGTH('Spark SQL '); 10 > SELECT CHARACTER_LENGTH('Spark SQL '); 10 Since: 1.5.0","title":"char_length"},{"location":"#character_length","text":"character_length(expr) - Returns the character length of string data or number of bytes of binary data. The length of string data includes the trailing spaces. The length of binary data includes binary zeros. Examples: > SELECT character_length('Spark SQL '); 10 > SELECT CHAR_LENGTH('Spark SQL '); 10 > SELECT CHARACTER_LENGTH('Spark SQL '); 10 Since: 1.5.0","title":"character_length"},{"location":"#chr","text":"chr(expr) - Returns the ASCII character having the binary equivalent to expr . If n is larger than 256 the result is equivalent to chr(n % 256) Examples: > SELECT chr(65); A Since: 2.3.0","title":"chr"},{"location":"#coalesce","text":"coalesce(expr1, expr2, ...) - Returns the first non-null argument if exists. Otherwise, null. Examples: > SELECT coalesce(NULL, 1, NULL); 1 Since: 1.0.0","title":"coalesce"},{"location":"#collect_list","text":"collect_list(expr) - Collects and returns a list of non-unique elements. Examples: > SELECT collect_list(col) FROM VALUES (1), (2), (1) AS tab(col); [1,2,1] Note: The function is non-deterministic because the order of collected results depends on the order of the rows which may be non-deterministic after a shuffle. Since: 2.0.0","title":"collect_list"},{"location":"#collect_set","text":"collect_set(expr) - Collects and returns a set of unique elements. Examples: > SELECT collect_set(col) FROM VALUES (1), (2), (1) AS tab(col); [1,2] Note: The function is non-deterministic because the order of collected results depends on the order of the rows which may be non-deterministic after a shuffle. Since: 2.0.0","title":"collect_set"},{"location":"#concat","text":"concat(col1, col2, ..., colN) - Returns the concatenation of col1, col2, ..., colN. Examples: > SELECT concat('Spark', 'SQL'); SparkSQL > SELECT concat(array(1, 2, 3), array(4, 5), array(6)); [1,2,3,4,5,6] Note: Concat logic for arrays is available since 2.4.0. Since: 1.5.0","title":"concat"},{"location":"#concat_ws","text":"concat_ws(sep[, str | array(str)]+) - Returns the concatenation of the strings separated by sep . Examples: > SELECT concat_ws(' ', 'Spark', 'SQL'); Spark SQL > SELECT concat_ws('s'); Since: 1.5.0","title":"concat_ws"},{"location":"#conv","text":"conv(num, from_base, to_base) - Convert num from from_base to to_base . Examples: > SELECT conv('100', 2, 10); 4 > SELECT conv(-10, 16, -10); -16 Since: 1.5.0","title":"conv"},{"location":"#corr","text":"corr(expr1, expr2) - Returns Pearson coefficient of correlation between a set of number pairs. Examples: > SELECT corr(c1, c2) FROM VALUES (3, 2), (3, 3), (6, 4) as tab(c1, c2); 0.8660254037844387 Since: 1.6.0","title":"corr"},{"location":"#cos","text":"cos(expr) - Returns the cosine of expr , as if computed by java.lang.Math.cos . Arguments: expr - angle in radians Examples: > SELECT cos(0); 1.0 Since: 1.4.0","title":"cos"},{"location":"#cosh","text":"cosh(expr) - Returns the hyperbolic cosine of expr , as if computed by java.lang.Math.cosh . Arguments: expr - hyperbolic angle Examples: > SELECT cosh(0); 1.0 Since: 1.4.0","title":"cosh"},{"location":"#cot","text":"cot(expr) - Returns the cotangent of expr , as if computed by 1/java.lang.Math.cot . Arguments: expr - angle in radians Examples: > SELECT cot(1); 0.6420926159343306 Since: 2.3.0","title":"cot"},{"location":"#count","text":"count(*) - Returns the total number of retrieved rows, including rows containing null. count(expr[, expr...]) - Returns the number of rows for which the supplied expression(s) are all non-null. count(DISTINCT expr[, expr...]) - Returns the number of rows for which the supplied expression(s) are unique and non-null. Examples: > SELECT count(*) FROM VALUES (NULL), (5), (5), (20) AS tab(col); 4 > SELECT count(col) FROM VALUES (NULL), (5), (5), (20) AS tab(col); 3 > SELECT count(DISTINCT col) FROM VALUES (NULL), (5), (5), (10) AS tab(col); 2 Since: 1.0.0","title":"count"},{"location":"#count_if","text":"count_if(expr) - Returns the number of TRUE values for the expression. Examples: > SELECT count_if(col % 2 = 0) FROM VALUES (NULL), (0), (1), (2), (3) AS tab(col); 2 > SELECT count_if(col IS NULL) FROM VALUES (NULL), (0), (1), (2), (3) AS tab(col); 1 Since: 3.0.0","title":"count_if"},{"location":"#count_min_sketch","text":"count_min_sketch(col, eps, confidence, seed) - Returns a count-min sketch of a column with the given esp, confidence and seed. The result is an array of bytes, which can be deserialized to a CountMinSketch before usage. Count-min sketch is a probabilistic data structure used for cardinality estimation using sub-linear space. Examples: > SELECT hex(count_min_sketch(col, 0.5d, 0.5d, 1)) FROM VALUES (1), (2), (1) AS tab(col); 0000000100000000000000030000000100000004000000005D8D6AB90000000000000000000000000000000200000000000000010000000000000000 Since: 2.2.0","title":"count_min_sketch"},{"location":"#covar_pop","text":"covar_pop(expr1, expr2) - Returns the population covariance of a set of number pairs. Examples: > SELECT covar_pop(c1, c2) FROM VALUES (1,1), (2,2), (3,3) AS tab(c1, c2); 0.6666666666666666 Since: 2.0.0","title":"covar_pop"},{"location":"#covar_samp","text":"covar_samp(expr1, expr2) - Returns the sample covariance of a set of number pairs. Examples: > SELECT covar_samp(c1, c2) FROM VALUES (1,1), (2,2), (3,3) AS tab(c1, c2); 1.0 Since: 2.0.0","title":"covar_samp"},{"location":"#crc32","text":"crc32(expr) - Returns a cyclic redundancy check value of the expr as a bigint. Examples: > SELECT crc32('Spark'); 1557323817 Since: 1.5.0","title":"crc32"},{"location":"#cube","text":"cube([col1[, col2 ..]]) - create a multi-dimensional cube using the specified columns so that we can run aggregation on them. Examples: > SELECT name, age, count(*) FROM VALUES (2, 'Alice'), (5, 'Bob') people(age, name) GROUP BY cube(name, age); Bob 5 1 Alice 2 1 Alice NULL 1 NULL 2 1 NULL NULL 2 Bob NULL 1 NULL 5 1 Since: 2.0.0","title":"cube"},{"location":"#cume_dist","text":"cume_dist() - Computes the position of a value relative to all values in the partition. Examples: > SELECT a, b, cume_dist() OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 0.6666666666666666 A1 1 0.6666666666666666 A1 2 1.0 A2 3 1.0 Since: 2.0.0","title":"cume_dist"},{"location":"#current_catalog","text":"current_catalog() - Returns the current catalog. Examples: > SELECT current_catalog(); spark_catalog Since: 3.1.0","title":"current_catalog"},{"location":"#current_database","text":"current_database() - Returns the current database. Examples: > SELECT current_database(); default Since: 1.6.0","title":"current_database"},{"location":"#current_date","text":"current_date() - Returns the current date at the start of query evaluation. All calls of current_date within the same query return the same value. current_date - Returns the current date at the start of query evaluation. Examples: > SELECT current_date(); 2020-04-25 > SELECT current_date; 2020-04-25 Note: The syntax without braces has been supported since 2.0.1. Since: 1.5.0","title":"current_date"},{"location":"#current_timestamp","text":"current_timestamp() - Returns the current timestamp at the start of query evaluation. All calls of current_timestamp within the same query return the same value. current_timestamp - Returns the current timestamp at the start of query evaluation. Examples: > SELECT current_timestamp(); 2020-04-25 15:49:11.914 > SELECT current_timestamp; 2020-04-25 15:49:11.914 Note: The syntax without braces has been supported since 2.0.1. Since: 1.5.0","title":"current_timestamp"},{"location":"#current_timezone","text":"current_timezone() - Returns the current session local timezone. Examples: > SELECT current_timezone(); Asia/Shanghai Since: 3.1.0","title":"current_timezone"},{"location":"#date","text":"date(expr) - Casts the value expr to the target data type date . Since: 2.0.1","title":"date"},{"location":"#date_add","text":"date_add(start_date, num_days) - Returns the date that is num_days after start_date . Examples: > SELECT date_add('2016-07-30', 1); 2016-07-31 Since: 1.5.0","title":"date_add"},{"location":"#date_format","text":"date_format(timestamp, fmt) - Converts timestamp to a value of string in the format specified by the date format fmt . Arguments: timestamp - A date/timestamp or string to be converted to the given format. fmt - Date/time format pattern to follow. See Datetime Patterns for valid date and time format patterns. Examples: > SELECT date_format('2016-04-08', 'y'); 2016 Since: 1.5.0","title":"date_format"},{"location":"#date_from_unix_date","text":"date_from_unix_date(days) - Create date from the number of days since 1970-01-01. Examples: > SELECT date_from_unix_date(1); 1970-01-02 Since: 3.1.0","title":"date_from_unix_date"},{"location":"#date_part","text":"date_part(field, source) - Extracts a part of the date/timestamp or interval source. Arguments: field - selects which part of the source should be extracted, and supported string values are as same as the fields of the equivalent function EXTRACT . source - a date/timestamp or interval column from where field should be extracted Examples: > SELECT date_part('YEAR', TIMESTAMP '2019-08-12 01:00:00.123456'); 2019 > SELECT date_part('week', timestamp'2019-08-12 01:00:00.123456'); 33 > SELECT date_part('doy', DATE'2019-08-12'); 224 > SELECT date_part('SECONDS', timestamp'2019-10-01 00:00:01.000001'); 1.000001 > SELECT date_part('days', interval 1 year 10 months 5 days); 5 > SELECT date_part('seconds', interval 5 hours 30 seconds 1 milliseconds 1 microseconds); 30.001001 Note: The date_part function is equivalent to the SQL-standard function EXTRACT(field FROM source) Since: 3.0.0","title":"date_part"},{"location":"#date_sub","text":"date_sub(start_date, num_days) - Returns the date that is num_days before start_date . Examples: > SELECT date_sub('2016-07-30', 1); 2016-07-29 Since: 1.5.0","title":"date_sub"},{"location":"#date_trunc","text":"date_trunc(fmt, ts) - Returns timestamp ts truncated to the unit specified by the format model fmt . Arguments: fmt - the format representing the unit to be truncated to \"YEAR\", \"YYYY\", \"YY\" - truncate to the first date of the year that the ts falls in, the time part will be zero out \"QUARTER\" - truncate to the first date of the quarter that the ts falls in, the time part will be zero out \"MONTH\", \"MM\", \"MON\" - truncate to the first date of the month that the ts falls in, the time part will be zero out \"WEEK\" - truncate to the Monday of the week that the ts falls in, the time part will be zero out \"DAY\", \"DD\" - zero out the time part \"HOUR\" - zero out the minute and second with fraction part \"MINUTE\"- zero out the second with fraction part \"SECOND\" - zero out the second fraction part \"MILLISECOND\" - zero out the microseconds \"MICROSECOND\" - everything remains ts - datetime value or valid timestamp string Examples: > SELECT date_trunc('YEAR', '2015-03-05T09:32:05.359'); 2015-01-01 00:00:00 > SELECT date_trunc('MM', '2015-03-05T09:32:05.359'); 2015-03-01 00:00:00 > SELECT date_trunc('DD', '2015-03-05T09:32:05.359'); 2015-03-05 00:00:00 > SELECT date_trunc('HOUR', '2015-03-05T09:32:05.359'); 2015-03-05 09:00:00 > SELECT date_trunc('MILLISECOND', '2015-03-05T09:32:05.123456'); 2015-03-05 09:32:05.123 Since: 2.3.0","title":"date_trunc"},{"location":"#datediff","text":"datediff(endDate, startDate) - Returns the number of days from startDate to endDate . Examples: > SELECT datediff('2009-07-31', '2009-07-30'); 1 > SELECT datediff('2009-07-30', '2009-07-31'); -1 Since: 1.5.0","title":"datediff"},{"location":"#day","text":"day(date) - Returns the day of month of the date/timestamp. Examples: > SELECT day('2009-07-30'); 30 Since: 1.5.0","title":"day"},{"location":"#dayofmonth","text":"dayofmonth(date) - Returns the day of month of the date/timestamp. Examples: > SELECT dayofmonth('2009-07-30'); 30 Since: 1.5.0","title":"dayofmonth"},{"location":"#dayofweek","text":"dayofweek(date) - Returns the day of the week for date/timestamp (1 = Sunday, 2 = Monday, ..., 7 = Saturday). Examples: > SELECT dayofweek('2009-07-30'); 5 Since: 2.3.0","title":"dayofweek"},{"location":"#dayofyear","text":"dayofyear(date) - Returns the day of year of the date/timestamp. Examples: > SELECT dayofyear('2016-04-09'); 100 Since: 1.5.0","title":"dayofyear"},{"location":"#decimal","text":"decimal(expr) - Casts the value expr to the target data type decimal . Since: 2.0.1","title":"decimal"},{"location":"#decode","text":"decode(bin, charset) - Decodes the first argument using the second argument character set. Examples: > SELECT decode(encode('abc', 'utf-8'), 'utf-8'); abc Since: 1.5.0","title":"decode"},{"location":"#degrees","text":"degrees(expr) - Converts radians to degrees. Arguments: expr - angle in radians Examples: > SELECT degrees(3.141592653589793); 180.0 Since: 1.4.0","title":"degrees"},{"location":"#dense_rank","text":"dense_rank() - Computes the rank of a value in a group of values. The result is one plus the previously assigned rank value. Unlike the function rank, dense_rank will not produce gaps in the ranking sequence. Arguments: children - this is to base the rank on; a change in the value of one the children will trigger a change in rank. This is an internal parameter and will be assigned by the Analyser. Examples: > SELECT a, b, dense_rank(b) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 1 A1 1 1 A1 2 2 A2 3 1 Since: 2.0.0","title":"dense_rank"},{"location":"#div","text":"expr1 div expr2 - Divide expr1 by expr2 . It returns NULL if an operand is NULL or expr2 is 0. The result is casted to long. Examples: > SELECT 3 div 2; 1 Since: 3.0.0","title":"div"},{"location":"#double","text":"double(expr) - Casts the value expr to the target data type double . Since: 2.0.1","title":"double"},{"location":"#e","text":"e() - Returns Euler's number, e. Examples: > SELECT e(); 2.718281828459045 Since: 1.5.0","title":"e"},{"location":"#element_at","text":"element_at(array, index) - Returns element of array at given (1-based) index. If index < 0, accesses elements from the last to the first. The function returns NULL if the index exceeds the length of the array and spark.sql.ansi.enabled is set to false. If spark.sql.ansi.enabled is set to true, it throws ArrayIndexOutOfBoundsException for invalid indices. element_at(map, key) - Returns value for given key. The function returns NULL if the key is not contained in the map and spark.sql.ansi.enabled is set to false. If spark.sql.ansi.enabled is set to true, it throws NoSuchElementException instead. Examples: > SELECT element_at(array(1, 2, 3), 2); 2 > SELECT element_at(map(1, 'a', 2, 'b'), 2); b Since: 2.4.0","title":"element_at"},{"location":"#elt","text":"elt(n, input1, input2, ...) - Returns the n -th input, e.g., returns input2 when n is 2. The function returns NULL if the index exceeds the length of the array and spark.sql.ansi.enabled is set to false. If spark.sql.ansi.enabled is set to true, it throws ArrayIndexOutOfBoundsException for invalid indices. Examples: > SELECT elt(1, 'scala', 'java'); scala Since: 2.0.0","title":"elt"},{"location":"#encode","text":"encode(str, charset) - Encodes the first argument using the second argument character set. Examples: > SELECT encode('abc', 'utf-8'); abc Since: 1.5.0","title":"encode"},{"location":"#every","text":"every(expr) - Returns true if all values of expr are true. Examples: > SELECT every(col) FROM VALUES (true), (true), (true) AS tab(col); true > SELECT every(col) FROM VALUES (NULL), (true), (true) AS tab(col); true > SELECT every(col) FROM VALUES (true), (false), (true) AS tab(col); false Since: 3.0.0","title":"every"},{"location":"#exists","text":"exists(expr, pred) - Tests whether a predicate holds for one or more elements in the array. Examples: > SELECT exists(array(1, 2, 3), x -> x % 2 == 0); true > SELECT exists(array(1, 2, 3), x -> x % 2 == 10); false > SELECT exists(array(1, null, 3), x -> x % 2 == 0); NULL > SELECT exists(array(0, null, 2, 3, null), x -> x IS NULL); true > SELECT exists(array(1, 2, 3), x -> x IS NULL); false Since: 2.4.0","title":"exists"},{"location":"#exp","text":"exp(expr) - Returns e to the power of expr . Examples: > SELECT exp(0); 1.0 Since: 1.4.0","title":"exp"},{"location":"#explode","text":"explode(expr) - Separates the elements of array expr into multiple rows, or the elements of map expr into multiple rows and columns. Unless specified otherwise, uses the default column name col for elements of the array or key and value for the elements of the map. Examples: > SELECT explode(array(10, 20)); 10 20 Since: 1.0.0","title":"explode"},{"location":"#explode_outer","text":"explode_outer(expr) - Separates the elements of array expr into multiple rows, or the elements of map expr into multiple rows and columns. Unless specified otherwise, uses the default column name col for elements of the array or key and value for the elements of the map. Examples: > SELECT explode_outer(array(10, 20)); 10 20 Since: 1.0.0","title":"explode_outer"},{"location":"#expm1","text":"expm1(expr) - Returns exp( expr ) - 1. Examples: > SELECT expm1(0); 0.0 Since: 1.4.0","title":"expm1"},{"location":"#extract","text":"extract(field FROM source) - Extracts a part of the date/timestamp or interval source. Arguments: field - selects which part of the source should be extracted Supported string values of field for dates and timestamps are(case insensitive): \"YEAR\", (\"Y\", \"YEARS\", \"YR\", \"YRS\") - the year field \"YEAROFWEEK\" - the ISO 8601 week-numbering year that the datetime falls in. For example, 2005-01-02 is part of the 53rd week of year 2004, so the result is 2004 \"QUARTER\", (\"QTR\") - the quarter (1 - 4) of the year that the datetime falls in \"MONTH\", (\"MON\", \"MONS\", \"MONTHS\") - the month field (1 - 12) \"WEEK\", (\"W\", \"WEEKS\") - the number of the ISO 8601 week-of-week-based-year. A week is considered to start on a Monday and week 1 is the first week with >3 days. In the ISO week-numbering system, it is possible for early-January dates to be part of the 52nd or 53rd week of the previous year, and for late-December dates to be part of the first week of the next year. For example, 2005-01-02 is part of the 53rd week of year 2004, while 2012-12-31 is part of the first week of 2013 \"DAY\", (\"D\", \"DAYS\") - the day of the month field (1 - 31) \"DAYOFWEEK\",(\"DOW\") - the day of the week for datetime as Sunday(1) to Saturday(7) \"DAYOFWEEK_ISO\",(\"DOW_ISO\") - ISO 8601 based day of the week for datetime as Monday(1) to Sunday(7) \"DOY\" - the day of the year (1 - 365/366) \"HOUR\", (\"H\", \"HOURS\", \"HR\", \"HRS\") - The hour field (0 - 23) \"MINUTE\", (\"M\", \"MIN\", \"MINS\", \"MINUTES\") - the minutes field (0 - 59) \"SECOND\", (\"S\", \"SEC\", \"SECONDS\", \"SECS\") - the seconds field, including fractional parts Supported string values of field for interval(which consists of months , days , microseconds ) are(case insensitive): \"YEAR\", (\"Y\", \"YEARS\", \"YR\", \"YRS\") - the total months / 12 \"MONTH\", (\"MON\", \"MONS\", \"MONTHS\") - the total months % 12 \"DAY\", (\"D\", \"DAYS\") - the days part of interval \"HOUR\", (\"H\", \"HOURS\", \"HR\", \"HRS\") - how many hours the microseconds contains \"MINUTE\", (\"M\", \"MIN\", \"MINS\", \"MINUTES\") - how many minutes left after taking hours from microseconds \"SECOND\", (\"S\", \"SEC\", \"SECONDS\", \"SECS\") - how many second with fractions left after taking hours and minutes from microseconds source - a date/timestamp or interval column from where field should be extracted Examples: > SELECT extract(YEAR FROM TIMESTAMP '2019-08-12 01:00:00.123456'); 2019 > SELECT extract(week FROM timestamp'2019-08-12 01:00:00.123456'); 33 > SELECT extract(doy FROM DATE'2019-08-12'); 224 > SELECT extract(SECONDS FROM timestamp'2019-10-01 00:00:01.000001'); 1.000001 > SELECT extract(days FROM interval 1 year 10 months 5 days); 5 > SELECT extract(seconds FROM interval 5 hours 30 seconds 1 milliseconds 1 microseconds); 30.001001 Note: The extract function is equivalent to date_part(field, source) . Since: 3.0.0","title":"extract"},{"location":"#factorial","text":"factorial(expr) - Returns the factorial of expr . expr is [0..20]. Otherwise, null. Examples: > SELECT factorial(5); 120 Since: 1.5.0","title":"factorial"},{"location":"#filter","text":"filter(expr, func) - Filters the input array using the given predicate. Examples: > SELECT filter(array(1, 2, 3), x -> x % 2 == 1); [1,3] > SELECT filter(array(0, 2, 3), (x, i) -> x > i); [2,3] > SELECT filter(array(0, null, 2, 3, null), x -> x IS NOT NULL); [0,2,3] Note: The inner function may use the index argument since 3.0.0. Since: 2.4.0","title":"filter"},{"location":"#find_in_set","text":"find_in_set(str, str_array) - Returns the index (1-based) of the given string ( str ) in the comma-delimited list ( str_array ). Returns 0, if the string was not found or if the given string ( str ) contains a comma. Examples: > SELECT find_in_set('ab','abc,b,ab,c,def'); 3 Since: 1.5.0","title":"find_in_set"},{"location":"#first","text":"first(expr[, isIgnoreNull]) - Returns the first value of expr for a group of rows. If isIgnoreNull is true, returns only non-null values. Examples: > SELECT first(col) FROM VALUES (10), (5), (20) AS tab(col); 10 > SELECT first(col) FROM VALUES (NULL), (5), (20) AS tab(col); NULL > SELECT first(col, true) FROM VALUES (NULL), (5), (20) AS tab(col); 5 Note: The function is non-deterministic because its results depends on the order of the rows which may be non-deterministic after a shuffle. Since: 2.0.0","title":"first"},{"location":"#first_value","text":"first_value(expr[, isIgnoreNull]) - Returns the first value of expr for a group of rows. If isIgnoreNull is true, returns only non-null values. Examples: > SELECT first_value(col) FROM VALUES (10), (5), (20) AS tab(col); 10 > SELECT first_value(col) FROM VALUES (NULL), (5), (20) AS tab(col); NULL > SELECT first_value(col, true) FROM VALUES (NULL), (5), (20) AS tab(col); 5 Note: The function is non-deterministic because its results depends on the order of the rows which may be non-deterministic after a shuffle. Since: 2.0.0","title":"first_value"},{"location":"#flatten","text":"flatten(arrayOfArrays) - Transforms an array of arrays into a single array. Examples: > SELECT flatten(array(array(1, 2), array(3, 4))); [1,2,3,4] Since: 2.4.0","title":"flatten"},{"location":"#float","text":"float(expr) - Casts the value expr to the target data type float . Since: 2.0.1","title":"float"},{"location":"#floor","text":"floor(expr) - Returns the largest integer not greater than expr . Examples: > SELECT floor(-0.1); -1 > SELECT floor(5); 5 Since: 1.4.0","title":"floor"},{"location":"#forall","text":"forall(expr, pred) - Tests whether a predicate holds for all elements in the array. Examples: > SELECT forall(array(1, 2, 3), x -> x % 2 == 0); false > SELECT forall(array(2, 4, 8), x -> x % 2 == 0); true > SELECT forall(array(1, null, 3), x -> x % 2 == 0); false > SELECT forall(array(2, null, 8), x -> x % 2 == 0); NULL Since: 3.0.0","title":"forall"},{"location":"#format_number","text":"format_number(expr1, expr2) - Formats the number expr1 like '#,###,###.##', rounded to expr2 decimal places. If expr2 is 0, the result has no decimal point or fractional part. expr2 also accept a user specified format. This is supposed to function like MySQL's FORMAT. Examples: > SELECT format_number(12332.123456, 4); 12,332.1235 > SELECT format_number(12332.123456, '##################.###'); 12332.123 Since: 1.5.0","title":"format_number"},{"location":"#format_string","text":"format_string(strfmt, obj, ...) - Returns a formatted string from printf-style format strings. Examples: > SELECT format_string(\"Hello World %d %s\", 100, \"days\"); Hello World 100 days Since: 1.5.0","title":"format_string"},{"location":"#from_csv","text":"from_csv(csvStr, schema[, options]) - Returns a struct value with the given csvStr and schema . Examples: > SELECT from_csv('1, 0.8', 'a INT, b DOUBLE'); {\"a\":1,\"b\":0.8} > SELECT from_csv('26/08/2015', 'time Timestamp', map('timestampFormat', 'dd/MM/yyyy')); {\"time\":2015-08-26 00:00:00} Since: 3.0.0","title":"from_csv"},{"location":"#from_json","text":"from_json(jsonStr, schema[, options]) - Returns a struct value with the given jsonStr and schema . Examples: > SELECT from_json('{\"a\":1, \"b\":0.8}', 'a INT, b DOUBLE'); {\"a\":1,\"b\":0.8} > SELECT from_json('{\"time\":\"26/08/2015\"}', 'time Timestamp', map('timestampFormat', 'dd/MM/yyyy')); {\"time\":2015-08-26 00:00:00} Since: 2.2.0","title":"from_json"},{"location":"#from_unixtime","text":"from_unixtime(unix_time[, fmt]) - Returns unix_time in the specified fmt . Arguments: unix_time - UNIX Timestamp to be converted to the provided format. fmt - Date/time format pattern to follow. See Datetime Patterns for valid date and time format patterns. The 'yyyy-MM-dd HH:mm:ss' pattern is used if omitted. Examples: > SELECT from_unixtime(0, 'yyyy-MM-dd HH:mm:ss'); 1969-12-31 16:00:00 > SELECT from_unixtime(0); 1969-12-31 16:00:00 Since: 1.5.0","title":"from_unixtime"},{"location":"#from_utc_timestamp","text":"from_utc_timestamp(timestamp, timezone) - Given a timestamp like '2017-07-14 02:40:00.0', interprets it as a time in UTC, and renders that time as a timestamp in the given time zone. For example, 'GMT+1' would yield '2017-07-14 03:40:00.0'. Examples: > SELECT from_utc_timestamp('2016-08-31', 'Asia/Seoul'); 2016-08-31 09:00:00 Since: 1.5.0","title":"from_utc_timestamp"},{"location":"#get_json_object","text":"get_json_object(json_txt, path) - Extracts a json object from path . Examples: > SELECT get_json_object('{\"a\":\"b\"}', '$.a'); b Since: 1.5.0","title":"get_json_object"},{"location":"#greatest","text":"greatest(expr, ...) - Returns the greatest value of all parameters, skipping null values. Examples: > SELECT greatest(10, 9, 2, 4, 3); 10 Since: 1.5.0","title":"greatest"},{"location":"#grouping","text":"grouping(col) - indicates whether a specified column in a GROUP BY is aggregated or not, returns 1 for aggregated or 0 for not aggregated in the result set.\", Examples: > SELECT name, grouping(name), sum(age) FROM VALUES (2, 'Alice'), (5, 'Bob') people(age, name) GROUP BY cube(name); Alice 0 2 Bob 0 5 NULL 1 7 Since: 2.0.0","title":"grouping"},{"location":"#grouping_id","text":"grouping_id([col1[, col2 ..]]) - returns the level of grouping, equals to (grouping(c1) << (n-1)) + (grouping(c2) << (n-2)) + ... + grouping(cn) Examples: > SELECT name, grouping_id(), sum(age), avg(height) FROM VALUES (2, 'Alice', 165), (5, 'Bob', 180) people(age, name, height) GROUP BY cube(name, height); Alice 0 2 165.0 Alice 1 2 165.0 NULL 3 7 172.5 Bob 0 5 180.0 Bob 1 5 180.0 NULL 2 2 165.0 NULL 2 5 180.0 Note: Input columns should match with grouping columns exactly, or empty (means all the grouping columns). Since: 2.0.0","title":"grouping_id"},{"location":"#hash","text":"hash(expr1, expr2, ...) - Returns a hash value of the arguments. Examples: > SELECT hash('Spark', array(123), 2); -1321691492 Since: 2.0.0","title":"hash"},{"location":"#hex","text":"hex(expr) - Converts expr to hexadecimal. Examples: > SELECT hex(17); 11 > SELECT hex('Spark SQL'); 537061726B2053514C Since: 1.5.0","title":"hex"},{"location":"#hour","text":"hour(timestamp) - Returns the hour component of the string/timestamp. Examples: > SELECT hour('2009-07-30 12:58:59'); 12 Since: 1.5.0","title":"hour"},{"location":"#hypot","text":"hypot(expr1, expr2) - Returns sqrt( expr1 2 + expr2 2). Examples: > SELECT hypot(3, 4); 5.0 Since: 1.4.0","title":"hypot"},{"location":"#if","text":"if(expr1, expr2, expr3) - If expr1 evaluates to true, then returns expr2 ; otherwise returns expr3 . Examples: > SELECT if(1 < 2, 'a', 'b'); a Since: 1.0.0","title":"if"},{"location":"#ifnull","text":"ifnull(expr1, expr2) - Returns expr2 if expr1 is null, or expr1 otherwise. Examples: > SELECT ifnull(NULL, array('2')); [\"2\"] Since: 2.0.0","title":"ifnull"},{"location":"#in","text":"expr1 in(expr2, expr3, ...) - Returns true if expr equals to any valN. Arguments: expr1, expr2, expr3, ... - the arguments must be same type. Examples: > SELECT 1 in(1, 2, 3); true > SELECT 1 in(2, 3, 4); false > SELECT named_struct('a', 1, 'b', 2) in(named_struct('a', 1, 'b', 1), named_struct('a', 1, 'b', 3)); false > SELECT named_struct('a', 1, 'b', 2) in(named_struct('a', 1, 'b', 2), named_struct('a', 1, 'b', 3)); true Since: 1.0.0","title":"in"},{"location":"#initcap","text":"initcap(str) - Returns str with the first letter of each word in uppercase. All other letters are in lowercase. Words are delimited by white space. Examples: > SELECT initcap('sPark sql'); Spark Sql Since: 1.5.0","title":"initcap"},{"location":"#inline","text":"inline(expr) - Explodes an array of structs into a table. Uses column names col1, col2, etc. by default unless specified otherwise. Examples: > SELECT inline(array(struct(1, 'a'), struct(2, 'b'))); 1 a 2 b Since: 2.0.0","title":"inline"},{"location":"#inline_outer","text":"inline_outer(expr) - Explodes an array of structs into a table. Uses column names col1, col2, etc. by default unless specified otherwise. Examples: > SELECT inline_outer(array(struct(1, 'a'), struct(2, 'b'))); 1 a 2 b Since: 2.0.0","title":"inline_outer"},{"location":"#input_file_block_length","text":"input_file_block_length() - Returns the length of the block being read, or -1 if not available. Examples: > SELECT input_file_block_length(); -1 Since: 2.2.0","title":"input_file_block_length"},{"location":"#input_file_block_start","text":"input_file_block_start() - Returns the start offset of the block being read, or -1 if not available. Examples: > SELECT input_file_block_start(); -1 Since: 2.2.0","title":"input_file_block_start"},{"location":"#input_file_name","text":"input_file_name() - Returns the name of the file being read, or empty string if not available. Examples: > SELECT input_file_name(); Since: 1.5.0","title":"input_file_name"},{"location":"#instr","text":"instr(str, substr) - Returns the (1-based) index of the first occurrence of substr in str . Examples: > SELECT instr('SparkSQL', 'SQL'); 6 Since: 1.5.0","title":"instr"},{"location":"#int","text":"int(expr) - Casts the value expr to the target data type int . Since: 2.0.1","title":"int"},{"location":"#isnan","text":"isnan(expr) - Returns true if expr is NaN, or false otherwise. Examples: > SELECT isnan(cast('NaN' as double)); true Since: 1.5.0","title":"isnan"},{"location":"#isnotnull","text":"isnotnull(expr) - Returns true if expr is not null, or false otherwise. Examples: > SELECT isnotnull(1); true Since: 1.0.0","title":"isnotnull"},{"location":"#isnull","text":"isnull(expr) - Returns true if expr is null, or false otherwise. Examples: > SELECT isnull(1); false Since: 1.0.0","title":"isnull"},{"location":"#java_method","text":"java_method(class, method[, arg1[, arg2 ..]]) - Calls a method with reflection. Examples: > SELECT java_method('java.util.UUID', 'randomUUID'); c33fb387-8500-4bfa-81d2-6e0e3e930df2 > SELECT java_method('java.util.UUID', 'fromString', 'a5cf6c42-0c85-418f-af6c-3e4e5b1328f2'); a5cf6c42-0c85-418f-af6c-3e4e5b1328f2 Since: 2.0.0","title":"java_method"},{"location":"#json_array_length","text":"json_array_length(jsonArray) - Returns the number of elements in the outmost JSON array. Arguments: jsonArray - A JSON array. NULL is returned in case of any other valid JSON string, NULL or an invalid JSON. Examples: > SELECT json_array_length('[1,2,3,4]'); 4 > SELECT json_array_length('[1,2,3,{\"f1\":1,\"f2\":[5,6]},4]'); 5 > SELECT json_array_length('[1,2'); NULL Since: 3.1.0","title":"json_array_length"},{"location":"#json_object_keys","text":"json_object_keys(json_object) - Returns all the keys of the outmost JSON object as an array. Arguments: json_object - A JSON object. If a valid JSON object is given, all the keys of the outmost object will be returned as an array. If it is any other valid JSON string, an invalid JSON string or an empty string, the function returns null. Examples: > SELECT json_object_keys('{}'); [] > SELECT json_object_keys('{\"key\": \"value\"}'); [\"key\"] > SELECT json_object_keys('{\"f1\":\"abc\",\"f2\":{\"f3\":\"a\", \"f4\":\"b\"}}'); [\"f1\",\"f2\"] Since: 3.1.0","title":"json_object_keys"},{"location":"#json_tuple","text":"json_tuple(jsonStr, p1, p2, ..., pn) - Returns a tuple like the function get_json_object, but it takes multiple names. All the input parameters and output column types are string. Examples: > SELECT json_tuple('{\"a\":1, \"b\":2}', 'a', 'b'); 1 2 Since: 1.6.0","title":"json_tuple"},{"location":"#kurtosis","text":"kurtosis(expr) - Returns the kurtosis value calculated from values of a group. Examples: > SELECT kurtosis(col) FROM VALUES (-10), (-20), (100), (1000) AS tab(col); -0.7014368047529627 > SELECT kurtosis(col) FROM VALUES (1), (10), (100), (10), (1) as tab(col); 0.19432323191699075 Since: 1.6.0","title":"kurtosis"},{"location":"#lag","text":"lag(input[, offset[, default]]) - Returns the value of input at the offset th row before the current row in the window. The default value of offset is 1 and the default value of default is null. If the value of input at the offset th row is null, null is returned. If there is no such offset row (e.g., when the offset is 1, the first row of the window does not have any previous row), default is returned. Arguments: input - a string expression to evaluate offset rows before the current row. offset - an int expression which is rows to jump back in the partition. default - a string expression which is to use when the offset row does not exist. Examples: > SELECT a, b, lag(b) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 NULL A1 1 1 A1 2 1 A2 3 NULL Since: 2.0.0","title":"lag"},{"location":"#last","text":"last(expr[, isIgnoreNull]) - Returns the last value of expr for a group of rows. If isIgnoreNull is true, returns only non-null values Examples: > SELECT last(col) FROM VALUES (10), (5), (20) AS tab(col); 20 > SELECT last(col) FROM VALUES (10), (5), (NULL) AS tab(col); NULL > SELECT last(col, true) FROM VALUES (10), (5), (NULL) AS tab(col); 5 Note: The function is non-deterministic because its results depends on the order of the rows which may be non-deterministic after a shuffle. Since: 2.0.0","title":"last"},{"location":"#last_day","text":"last_day(date) - Returns the last day of the month which the date belongs to. Examples: > SELECT last_day('2009-01-12'); 2009-01-31 Since: 1.5.0","title":"last_day"},{"location":"#last_value","text":"last_value(expr[, isIgnoreNull]) - Returns the last value of expr for a group of rows. If isIgnoreNull is true, returns only non-null values Examples: > SELECT last_value(col) FROM VALUES (10), (5), (20) AS tab(col); 20 > SELECT last_value(col) FROM VALUES (10), (5), (NULL) AS tab(col); NULL > SELECT last_value(col, true) FROM VALUES (10), (5), (NULL) AS tab(col); 5 Note: The function is non-deterministic because its results depends on the order of the rows which may be non-deterministic after a shuffle. Since: 2.0.0","title":"last_value"},{"location":"#lcase","text":"lcase(str) - Returns str with all characters changed to lowercase. Examples: > SELECT lcase('SparkSql'); sparksql Since: 1.0.1","title":"lcase"},{"location":"#lead","text":"lead(input[, offset[, default]]) - Returns the value of input at the offset th row after the current row in the window. The default value of offset is 1 and the default value of default is null. If the value of input at the offset th row is null, null is returned. If there is no such an offset row (e.g., when the offset is 1, the last row of the window does not have any subsequent row), default is returned. Arguments: input - a string expression to evaluate offset rows after the current row. offset - an int expression which is rows to jump ahead in the partition. default - a string expression which is to use when the offset is larger than the window. The default value is null. Examples: > SELECT a, b, lead(b) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 1 A1 1 2 A1 2 NULL A2 3 NULL Since: 2.0.0","title":"lead"},{"location":"#least","text":"least(expr, ...) - Returns the least value of all parameters, skipping null values. Examples: > SELECT least(10, 9, 2, 4, 3); 2 Since: 1.5.0","title":"least"},{"location":"#left","text":"left(str, len) - Returns the leftmost len ( len can be string type) characters from the string str ,if len is less or equal than 0 the result is an empty string. Examples: > SELECT left('Spark SQL', 3); Spa Since: 2.3.0","title":"left"},{"location":"#length","text":"length(expr) - Returns the character length of string data or number of bytes of binary data. The length of string data includes the trailing spaces. The length of binary data includes binary zeros. Examples: > SELECT length('Spark SQL '); 10 > SELECT CHAR_LENGTH('Spark SQL '); 10 > SELECT CHARACTER_LENGTH('Spark SQL '); 10 Since: 1.5.0","title":"length"},{"location":"#levenshtein","text":"levenshtein(str1, str2) - Returns the Levenshtein distance between the two given strings. Examples: > SELECT levenshtein('kitten', 'sitting'); 3 Since: 1.5.0","title":"levenshtein"},{"location":"#like","text":"str like pattern[ ESCAPE escape] - Returns true if str matches pattern with escape , null if any arguments are null, false otherwise. Arguments: str - a string expression pattern - a string expression. The pattern is a string which is matched literally, with exception to the following special symbols: _ matches any one character in the input (similar to . in posix regular expressions) % matches zero or more characters in the input (similar to .* in posix regular expressions) Since Spark 2.0, string literals are unescaped in our SQL parser. For example, in order to match \"\\abc\", the pattern should be \"\\abc\". When SQL config 'spark.sql.parser.escapedStringLiterals' is enabled, it fallbacks to Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the pattern to match \"\\abc\" should be \"\\abc\". * escape - an character added since Spark 3.0. The default escape character is the '\\'. If an escape character precedes a special symbol or another escape character, the following character is matched literally. It is invalid to escape any other character. Examples: > SELECT like('Spark', '_park'); true > SET spark.sql.parser.escapedStringLiterals=true; spark.sql.parser.escapedStringLiterals true > SELECT '%SystemDrive%\\Users\\John' like '\\%SystemDrive\\%\\\\Users%'; true > SET spark.sql.parser.escapedStringLiterals=false; spark.sql.parser.escapedStringLiterals false > SELECT '%SystemDrive%\\\\Users\\\\John' like '\\%SystemDrive\\%\\\\\\\\Users%'; true > SELECT '%SystemDrive%/Users/John' like '/%SystemDrive/%//Users%' ESCAPE '/'; true Note: Use RLIKE to match with standard regular expressions. Since: 1.0.0","title":"like"},{"location":"#ln","text":"ln(expr) - Returns the natural logarithm (base e) of expr . Examples: > SELECT ln(1); 0.0 Since: 1.4.0","title":"ln"},{"location":"#locate","text":"locate(substr, str[, pos]) - Returns the position of the first occurrence of substr in str after position pos . The given pos and return value are 1-based. Examples: > SELECT locate('bar', 'foobarbar'); 4 > SELECT locate('bar', 'foobarbar', 5); 7 > SELECT POSITION('bar' IN 'foobarbar'); 4 Since: 1.5.0","title":"locate"},{"location":"#log","text":"log(base, expr) - Returns the logarithm of expr with base . Examples: > SELECT log(10, 100); 2.0 Since: 1.5.0","title":"log"},{"location":"#log10","text":"log10(expr) - Returns the logarithm of expr with base 10. Examples: > SELECT log10(10); 1.0 Since: 1.4.0","title":"log10"},{"location":"#log1p","text":"log1p(expr) - Returns log(1 + expr ). Examples: > SELECT log1p(0); 0.0 Since: 1.4.0","title":"log1p"},{"location":"#log2","text":"log2(expr) - Returns the logarithm of expr with base 2. Examples: > SELECT log2(2); 1.0 Since: 1.4.0","title":"log2"},{"location":"#lower","text":"lower(str) - Returns str with all characters changed to lowercase. Examples: > SELECT lower('SparkSql'); sparksql Since: 1.0.1","title":"lower"},{"location":"#lpad","text":"lpad(str, len[, pad]) - Returns str , left-padded with pad to a length of len . If str is longer than len , the return value is shortened to len characters. If pad is not specified, str will be padded to the left with space characters. Examples: > SELECT lpad('hi', 5, '??'); ???hi > SELECT lpad('hi', 1, '??'); h > SELECT lpad('hi', 5); hi Since: 1.5.0","title":"lpad"},{"location":"#ltrim","text":"ltrim(str) - Removes the leading space characters from str . Arguments: str - a string expression trimStr - the trim string characters to trim, the default value is a single space Examples: > SELECT ltrim(' SparkSQL '); SparkSQL Since: 1.5.0","title":"ltrim"},{"location":"#make_date","text":"make_date(year, month, day) - Create date from year, month and day fields. Arguments: year - the year to represent, from 1 to 9999 month - the month-of-year to represent, from 1 (January) to 12 (December) day - the day-of-month to represent, from 1 to 31 Examples: > SELECT make_date(2013, 7, 15); 2013-07-15 > SELECT make_date(2019, 13, 1); NULL > SELECT make_date(2019, 7, NULL); NULL > SELECT make_date(2019, 2, 30); NULL Since: 3.0.0","title":"make_date"},{"location":"#make_interval","text":"make_interval(years, months, weeks, days, hours, mins, secs) - Make interval from years, months, weeks, days, hours, mins and secs. Arguments: years - the number of years, positive or negative months - the number of months, positive or negative weeks - the number of weeks, positive or negative days - the number of days, positive or negative hours - the number of hours, positive or negative mins - the number of minutes, positive or negative secs - the number of seconds with the fractional part in microsecond precision. Examples: > SELECT make_interval(100, 11, 1, 1, 12, 30, 01.001001); 100 years 11 months 8 days 12 hours 30 minutes 1.001001 seconds > SELECT make_interval(100, null, 3); NULL > SELECT make_interval(0, 1, 0, 1, 0, 0, 100.000001); 1 months 1 days 1 minutes 40.000001 seconds Since: 3.0.0","title":"make_interval"},{"location":"#make_timestamp","text":"make_timestamp(year, month, day, hour, min, sec[, timezone]) - Create timestamp from year, month, day, hour, min, sec and timezone fields. Arguments: year - the year to represent, from 1 to 9999 month - the month-of-year to represent, from 1 (January) to 12 (December) day - the day-of-month to represent, from 1 to 31 hour - the hour-of-day to represent, from 0 to 23 min - the minute-of-hour to represent, from 0 to 59 sec - the second-of-minute and its micro-fraction to represent, from 0 to 60. If the sec argument equals to 60, the seconds field is set to 0 and 1 minute is added to the final timestamp. timezone - the time zone identifier. For example, CET, UTC and etc. Examples: > SELECT make_timestamp(2014, 12, 28, 6, 30, 45.887); 2014-12-28 06:30:45.887 > SELECT make_timestamp(2014, 12, 28, 6, 30, 45.887, 'CET'); 2014-12-27 21:30:45.887 > SELECT make_timestamp(2019, 6, 30, 23, 59, 60); 2019-07-01 00:00:00 > SELECT make_timestamp(2019, 13, 1, 10, 11, 12, 'PST'); NULL > SELECT make_timestamp(null, 7, 22, 15, 30, 0); NULL Since: 3.0.0","title":"make_timestamp"},{"location":"#map","text":"map(key0, value0, key1, value1, ...) - Creates a map with the given key/value pairs. Examples: > SELECT map(1.0, '2', 3.0, '4'); {1.0:\"2\",3.0:\"4\"} Since: 2.0.0","title":"map"},{"location":"#map_concat","text":"map_concat(map, ...) - Returns the union of all the given maps Examples: > SELECT map_concat(map(1, 'a', 2, 'b'), map(3, 'c')); {1:\"a\",2:\"b\",3:\"c\"} Since: 2.4.0","title":"map_concat"},{"location":"#map_entries","text":"map_entries(map) - Returns an unordered array of all entries in the given map. Examples: > SELECT map_entries(map(1, 'a', 2, 'b')); [{\"key\":1,\"value\":\"a\"},{\"key\":2,\"value\":\"b\"}] Since: 3.0.0","title":"map_entries"},{"location":"#map_filter","text":"map_filter(expr, func) - Filters entries in a map using the function. Examples: > SELECT map_filter(map(1, 0, 2, 2, 3, -1), (k, v) -> k > v); {1:0,3:-1} Since: 3.0.0","title":"map_filter"},{"location":"#map_from_arrays","text":"map_from_arrays(keys, values) - Creates a map with a pair of the given key/value arrays. All elements in keys should not be null Examples: > SELECT map_from_arrays(array(1.0, 3.0), array('2', '4')); {1.0:\"2\",3.0:\"4\"} Since: 2.4.0","title":"map_from_arrays"},{"location":"#map_from_entries","text":"map_from_entries(arrayOfEntries) - Returns a map created from the given array of entries. Examples: > SELECT map_from_entries(array(struct(1, 'a'), struct(2, 'b'))); {1:\"a\",2:\"b\"} Since: 2.4.0","title":"map_from_entries"},{"location":"#map_keys","text":"map_keys(map) - Returns an unordered array containing the keys of the map. Examples: > SELECT map_keys(map(1, 'a', 2, 'b')); [1,2] Since: 2.0.0","title":"map_keys"},{"location":"#map_values","text":"map_values(map) - Returns an unordered array containing the values of the map. Examples: > SELECT map_values(map(1, 'a', 2, 'b')); [\"a\",\"b\"] Since: 2.0.0","title":"map_values"},{"location":"#map_zip_with","text":"map_zip_with(map1, map2, function) - Merges two given maps into a single map by applying function to the pair of values with the same key. For keys only presented in one map, NULL will be passed as the value for the missing key. If an input map contains duplicated keys, only the first entry of the duplicated key is passed into the lambda function. Examples: > SELECT map_zip_with(map(1, 'a', 2, 'b'), map(1, 'x', 2, 'y'), (k, v1, v2) -> concat(v1, v2)); {1:\"ax\",2:\"by\"} Since: 3.0.0","title":"map_zip_with"},{"location":"#max","text":"max(expr) - Returns the maximum value of expr . Examples: > SELECT max(col) FROM VALUES (10), (50), (20) AS tab(col); 50 Since: 1.0.0","title":"max"},{"location":"#max_by","text":"max_by(x, y) - Returns the value of x associated with the maximum value of y . Examples: > SELECT max_by(x, y) FROM VALUES (('a', 10)), (('b', 50)), (('c', 20)) AS tab(x, y); b Since: 3.0.0","title":"max_by"},{"location":"#md5","text":"md5(expr) - Returns an MD5 128-bit checksum as a hex string of expr . Examples: > SELECT md5('Spark'); 8cde774d6f7333752ed72cacddb05126 Since: 1.5.0","title":"md5"},{"location":"#mean","text":"mean(expr) - Returns the mean calculated from values of a group. Examples: > SELECT mean(col) FROM VALUES (1), (2), (3) AS tab(col); 2.0 > SELECT mean(col) FROM VALUES (1), (2), (NULL) AS tab(col); 1.5 Since: 1.0.0","title":"mean"},{"location":"#min","text":"min(expr) - Returns the minimum value of expr . Examples: > SELECT min(col) FROM VALUES (10), (-1), (20) AS tab(col); -1 Since: 1.0.0","title":"min"},{"location":"#min_by","text":"min_by(x, y) - Returns the value of x associated with the minimum value of y . Examples: > SELECT min_by(x, y) FROM VALUES (('a', 10)), (('b', 50)), (('c', 20)) AS tab(x, y); a Since: 3.0.0","title":"min_by"},{"location":"#minute","text":"minute(timestamp) - Returns the minute component of the string/timestamp. Examples: > SELECT minute('2009-07-30 12:58:59'); 58 Since: 1.5.0","title":"minute"},{"location":"#mod","text":"expr1 mod expr2 - Returns the remainder after expr1 / expr2 . Examples: > SELECT 2 % 1.8; 0.2 > SELECT MOD(2, 1.8); 0.2 Since: 1.0.0","title":"mod"},{"location":"#monotonically_increasing_id","text":"monotonically_increasing_id() - Returns monotonically increasing 64-bit integers. The generated ID is guaranteed to be monotonically increasing and unique, but not consecutive. The current implementation puts the partition ID in the upper 31 bits, and the lower 33 bits represent the record number within each partition. The assumption is that the data frame has less than 1 billion partitions, and each partition has less than 8 billion records. The function is non-deterministic because its result depends on partition IDs. Examples: > SELECT monotonically_increasing_id(); 0 Since: 1.4.0","title":"monotonically_increasing_id"},{"location":"#month","text":"month(date) - Returns the month component of the date/timestamp. Examples: > SELECT month('2016-07-30'); 7 Since: 1.5.0","title":"month"},{"location":"#months_between","text":"months_between(timestamp1, timestamp2[, roundOff]) - If timestamp1 is later than timestamp2 , then the result is positive. If timestamp1 and timestamp2 are on the same day of month, or both are the last day of month, time of day will be ignored. Otherwise, the difference is calculated based on 31 days per month, and rounded to 8 digits unless roundOff=false. Examples: > SELECT months_between('1997-02-28 10:30:00', '1996-10-30'); 3.94959677 > SELECT months_between('1997-02-28 10:30:00', '1996-10-30', false); 3.9495967741935485 Since: 1.5.0","title":"months_between"},{"location":"#named_struct","text":"named_struct(name1, val1, name2, val2, ...) - Creates a struct with the given field names and values. Examples: > SELECT named_struct(\"a\", 1, \"b\", 2, \"c\", 3); {\"a\":1,\"b\":2,\"c\":3} Since: 1.5.0","title":"named_struct"},{"location":"#nanvl","text":"nanvl(expr1, expr2) - Returns expr1 if it's not NaN, or expr2 otherwise. Examples: > SELECT nanvl(cast('NaN' as double), 123); 123.0 Since: 1.5.0","title":"nanvl"},{"location":"#negative","text":"negative(expr) - Returns the negated value of expr . Examples: > SELECT negative(1); -1 Since: 1.0.0","title":"negative"},{"location":"#next_day","text":"next_day(start_date, day_of_week) - Returns the first date which is later than start_date and named as indicated. Examples: > SELECT next_day('2015-01-14', 'TU'); 2015-01-20 Since: 1.5.0","title":"next_day"},{"location":"#not","text":"not expr - Logical not. Examples: > SELECT not true; false > SELECT not false; true > SELECT not NULL; NULL Since: 1.0.0","title":"not"},{"location":"#now","text":"now() - Returns the current timestamp at the start of query evaluation. Examples: > SELECT now(); 2020-04-25 15:49:11.914 Since: 1.6.0","title":"now"},{"location":"#nth_value","text":"nth_value(input[, offset]) - Returns the value of input at the row that is the offset th row from beginning of the window frame. Offset starts at 1. If ignoreNulls=true, we will skip nulls when finding the offset th row. Otherwise, every row counts for the offset . If there is no such an offset th row (e.g., when the offset is 10, size of the window frame is less than 10), null is returned. Arguments: input - the target column or expression that the function operates on. offset - a positive int literal to indicate the offset in the window frame. It starts with 1. ignoreNulls - an optional specification that indicates the NthValue should skip null values in the determination of which row to use. Examples: > SELECT a, b, nth_value(b, 2) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 1 A1 1 1 A1 2 1 A2 3 NULL Since: 3.1.0","title":"nth_value"},{"location":"#ntile","text":"ntile(n) - Divides the rows for each window partition into n buckets ranging from 1 to at most n . Arguments: buckets - an int expression which is number of buckets to divide the rows in. Default value is 1. Examples: > SELECT a, b, ntile(2) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 1 A1 1 1 A1 2 2 A2 3 1 Since: 2.0.0","title":"ntile"},{"location":"#nullif","text":"nullif(expr1, expr2) - Returns null if expr1 equals to expr2 , or expr1 otherwise. Examples: > SELECT nullif(2, 2); NULL Since: 2.0.0","title":"nullif"},{"location":"#nvl","text":"nvl(expr1, expr2) - Returns expr2 if expr1 is null, or expr1 otherwise. Examples: > SELECT nvl(NULL, array('2')); [\"2\"] Since: 2.0.0","title":"nvl"},{"location":"#nvl2","text":"nvl2(expr1, expr2, expr3) - Returns expr2 if expr1 is not null, or expr3 otherwise. Examples: > SELECT nvl2(NULL, 2, 1); 1 Since: 2.0.0","title":"nvl2"},{"location":"#octet_length","text":"octet_length(expr) - Returns the byte length of string data or number of bytes of binary data. Examples: > SELECT octet_length('Spark SQL'); 9 Since: 2.3.0","title":"octet_length"},{"location":"#or","text":"expr1 or expr2 - Logical OR. Examples: > SELECT true or false; true > SELECT false or false; false > SELECT true or NULL; true > SELECT false or NULL; NULL Since: 1.0.0","title":"or"},{"location":"#overlay","text":"overlay(input, replace, pos[, len]) - Replace input with replace that starts at pos and is of length len . Examples: > SELECT overlay('Spark SQL' PLACING '_' FROM 6); Spark_SQL > SELECT overlay('Spark SQL' PLACING 'CORE' FROM 7); Spark CORE > SELECT overlay('Spark SQL' PLACING 'ANSI ' FROM 7 FOR 0); Spark ANSI SQL > SELECT overlay('Spark SQL' PLACING 'tructured' FROM 2 FOR 4); Structured SQL > SELECT overlay(encode('Spark SQL', 'utf-8') PLACING encode('_', 'utf-8') FROM 6); Spark_SQL > SELECT overlay(encode('Spark SQL', 'utf-8') PLACING encode('CORE', 'utf-8') FROM 7); Spark CORE > SELECT overlay(encode('Spark SQL', 'utf-8') PLACING encode('ANSI ', 'utf-8') FROM 7 FOR 0); Spark ANSI SQL > SELECT overlay(encode('Spark SQL', 'utf-8') PLACING encode('tructured', 'utf-8') FROM 2 FOR 4); Structured SQL Since: 3.0.0","title":"overlay"},{"location":"#parse_url","text":"parse_url(url, partToExtract[, key]) - Extracts a part from a URL. Examples: > SELECT parse_url('http://spark.apache.org/path?query=1', 'HOST'); spark.apache.org > SELECT parse_url('http://spark.apache.org/path?query=1', 'QUERY'); query=1 > SELECT parse_url('http://spark.apache.org/path?query=1', 'QUERY', 'query'); 1 Since: 2.0.0","title":"parse_url"},{"location":"#percent_rank","text":"percent_rank() - Computes the percentage ranking of a value in a group of values. Arguments: children - this is to base the rank on; a change in the value of one the children will trigger a change in rank. This is an internal parameter and will be assigned by the Analyser. Examples: > SELECT a, b, percent_rank(b) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 0.0 A1 1 0.0 A1 2 1.0 A2 3 0.0 Since: 2.0.0","title":"percent_rank"},{"location":"#percentile","text":"percentile(col, percentage [, frequency]) - Returns the exact percentile value of numeric column col at the given percentage. The value of percentage must be between 0.0 and 1.0. The value of frequency should be positive integral percentile(col, array(percentage1 [, percentage2]...) [, frequency]) - Returns the exact percentile value array of numeric column col at the given percentage(s). Each value of the percentage array must be between 0.0 and 1.0. The value of frequency should be positive integral Examples: > SELECT percentile(col, 0.3) FROM VALUES (0), (10) AS tab(col); 3.0 > SELECT percentile(col, array(0.25, 0.75)) FROM VALUES (0), (10) AS tab(col); [2.5,7.5] Since: 2.1.0","title":"percentile"},{"location":"#percentile_approx","text":"percentile_approx(col, percentage [, accuracy]) - Returns the approximate percentile of the numeric column col which is the smallest value in the ordered col values (sorted from least to greatest) such that no more than percentage of col values is less than the value or equal to that value. The value of percentage must be between 0.0 and 1.0. The accuracy parameter (default: 10000) is a positive numeric literal which controls approximation accuracy at the cost of memory. Higher value of accuracy yields better accuracy, 1.0/accuracy is the relative error of the approximation. When percentage is an array, each value of the percentage array must be between 0.0 and 1.0. In this case, returns the approximate percentile array of column col at the given percentage array. Examples: > SELECT percentile_approx(col, array(0.5, 0.4, 0.1), 100) FROM VALUES (0), (1), (2), (10) AS tab(col); [1,1,0] > SELECT percentile_approx(col, 0.5, 100) FROM VALUES (0), (6), (7), (9), (10) AS tab(col); 7 Since: 2.1.0","title":"percentile_approx"},{"location":"#pi","text":"pi() - Returns pi. Examples: > SELECT pi(); 3.141592653589793 Since: 1.5.0","title":"pi"},{"location":"#pmod","text":"pmod(expr1, expr2) - Returns the positive value of expr1 mod expr2 . Examples: > SELECT pmod(10, 3); 1 > SELECT pmod(-10, 3); 2 Since: 1.5.0","title":"pmod"},{"location":"#posexplode","text":"posexplode(expr) - Separates the elements of array expr into multiple rows with positions, or the elements of map expr into multiple rows and columns with positions. Unless specified otherwise, uses the column name pos for position, col for elements of the array or key and value for elements of the map. Examples: > SELECT posexplode(array(10,20)); 0 10 1 20 Since: 2.0.0","title":"posexplode"},{"location":"#posexplode_outer","text":"posexplode_outer(expr) - Separates the elements of array expr into multiple rows with positions, or the elements of map expr into multiple rows and columns with positions. Unless specified otherwise, uses the column name pos for position, col for elements of the array or key and value for elements of the map. Examples: > SELECT posexplode_outer(array(10,20)); 0 10 1 20 Since: 2.0.0","title":"posexplode_outer"},{"location":"#position","text":"position(substr, str[, pos]) - Returns the position of the first occurrence of substr in str after position pos . The given pos and return value are 1-based. Examples: > SELECT position('bar', 'foobarbar'); 4 > SELECT position('bar', 'foobarbar', 5); 7 > SELECT POSITION('bar' IN 'foobarbar'); 4 Since: 1.5.0","title":"position"},{"location":"#positive","text":"positive(expr) - Returns the value of expr . Examples: > SELECT positive(1); 1 Since: 1.5.0","title":"positive"},{"location":"#pow","text":"pow(expr1, expr2) - Raises expr1 to the power of expr2 . Examples: > SELECT pow(2, 3); 8.0 Since: 1.4.0","title":"pow"},{"location":"#power","text":"power(expr1, expr2) - Raises expr1 to the power of expr2 . Examples: > SELECT power(2, 3); 8.0 Since: 1.4.0","title":"power"},{"location":"#printf","text":"printf(strfmt, obj, ...) - Returns a formatted string from printf-style format strings. Examples: > SELECT printf(\"Hello World %d %s\", 100, \"days\"); Hello World 100 days Since: 1.5.0","title":"printf"},{"location":"#quarter","text":"quarter(date) - Returns the quarter of the year for date, in the range 1 to 4. Examples: > SELECT quarter('2016-08-31'); 3 Since: 1.5.0","title":"quarter"},{"location":"#radians","text":"radians(expr) - Converts degrees to radians. Arguments: expr - angle in degrees Examples: > SELECT radians(180); 3.141592653589793 Since: 1.4.0","title":"radians"},{"location":"#raise_error","text":"raise_error(expr) - Throws an exception with expr . Examples: > SELECT raise_error('custom error message'); java.lang.RuntimeException custom error message Since: 3.1.0","title":"raise_error"},{"location":"#rand","text":"rand([seed]) - Returns a random value with independent and identically distributed (i.i.d.) uniformly distributed values in [0, 1). Examples: > SELECT rand(); 0.9629742951434543 > SELECT rand(0); 0.8446490682263027 > SELECT rand(null); 0.8446490682263027 Note: The function is non-deterministic in general case. Since: 1.5.0","title":"rand"},{"location":"#randn","text":"randn([seed]) - Returns a random value with independent and identically distributed (i.i.d.) values drawn from the standard normal distribution. Examples: > SELECT randn(); -0.3254147983080288 > SELECT randn(0); 1.1164209726833079 > SELECT randn(null); 1.1164209726833079 Note: The function is non-deterministic in general case. Since: 1.5.0","title":"randn"},{"location":"#random","text":"random([seed]) - Returns a random value with independent and identically distributed (i.i.d.) uniformly distributed values in [0, 1). Examples: > SELECT random(); 0.9629742951434543 > SELECT random(0); 0.8446490682263027 > SELECT random(null); 0.8446490682263027 Note: The function is non-deterministic in general case. Since: 1.5.0","title":"random"},{"location":"#rank","text":"rank() - Computes the rank of a value in a group of values. The result is one plus the number of rows preceding or equal to the current row in the ordering of the partition. The values will produce gaps in the sequence. Arguments: children - this is to base the rank on; a change in the value of one the children will trigger a change in rank. This is an internal parameter and will be assigned by the Analyser. Examples: > SELECT a, b, rank(b) OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 1 A1 1 1 A1 2 3 A2 3 1 Since: 2.0.0","title":"rank"},{"location":"#reflect","text":"reflect(class, method[, arg1[, arg2 ..]]) - Calls a method with reflection. Examples: > SELECT reflect('java.util.UUID', 'randomUUID'); c33fb387-8500-4bfa-81d2-6e0e3e930df2 > SELECT reflect('java.util.UUID', 'fromString', 'a5cf6c42-0c85-418f-af6c-3e4e5b1328f2'); a5cf6c42-0c85-418f-af6c-3e4e5b1328f2 Since: 2.0.0","title":"reflect"},{"location":"#regexp_extract","text":"regexp_extract(str, regexp[, idx]) - Extract the first string in the str that match the regexp expression and corresponding to the regex group index. Arguments: str - a string expression. regexp - a string representing a regular expression. The regex string should be a Java regular expression. Since Spark 2.0, string literals (including regex patterns) are unescaped in our SQL parser. For example, to match \"\\abc\", a regular expression for regexp can be \"^\\abc$\". There is a SQL config 'spark.sql.parser.escapedStringLiterals' that can be used to fallback to the Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the regexp that can match \"\\abc\" is \"^\\abc$\". * idx - an integer expression that representing the group index. The regex maybe contains multiple groups. idx indicates which regex group to extract. The group index should be non-negative. The minimum value of idx is 0, which means matching the entire regular expression. If idx is not specified, the default group index value is 1. The idx parameter is the Java regex Matcher group() method index. Examples: > SELECT regexp_extract('100-200', '(\\\\d+)-(\\\\d+)', 1); 100 Since: 1.5.0","title":"regexp_extract"},{"location":"#regexp_extract_all","text":"regexp_extract_all(str, regexp[, idx]) - Extract all strings in the str that match the regexp expression and corresponding to the regex group index. Arguments: str - a string expression. regexp - a string representing a regular expression. The regex string should be a Java regular expression. Since Spark 2.0, string literals (including regex patterns) are unescaped in our SQL parser. For example, to match \"\\abc\", a regular expression for regexp can be \"^\\abc$\". There is a SQL config 'spark.sql.parser.escapedStringLiterals' that can be used to fallback to the Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the regexp that can match \"\\abc\" is \"^\\abc$\". * idx - an integer expression that representing the group index. The regex may contains multiple groups. idx indicates which regex group to extract. The group index should be non-negative. The minimum value of idx is 0, which means matching the entire regular expression. If idx is not specified, the default group index value is 1. The idx parameter is the Java regex Matcher group() method index. Examples: > SELECT regexp_extract_all('100-200, 300-400', '(\\\\d+)-(\\\\d+)', 1); [\"100\",\"300\"] Since: 3.1.0","title":"regexp_extract_all"},{"location":"#regexp_replace","text":"regexp_replace(str, regexp, rep[, position]) - Replaces all substrings of str that match regexp with rep . Arguments: str - a string expression to search for a regular expression pattern match. regexp - a string representing a regular expression. The regex string should be a Java regular expression. Since Spark 2.0, string literals (including regex patterns) are unescaped in our SQL parser. For example, to match \"\\abc\", a regular expression for regexp can be \"^\\abc$\". There is a SQL config 'spark.sql.parser.escapedStringLiterals' that can be used to fallback to the Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the regexp that can match \"\\abc\" is \"^\\abc$\". * rep - a string expression to replace matched substrings. * position - a positive integer literal that indicates the position within str to begin searching. The default is 1. If position is greater than the number of characters in str , the result is str . Examples: > SELECT regexp_replace('100-200', '(\\\\d+)', 'num'); num-num Since: 1.5.0","title":"regexp_replace"},{"location":"#repeat","text":"repeat(str, n) - Returns the string which repeats the given string value n times. Examples: > SELECT repeat('123', 2); 123123 Since: 1.5.0","title":"repeat"},{"location":"#replace","text":"replace(str, search[, replace]) - Replaces all occurrences of search with replace . Arguments: str - a string expression search - a string expression. If search is not found in str , str is returned unchanged. replace - a string expression. If replace is not specified or is an empty string, nothing replaces the string that is removed from str . Examples: > SELECT replace('ABCabc', 'abc', 'DEF'); ABCDEF Since: 2.3.0","title":"replace"},{"location":"#reverse","text":"reverse(array) - Returns a reversed string or an array with reverse order of elements. Examples: > SELECT reverse('Spark SQL'); LQS krapS > SELECT reverse(array(2, 1, 4, 3)); [3,4,1,2] Note: Reverse logic for arrays is available since 2.4.0. Since: 1.5.0","title":"reverse"},{"location":"#right","text":"right(str, len) - Returns the rightmost len ( len can be string type) characters from the string str ,if len is less or equal than 0 the result is an empty string. Examples: > SELECT right('Spark SQL', 3); SQL Since: 2.3.0","title":"right"},{"location":"#rint","text":"rint(expr) - Returns the double value that is closest in value to the argument and is equal to a mathematical integer. Examples: > SELECT rint(12.3456); 12.0 Since: 1.4.0","title":"rint"},{"location":"#rlike","text":"str rlike regexp - Returns true if str matches regexp , or false otherwise. Arguments: str - a string expression regexp - a string expression. The regex string should be a Java regular expression. Since Spark 2.0, string literals (including regex patterns) are unescaped in our SQL parser. For example, to match \"\\abc\", a regular expression for regexp can be \"^\\abc$\". There is a SQL config 'spark.sql.parser.escapedStringLiterals' that can be used to fallback to the Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the regexp that can match \"\\abc\" is \"^\\abc$\". Examples: > SET spark.sql.parser.escapedStringLiterals=true; spark.sql.parser.escapedStringLiterals true > SELECT '%SystemDrive%\\Users\\John' rlike '%SystemDrive%\\\\Users.*'; true > SET spark.sql.parser.escapedStringLiterals=false; spark.sql.parser.escapedStringLiterals false > SELECT '%SystemDrive%\\\\Users\\\\John' rlike '%SystemDrive%\\\\\\\\Users.*'; true Note: Use LIKE to match with simple string pattern. Since: 1.0.0","title":"rlike"},{"location":"#rollup","text":"rollup([col1[, col2 ..]]) - create a multi-dimensional rollup using the specified columns so that we can run aggregation on them. Examples: > SELECT name, age, count(*) FROM VALUES (2, 'Alice'), (5, 'Bob') people(age, name) GROUP BY rollup(name, age); Bob 5 1 Alice 2 1 Alice NULL 1 NULL NULL 2 Bob NULL 1 Since: 2.0.0","title":"rollup"},{"location":"#round","text":"round(expr, d) - Returns expr rounded to d decimal places using HALF_UP rounding mode. Examples: > SELECT round(2.5, 0); 3 Since: 1.5.0","title":"round"},{"location":"#row_number","text":"row_number() - Assigns a unique, sequential number to each row, starting with one, according to the ordering of rows within the window partition. Examples: > SELECT a, b, row_number() OVER (PARTITION BY a ORDER BY b) FROM VALUES ('A1', 2), ('A1', 1), ('A2', 3), ('A1', 1) tab(a, b); A1 1 1 A1 1 2 A1 2 3 A2 3 1 Since: 2.0.0","title":"row_number"},{"location":"#rpad","text":"rpad(str, len[, pad]) - Returns str , right-padded with pad to a length of len . If str is longer than len , the return value is shortened to len characters. If pad is not specified, str will be padded to the right with space characters. Examples: > SELECT rpad('hi', 5, '??'); hi??? > SELECT rpad('hi', 1, '??'); h > SELECT rpad('hi', 5); hi Since: 1.5.0","title":"rpad"},{"location":"#rtrim","text":"rtrim(str) - Removes the trailing space characters from str . Arguments: str - a string expression trimStr - the trim string characters to trim, the default value is a single space Examples: > SELECT rtrim(' SparkSQL '); SparkSQL Since: 1.5.0","title":"rtrim"},{"location":"#schema_of_csv","text":"schema_of_csv(csv[, options]) - Returns schema in the DDL format of CSV string. Examples: > SELECT schema_of_csv('1,abc'); STRUCT<`_c0`: INT, `_c1`: STRING> Since: 3.0.0","title":"schema_of_csv"},{"location":"#schema_of_json","text":"schema_of_json(json[, options]) - Returns schema in the DDL format of JSON string. Examples: > SELECT schema_of_json('[{\"col\":0}]'); ARRAY<STRUCT<`col`: BIGINT>> > SELECT schema_of_json('[{\"col\":01}]', map('allowNumericLeadingZeros', 'true')); ARRAY<STRUCT<`col`: BIGINT>> Since: 2.4.0","title":"schema_of_json"},{"location":"#second","text":"second(timestamp) - Returns the second component of the string/timestamp. Examples: > SELECT second('2009-07-30 12:58:59'); 59 Since: 1.5.0","title":"second"},{"location":"#sentences","text":"sentences(str[, lang, country]) - Splits str into an array of array of words. Examples: > SELECT sentences('Hi there! Good morning.'); [[\"Hi\",\"there\"],[\"Good\",\"morning\"]] Since: 2.0.0","title":"sentences"},{"location":"#sequence","text":"sequence(start, stop, step) - Generates an array of elements from start to stop (inclusive), incrementing by step. The type of the returned elements is the same as the type of argument expressions. Supported types are: byte, short, integer, long, date, timestamp. The start and stop expressions must resolve to the same type. If start and stop expressions resolve to the 'date' or 'timestamp' type then the step expression must resolve to the 'interval' type, otherwise to the same type as the start and stop expressions. Arguments: start - an expression. The start of the range. stop - an expression. The end the range (inclusive). step - an optional expression. The step of the range. By default step is 1 if start is less than or equal to stop, otherwise -1. For the temporal sequences it's 1 day and -1 day respectively. If start is greater than stop then the step must be negative, and vice versa. Examples: > SELECT sequence(1, 5); [1,2,3,4,5] > SELECT sequence(5, 1); [5,4,3,2,1] > SELECT sequence(to_date('2018-01-01'), to_date('2018-03-01'), interval 1 month); [2018-01-01,2018-02-01,2018-03-01] Since: 2.4.0","title":"sequence"},{"location":"#sha","text":"sha(expr) - Returns a sha1 hash value as a hex string of the expr . Examples: > SELECT sha('Spark'); 85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c Since: 1.5.0","title":"sha"},{"location":"#sha1","text":"sha1(expr) - Returns a sha1 hash value as a hex string of the expr . Examples: > SELECT sha1('Spark'); 85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c Since: 1.5.0","title":"sha1"},{"location":"#sha2","text":"sha2(expr, bitLength) - Returns a checksum of SHA-2 family as a hex string of expr . SHA-224, SHA-256, SHA-384, and SHA-512 are supported. Bit length of 0 is equivalent to 256. Examples: > SELECT sha2('Spark', 256); 529bc3b07127ecb7e53a4dcf1991d9152c24537d919178022b2c42657f79a26b Since: 1.5.0","title":"sha2"},{"location":"#shiftleft","text":"shiftleft(base, expr) - Bitwise left shift. Examples: > SELECT shiftleft(2, 1); 4 Since: 1.5.0","title":"shiftleft"},{"location":"#shiftright","text":"shiftright(base, expr) - Bitwise (signed) right shift. Examples: > SELECT shiftright(4, 1); 2 Since: 1.5.0","title":"shiftright"},{"location":"#shiftrightunsigned","text":"shiftrightunsigned(base, expr) - Bitwise unsigned right shift. Examples: > SELECT shiftrightunsigned(4, 1); 2 Since: 1.5.0","title":"shiftrightunsigned"},{"location":"#shuffle","text":"shuffle(array) - Returns a random permutation of the given array. Examples: > SELECT shuffle(array(1, 20, 3, 5)); [3,1,5,20] > SELECT shuffle(array(1, 20, null, 3)); [20,null,3,1] Note: The function is non-deterministic. Since: 2.4.0","title":"shuffle"},{"location":"#sign","text":"sign(expr) - Returns -1.0, 0.0 or 1.0 as expr is negative, 0 or positive. Examples: > SELECT sign(40); 1.0 Since: 1.4.0","title":"sign"},{"location":"#signum","text":"signum(expr) - Returns -1.0, 0.0 or 1.0 as expr is negative, 0 or positive. Examples: > SELECT signum(40); 1.0 Since: 1.4.0","title":"signum"},{"location":"#sin","text":"sin(expr) - Returns the sine of expr , as if computed by java.lang.Math.sin . Arguments: expr - angle in radians Examples: > SELECT sin(0); 0.0 Since: 1.4.0","title":"sin"},{"location":"#sinh","text":"sinh(expr) - Returns hyperbolic sine of expr , as if computed by java.lang.Math.sinh . Arguments: expr - hyperbolic angle Examples: > SELECT sinh(0); 0.0 Since: 1.4.0","title":"sinh"},{"location":"#size","text":"size(expr) - Returns the size of an array or a map. The function returns null for null input if spark.sql.legacy.sizeOfNull is set to false or spark.sql.ansi.enabled is set to true. Otherwise, the function returns -1 for null input. With the default settings, the function returns -1 for null input. Examples: > SELECT size(array('b', 'd', 'c', 'a')); 4 > SELECT size(map('a', 1, 'b', 2)); 2 > SELECT size(NULL); -1 Since: 1.5.0","title":"size"},{"location":"#skewness","text":"skewness(expr) - Returns the skewness value calculated from values of a group. Examples: > SELECT skewness(col) FROM VALUES (-10), (-20), (100), (1000) AS tab(col); 1.1135657469022011 > SELECT skewness(col) FROM VALUES (-1000), (-100), (10), (20) AS tab(col); -1.1135657469022011 Since: 1.6.0","title":"skewness"},{"location":"#slice","text":"slice(x, start, length) - Subsets array x starting from index start (array indices start at 1, or starting from the end if start is negative) with the specified length. Examples: > SELECT slice(array(1, 2, 3, 4), 2, 2); [2,3] > SELECT slice(array(1, 2, 3, 4), -2, 2); [3,4] Since: 2.4.0","title":"slice"},{"location":"#smallint","text":"smallint(expr) - Casts the value expr to the target data type smallint . Since: 2.0.1","title":"smallint"},{"location":"#some","text":"some(expr) - Returns true if at least one value of expr is true. Examples: > SELECT some(col) FROM VALUES (true), (false), (false) AS tab(col); true > SELECT some(col) FROM VALUES (NULL), (true), (false) AS tab(col); true > SELECT some(col) FROM VALUES (false), (false), (NULL) AS tab(col); false Since: 3.0.0","title":"some"},{"location":"#sort_array","text":"sort_array(array[, ascendingOrder]) - Sorts the input array in ascending or descending order according to the natural ordering of the array elements. Null elements will be placed at the beginning of the returned array in ascending order or at the end of the returned array in descending order. Examples: > SELECT sort_array(array('b', 'd', null, 'c', 'a'), true); [null,\"a\",\"b\",\"c\",\"d\"] Since: 1.5.0","title":"sort_array"},{"location":"#soundex","text":"soundex(str) - Returns Soundex code of the string. Examples: > SELECT soundex('Miller'); M460 Since: 1.5.0","title":"soundex"},{"location":"#space","text":"space(n) - Returns a string consisting of n spaces. Examples: > SELECT concat(space(2), '1'); 1 Since: 1.5.0","title":"space"},{"location":"#spark_partition_id","text":"spark_partition_id() - Returns the current partition id. Examples: > SELECT spark_partition_id(); 0 Since: 1.4.0","title":"spark_partition_id"},{"location":"#split","text":"split(str, regex, limit) - Splits str around occurrences that match regex and returns an array with a length of at most limit Arguments: str - a string expression to split. regex - a string representing a regular expression. The regex string should be a Java regular expression. limit - an integer expression which controls the number of times the regex is applied. limit > 0: The resulting array's length will not be more than limit , and the resulting array's last entry will contain all input beyond the last matched regex. limit <= 0: regex will be applied as many times as possible, and the resulting array can be of any size. Examples: > SELECT split('oneAtwoBthreeC', '[ABC]'); [\"one\",\"two\",\"three\",\"\"] > SELECT split('oneAtwoBthreeC', '[ABC]', -1); [\"one\",\"two\",\"three\",\"\"] > SELECT split('oneAtwoBthreeC', '[ABC]', 2); [\"one\",\"twoBthreeC\"] Since: 1.5.0","title":"split"},{"location":"#sqrt","text":"sqrt(expr) - Returns the square root of expr . Examples: > SELECT sqrt(4); 2.0 Since: 1.1.1","title":"sqrt"},{"location":"#stack","text":"stack(n, expr1, ..., exprk) - Separates expr1 , ..., exprk into n rows. Uses column names col0, col1, etc. by default unless specified otherwise. Examples: > SELECT stack(2, 1, 2, 3); 1 2 3 NULL Since: 2.0.0","title":"stack"},{"location":"#std","text":"std(expr) - Returns the sample standard deviation calculated from values of a group. Examples: > SELECT std(col) FROM VALUES (1), (2), (3) AS tab(col); 1.0 Since: 1.6.0","title":"std"},{"location":"#stddev","text":"stddev(expr) - Returns the sample standard deviation calculated from values of a group. Examples: > SELECT stddev(col) FROM VALUES (1), (2), (3) AS tab(col); 1.0 Since: 1.6.0","title":"stddev"},{"location":"#stddev_pop","text":"stddev_pop(expr) - Returns the population standard deviation calculated from values of a group. Examples: > SELECT stddev_pop(col) FROM VALUES (1), (2), (3) AS tab(col); 0.816496580927726 Since: 1.6.0","title":"stddev_pop"},{"location":"#stddev_samp","text":"stddev_samp(expr) - Returns the sample standard deviation calculated from values of a group. Examples: > SELECT stddev_samp(col) FROM VALUES (1), (2), (3) AS tab(col); 1.0 Since: 1.6.0","title":"stddev_samp"},{"location":"#str_to_map","text":"str_to_map(text[, pairDelim[, keyValueDelim]]) - Creates a map after splitting the text into key/value pairs using delimiters. Default delimiters are ',' for pairDelim and ':' for keyValueDelim . Both pairDelim and keyValueDelim are treated as regular expressions. Examples: > SELECT str_to_map('a:1,b:2,c:3', ',', ':'); {\"a\":\"1\",\"b\":\"2\",\"c\":\"3\"} > SELECT str_to_map('a'); {\"a\":null} Since: 2.0.1","title":"str_to_map"},{"location":"#string","text":"string(expr) - Casts the value expr to the target data type string . Since: 2.0.1","title":"string"},{"location":"#struct","text":"struct(col1, col2, col3, ...) - Creates a struct with the given field values. Examples: > SELECT struct(1, 2, 3); {\"col1\":1,\"col2\":2,\"col3\":3} Since: 1.4.0","title":"struct"},{"location":"#substr","text":"substr(str, pos[, len]) - Returns the substring of str that starts at pos and is of length len , or the slice of byte array that starts at pos and is of length len . substr(str FROM pos[ FOR len]]) - Returns the substring of str that starts at pos and is of length len , or the slice of byte array that starts at pos and is of length len . Examples: > SELECT substr('Spark SQL', 5); k SQL > SELECT substr('Spark SQL', -3); SQL > SELECT substr('Spark SQL', 5, 1); k > SELECT substr('Spark SQL' FROM 5); k SQL > SELECT substr('Spark SQL' FROM -3); SQL > SELECT substr('Spark SQL' FROM 5 FOR 1); k Since: 1.5.0","title":"substr"},{"location":"#substring","text":"substring(str, pos[, len]) - Returns the substring of str that starts at pos and is of length len , or the slice of byte array that starts at pos and is of length len . substring(str FROM pos[ FOR len]]) - Returns the substring of str that starts at pos and is of length len , or the slice of byte array that starts at pos and is of length len . Examples: > SELECT substring('Spark SQL', 5); k SQL > SELECT substring('Spark SQL', -3); SQL > SELECT substring('Spark SQL', 5, 1); k > SELECT substring('Spark SQL' FROM 5); k SQL > SELECT substring('Spark SQL' FROM -3); SQL > SELECT substring('Spark SQL' FROM 5 FOR 1); k Since: 1.5.0","title":"substring"},{"location":"#substring_index","text":"substring_index(str, delim, count) - Returns the substring from str before count occurrences of the delimiter delim . If count is positive, everything to the left of the final delimiter (counting from the left) is returned. If count is negative, everything to the right of the final delimiter (counting from the right) is returned. The function substring_index performs a case-sensitive match when searching for delim . Examples: > SELECT substring_index('www.apache.org', '.', 2); www.apache Since: 1.5.0","title":"substring_index"},{"location":"#sum","text":"sum(expr) - Returns the sum calculated from values of a group. Examples: > SELECT sum(col) FROM VALUES (5), (10), (15) AS tab(col); 30 > SELECT sum(col) FROM VALUES (NULL), (10), (15) AS tab(col); 25 > SELECT sum(col) FROM VALUES (NULL), (NULL) AS tab(col); NULL Since: 1.0.0","title":"sum"},{"location":"#tan","text":"tan(expr) - Returns the tangent of expr , as if computed by java.lang.Math.tan . Arguments: expr - angle in radians Examples: > SELECT tan(0); 0.0 Since: 1.4.0","title":"tan"},{"location":"#tanh","text":"tanh(expr) - Returns the hyperbolic tangent of expr , as if computed by java.lang.Math.tanh . Arguments: expr - hyperbolic angle Examples: > SELECT tanh(0); 0.0 Since: 1.4.0","title":"tanh"},{"location":"#timestamp","text":"timestamp(expr) - Casts the value expr to the target data type timestamp . Since: 2.0.1","title":"timestamp"},{"location":"#timestamp_micros","text":"timestamp_micros(microseconds) - Creates timestamp from the number of microseconds since UTC epoch. Examples: > SELECT timestamp_micros(1230219000123123); 2008-12-25 07:30:00.123123 Since: 3.1.0","title":"timestamp_micros"},{"location":"#timestamp_millis","text":"timestamp_millis(milliseconds) - Creates timestamp from the number of milliseconds since UTC epoch. Examples: > SELECT timestamp_millis(1230219000123); 2008-12-25 07:30:00.123 Since: 3.1.0","title":"timestamp_millis"},{"location":"#timestamp_seconds","text":"timestamp_seconds(seconds) - Creates timestamp from the number of seconds (can be fractional) since UTC epoch. Examples: > SELECT timestamp_seconds(1230219000); 2008-12-25 07:30:00 > SELECT timestamp_seconds(1230219000.123); 2008-12-25 07:30:00.123 Since: 3.1.0","title":"timestamp_seconds"},{"location":"#tinyint","text":"tinyint(expr) - Casts the value expr to the target data type tinyint . Since: 2.0.1","title":"tinyint"},{"location":"#to_csv","text":"to_csv(expr[, options]) - Returns a CSV string with a given struct value Examples: > SELECT to_csv(named_struct('a', 1, 'b', 2)); 1,2 > SELECT to_csv(named_struct('time', to_timestamp('2015-08-26', 'yyyy-MM-dd')), map('timestampFormat', 'dd/MM/yyyy')); 26/08/2015 Since: 3.0.0","title":"to_csv"},{"location":"#to_date","text":"to_date(date_str[, fmt]) - Parses the date_str expression with the fmt expression to a date. Returns null with invalid input. By default, it follows casting rules to a date if the fmt is omitted. Arguments: date_str - A string to be parsed to date. fmt - Date format pattern to follow. See Datetime Patterns for valid date and time format patterns. Examples: > SELECT to_date('2009-07-30 04:17:52'); 2009-07-30 > SELECT to_date('2016-12-31', 'yyyy-MM-dd'); 2016-12-31 Since: 1.5.0","title":"to_date"},{"location":"#to_json","text":"to_json(expr[, options]) - Returns a JSON string with a given struct value Examples: > SELECT to_json(named_struct('a', 1, 'b', 2)); {\"a\":1,\"b\":2} > SELECT to_json(named_struct('time', to_timestamp('2015-08-26', 'yyyy-MM-dd')), map('timestampFormat', 'dd/MM/yyyy')); {\"time\":\"26/08/2015\"} > SELECT to_json(array(named_struct('a', 1, 'b', 2))); [{\"a\":1,\"b\":2}] > SELECT to_json(map('a', named_struct('b', 1))); {\"a\":{\"b\":1}} > SELECT to_json(map(named_struct('a', 1),named_struct('b', 2))); {\"[1]\":{\"b\":2}} > SELECT to_json(map('a', 1)); {\"a\":1} > SELECT to_json(array((map('a', 1)))); [{\"a\":1}] Since: 2.2.0","title":"to_json"},{"location":"#to_timestamp","text":"to_timestamp(timestamp_str[, fmt]) - Parses the timestamp_str expression with the fmt expression to a timestamp. Returns null with invalid input. By default, it follows casting rules to a timestamp if the fmt is omitted. Arguments: timestamp_str - A string to be parsed to timestamp. fmt - Timestamp format pattern to follow. See Datetime Patterns for valid date and time format patterns. Examples: > SELECT to_timestamp('2016-12-31 00:12:00'); 2016-12-31 00:12:00 > SELECT to_timestamp('2016-12-31', 'yyyy-MM-dd'); 2016-12-31 00:00:00 Since: 2.2.0","title":"to_timestamp"},{"location":"#to_unix_timestamp","text":"to_unix_timestamp(timeExp[, fmt]) - Returns the UNIX timestamp of the given time. Arguments: timeExp - A date/timestamp or string which is returned as a UNIX timestamp. fmt - Date/time format pattern to follow. Ignored if timeExp is not a string. Default value is \"yyyy-MM-dd HH:mm:ss\". See Datetime Patterns for valid date and time format patterns. Examples: > SELECT to_unix_timestamp('2016-04-08', 'yyyy-MM-dd'); 1460098800 Since: 1.6.0","title":"to_unix_timestamp"},{"location":"#to_utc_timestamp","text":"to_utc_timestamp(timestamp, timezone) - Given a timestamp like '2017-07-14 02:40:00.0', interprets it as a time in the given time zone, and renders that time as a timestamp in UTC. For example, 'GMT+1' would yield '2017-07-14 01:40:00.0'. Examples: > SELECT to_utc_timestamp('2016-08-31', 'Asia/Seoul'); 2016-08-30 15:00:00 Since: 1.5.0","title":"to_utc_timestamp"},{"location":"#transform","text":"transform(expr, func) - Transforms elements in an array using the function. Examples: > SELECT transform(array(1, 2, 3), x -> x + 1); [2,3,4] > SELECT transform(array(1, 2, 3), (x, i) -> x + i); [1,3,5] Since: 2.4.0","title":"transform"},{"location":"#transform_keys","text":"transform_keys(expr, func) - Transforms elements in a map using the function. Examples: > SELECT transform_keys(map_from_arrays(array(1, 2, 3), array(1, 2, 3)), (k, v) -> k + 1); {2:1,3:2,4:3} > SELECT transform_keys(map_from_arrays(array(1, 2, 3), array(1, 2, 3)), (k, v) -> k + v); {2:1,4:2,6:3} Since: 3.0.0","title":"transform_keys"},{"location":"#transform_values","text":"transform_values(expr, func) - Transforms values in the map using the function. Examples: > SELECT transform_values(map_from_arrays(array(1, 2, 3), array(1, 2, 3)), (k, v) -> v + 1); {1:2,2:3,3:4} > SELECT transform_values(map_from_arrays(array(1, 2, 3), array(1, 2, 3)), (k, v) -> k + v); {1:2,2:4,3:6} Since: 3.0.0","title":"transform_values"},{"location":"#translate","text":"translate(input, from, to) - Translates the input string by replacing the characters present in the from string with the corresponding characters in the to string. Examples: > SELECT translate('AaBbCc', 'abc', '123'); A1B2C3 Since: 1.5.0","title":"translate"},{"location":"#trim","text":"trim(str) - Removes the leading and trailing space characters from str . trim(BOTH FROM str) - Removes the leading and trailing space characters from str . trim(LEADING FROM str) - Removes the leading space characters from str . trim(TRAILING FROM str) - Removes the trailing space characters from str . trim(trimStr FROM str) - Remove the leading and trailing trimStr characters from str . trim(BOTH trimStr FROM str) - Remove the leading and trailing trimStr characters from str . trim(LEADING trimStr FROM str) - Remove the leading trimStr characters from str . trim(TRAILING trimStr FROM str) - Remove the trailing trimStr characters from str . Arguments: str - a string expression trimStr - the trim string characters to trim, the default value is a single space BOTH, FROM - these are keywords to specify trimming string characters from both ends of the string LEADING, FROM - these are keywords to specify trimming string characters from the left end of the string TRAILING, FROM - these are keywords to specify trimming string characters from the right end of the string Examples: > SELECT trim(' SparkSQL '); SparkSQL > SELECT trim(BOTH FROM ' SparkSQL '); SparkSQL > SELECT trim(LEADING FROM ' SparkSQL '); SparkSQL > SELECT trim(TRAILING FROM ' SparkSQL '); SparkSQL > SELECT trim('SL' FROM 'SSparkSQLS'); parkSQ > SELECT trim(BOTH 'SL' FROM 'SSparkSQLS'); parkSQ > SELECT trim(LEADING 'SL' FROM 'SSparkSQLS'); parkSQLS > SELECT trim(TRAILING 'SL' FROM 'SSparkSQLS'); SSparkSQ Since: 1.5.0","title":"trim"},{"location":"#trunc","text":"trunc(date, fmt) - Returns date with the time portion of the day truncated to the unit specified by the format model fmt . Arguments: date - date value or valid date string fmt - the format representing the unit to be truncated to \"YEAR\", \"YYYY\", \"YY\" - truncate to the first date of the year that the date falls in \"QUARTER\" - truncate to the first date of the quarter that the date falls in \"MONTH\", \"MM\", \"MON\" - truncate to the first date of the month that the date falls in \"WEEK\" - truncate to the Monday of the week that the date falls in Examples: > SELECT trunc('2019-08-04', 'week'); 2019-07-29 > SELECT trunc('2019-08-04', 'quarter'); 2019-07-01 > SELECT trunc('2009-02-12', 'MM'); 2009-02-01 > SELECT trunc('2015-10-27', 'YEAR'); 2015-01-01 Since: 1.5.0","title":"trunc"},{"location":"#typeof","text":"typeof(expr) - Return DDL-formatted type string for the data type of the input. Examples: > SELECT typeof(1); int > SELECT typeof(array(1)); array<int> Since: 3.0.0","title":"typeof"},{"location":"#ucase","text":"ucase(str) - Returns str with all characters changed to uppercase. Examples: > SELECT ucase('SparkSql'); SPARKSQL Since: 1.0.1","title":"ucase"},{"location":"#unbase64","text":"unbase64(str) - Converts the argument from a base 64 string str to a binary. Examples: > SELECT unbase64('U3BhcmsgU1FM'); Spark SQL Since: 1.5.0","title":"unbase64"},{"location":"#unhex","text":"unhex(expr) - Converts hexadecimal expr to binary. Examples: > SELECT decode(unhex('537061726B2053514C'), 'UTF-8'); Spark SQL Since: 1.5.0","title":"unhex"},{"location":"#unix_date","text":"unix_date(date) - Returns the number of days since 1970-01-01. Examples: > SELECT unix_date(DATE(\"1970-01-02\")); 1 Since: 3.1.0","title":"unix_date"},{"location":"#unix_micros","text":"unix_micros(timestamp) - Returns the number of microseconds since 1970-01-01 00:00:00 UTC. Examples: > SELECT unix_micros(TIMESTAMP('1970-01-01 00:00:01Z')); 1000000 Since: 3.1.0","title":"unix_micros"},{"location":"#unix_millis","text":"unix_millis(timestamp) - Returns the number of milliseconds since 1970-01-01 00:00:00 UTC. Truncates higher levels of precision. Examples: > SELECT unix_millis(TIMESTAMP('1970-01-01 00:00:01Z')); 1000 Since: 3.1.0","title":"unix_millis"},{"location":"#unix_seconds","text":"unix_seconds(timestamp) - Returns the number of seconds since 1970-01-01 00:00:00 UTC. Truncates higher levels of precision. Examples: > SELECT unix_seconds(TIMESTAMP('1970-01-01 00:00:01Z')); 1 Since: 3.1.0","title":"unix_seconds"},{"location":"#unix_timestamp","text":"unix_timestamp([timeExp[, fmt]]) - Returns the UNIX timestamp of current or specified time. Arguments: timeExp - A date/timestamp or string. If not provided, this defaults to current time. fmt - Date/time format pattern to follow. Ignored if timeExp is not a string. Default value is \"yyyy-MM-dd HH:mm:ss\". See Datetime Patterns for valid date and time format patterns. Examples: > SELECT unix_timestamp(); 1476884637 > SELECT unix_timestamp('2016-04-08', 'yyyy-MM-dd'); 1460041200 Since: 1.5.0","title":"unix_timestamp"},{"location":"#upper","text":"upper(str) - Returns str with all characters changed to uppercase. Examples: > SELECT upper('SparkSql'); SPARKSQL Since: 1.0.1","title":"upper"},{"location":"#uuid","text":"uuid() - Returns an universally unique identifier (UUID) string. The value is returned as a canonical UUID 36-character string. Examples: > SELECT uuid(); 46707d92-02f4-4817-8116-a4c3b23e6266 Note: The function is non-deterministic. Since: 2.3.0","title":"uuid"},{"location":"#var_pop","text":"var_pop(expr) - Returns the population variance calculated from values of a group. Examples: > SELECT var_pop(col) FROM VALUES (1), (2), (3) AS tab(col); 0.6666666666666666 Since: 1.6.0","title":"var_pop"},{"location":"#var_samp","text":"var_samp(expr) - Returns the sample variance calculated from values of a group. Examples: > SELECT var_samp(col) FROM VALUES (1), (2), (3) AS tab(col); 1.0 Since: 1.6.0","title":"var_samp"},{"location":"#variance","text":"variance(expr) - Returns the sample variance calculated from values of a group. Examples: > SELECT variance(col) FROM VALUES (1), (2), (3) AS tab(col); 1.0 Since: 1.6.0","title":"variance"},{"location":"#version","text":"version() - Returns the Spark version. The string contains 2 fields, the first being a release version and the second being a git revision. Examples: > SELECT version(); 3.1.0 a6d6ea3efedbad14d99c24143834cd4e2e52fb40 Since: 3.0.0","title":"version"},{"location":"#weekday","text":"weekday(date) - Returns the day of the week for date/timestamp (0 = Monday, 1 = Tuesday, ..., 6 = Sunday). Examples: > SELECT weekday('2009-07-30'); 3 Since: 2.4.0","title":"weekday"},{"location":"#weekofyear","text":"weekofyear(date) - Returns the week of the year of the given date. A week is considered to start on a Monday and week 1 is the first week with >3 days. Examples: > SELECT weekofyear('2008-02-20'); 8 Since: 1.5.0","title":"weekofyear"},{"location":"#when","text":"CASE WHEN expr1 THEN expr2 [WHEN expr3 THEN expr4]* [ELSE expr5] END - When expr1 = true, returns expr2 ; else when expr3 = true, returns expr4 ; else returns expr5 . Arguments: expr1, expr3 - the branch condition expressions should all be boolean type. expr2, expr4, expr5 - the branch value expressions and else value expression should all be same type or coercible to a common type. Examples: > SELECT CASE WHEN 1 > 0 THEN 1 WHEN 2 > 0 THEN 2.0 ELSE 1.2 END; 1.0 > SELECT CASE WHEN 1 < 0 THEN 1 WHEN 2 > 0 THEN 2.0 ELSE 1.2 END; 2.0 > SELECT CASE WHEN 1 < 0 THEN 1 WHEN 2 < 0 THEN 2.0 END; NULL Since: 1.0.1","title":"when"},{"location":"#width_bucket","text":"width_bucket(value, min_value, max_value, num_bucket) - Returns the bucket number to which value would be assigned in an equiwidth histogram with num_bucket buckets, in the range min_value to max_value .\" Examples: > SELECT width_bucket(5.3, 0.2, 10.6, 5); 3 > SELECT width_bucket(-2.1, 1.3, 3.4, 3); 0 > SELECT width_bucket(8.1, 0.0, 5.7, 4); 5 > SELECT width_bucket(-0.9, 5.2, 0.5, 2); 3 Since: 3.1.0","title":"width_bucket"},{"location":"#window","text":"N/A.","title":"window"},{"location":"#xpath","text":"xpath(xml, xpath) - Returns a string array of values within the nodes of xml that match the XPath expression. Examples: > SELECT xpath('<a><b>b1</b><b>b2</b><b>b3</b><c>c1</c><c>c2</c></a>','a/b/text()'); [\"b1\",\"b2\",\"b3\"] Since: 2.0.0","title":"xpath"},{"location":"#xpath_boolean","text":"xpath_boolean(xml, xpath) - Returns true if the XPath expression evaluates to true, or if a matching node is found. Examples: > SELECT xpath_boolean('<a><b>1</b></a>','a/b'); true Since: 2.0.0","title":"xpath_boolean"},{"location":"#xpath_double","text":"xpath_double(xml, xpath) - Returns a double value, the value zero if no match is found, or NaN if a match is found but the value is non-numeric. Examples: > SELECT xpath_double('<a><b>1</b><b>2</b></a>', 'sum(a/b)'); 3.0 Since: 2.0.0","title":"xpath_double"},{"location":"#xpath_float","text":"xpath_float(xml, xpath) - Returns a float value, the value zero if no match is found, or NaN if a match is found but the value is non-numeric. Examples: > SELECT xpath_float('<a><b>1</b><b>2</b></a>', 'sum(a/b)'); 3.0 Since: 2.0.0","title":"xpath_float"},{"location":"#xpath_int","text":"xpath_int(xml, xpath) - Returns an integer value, or the value zero if no match is found, or a match is found but the value is non-numeric. Examples: > SELECT xpath_int('<a><b>1</b><b>2</b></a>', 'sum(a/b)'); 3 Since: 2.0.0","title":"xpath_int"},{"location":"#xpath_long","text":"xpath_long(xml, xpath) - Returns a long integer value, or the value zero if no match is found, or a match is found but the value is non-numeric. Examples: > SELECT xpath_long('<a><b>1</b><b>2</b></a>', 'sum(a/b)'); 3 Since: 2.0.0","title":"xpath_long"},{"location":"#xpath_number","text":"xpath_number(xml, xpath) - Returns a double value, the value zero if no match is found, or NaN if a match is found but the value is non-numeric. Examples: > SELECT xpath_number('<a><b>1</b><b>2</b></a>', 'sum(a/b)'); 3.0 Since: 2.0.0","title":"xpath_number"},{"location":"#xpath_short","text":"xpath_short(xml, xpath) - Returns a short integer value, or the value zero if no match is found, or a match is found but the value is non-numeric. Examples: > SELECT xpath_short('<a><b>1</b><b>2</b></a>', 'sum(a/b)'); 3 Since: 2.0.0","title":"xpath_short"},{"location":"#xpath_string","text":"xpath_string(xml, xpath) - Returns the text contents of the first xml node that matches the XPath expression. Examples: > SELECT xpath_string('<a><b>b</b><c>cc</c></a>','a/c'); cc Since: 2.0.0","title":"xpath_string"},{"location":"#xxhash64","text":"xxhash64(expr1, expr2, ...) - Returns a 64-bit hash value of the arguments. Examples: > SELECT xxhash64('Spark', array(123), 2); 5602566077635097486 Since: 3.0.0","title":"xxhash64"},{"location":"#year","text":"year(date) - Returns the year component of the date/timestamp. Examples: > SELECT year('2016-07-30'); 2016 Since: 1.5.0","title":"year"},{"location":"#zip_with","text":"zip_with(left, right, func) - Merges the two given arrays, element-wise, into a single array using function. If one array is shorter, nulls are appended at the end to match the length of the longer array, before applying function. Examples: > SELECT zip_with(array(1, 2, 3), array('a', 'b', 'c'), (x, y) -> (y, x)); [{\"y\":\"a\",\"x\":1},{\"y\":\"b\",\"x\":2},{\"y\":\"c\",\"x\":3}] > SELECT zip_with(array(1, 2), array(3, 4), (x, y) -> x + y); [4,6] > SELECT zip_with(array('a', 'b', 'c'), array('d', 'e', 'f'), (x, y) -> concat(x, y)); [\"ad\",\"be\",\"cf\"] Since: 2.4.0","title":"zip_with"},{"location":"#_15","text":"expr1 | expr2 - Returns the result of bitwise OR of expr1 and expr2 . Examples: > SELECT 3 | 5; 7 Since: 1.4.0","title":"|"},{"location":"#_16","text":"~ expr - Returns the result of bitwise NOT of expr . Examples: > SELECT ~ 0; -1 Since: 1.4.0","title":"~"}]}