{
    "docs": [
        {
            "location": "/",
            "text": "!\n\n\n! expr - Logical not.\n\n\n\n\n%\n\n\nexpr1 % expr2 - Returns the remainder after \nexpr1\n/\nexpr2\n.\n\n\nExamples:\n\n\n> SELECT 2 % 1.8;\n 0.2\n> SELECT MOD(2, 1.8);\n 0.2\n\n\n\n\n\n\n&\n\n\nexpr1 & expr2 - Returns the result of bitwise AND of \nexpr1\n and \nexpr2\n.\n\n\nExamples:\n\n\n> SELECT 3 & 5;\n 1\n\n\n\n\n\n\n*\n\n\nexpr1 * expr2 - Returns \nexpr1\n*\nexpr2\n.\n\n\nExamples:\n\n\n> SELECT 2 * 3;\n 6\n\n\n\n\n\n\n+\n\n\nexpr1 + expr2 - Returns \nexpr1\n+\nexpr2\n.\n\n\nExamples:\n\n\n> SELECT 1 + 2;\n 3\n\n\n\n\n\n\n-\n\n\nexpr1 - expr2 - Returns \nexpr1\n-\nexpr2\n.\n\n\nExamples:\n\n\n> SELECT 2 - 1;\n 1\n\n\n\n\n\n\n/\n\n\nexpr1 / expr2 - Returns \nexpr1\n/\nexpr2\n. It always performs floating point division.\n\n\nExamples:\n\n\n> SELECT 3 / 2;\n 1.5\n> SELECT 2L / 2L;\n 1.0\n\n\n\n\n\n\n<\n\n\nexpr1 < expr2 - Returns true if \nexpr1\n is less than \nexpr2\n.\n\n\nArguments:\n\n\n\n\nexpr1, expr2 - the two expressions must be same type or can be casted to a common type,\n    and must be a type that can be ordered. For example, map type is not orderable, so it\n    is not supported. For complex types such array/struct, the data types of fields must\n    be orderable.\n\n\n\n\nExamples:\n\n\n> SELECT 1 < 2;\n true\n> SELECT 1.1 < '1';\n false\n> SELECT to_date('2009-07-30 04:17:52') < to_date('2009-07-30 04:17:52');\n false\n> SELECT to_date('2009-07-30 04:17:52') < to_date('2009-08-01 04:17:52');\n true\n> SELECT 1 < NULL;\n NULL\n\n\n\n\n\n\n<=\n\n\nexpr1 <= expr2 - Returns true if \nexpr1\n is less than or equal to \nexpr2\n.\n\n\nArguments:\n\n\n\n\nexpr1, expr2 - the two expressions must be same type or can be casted to a common type,\n    and must be a type that can be ordered. For example, map type is not orderable, so it\n    is not supported. For complex types such array/struct, the data types of fields must\n    be orderable.\n\n\n\n\nExamples:\n\n\n> SELECT 2 <= 2;\n true\n> SELECT 1.0 <= '1';\n true\n> SELECT to_date('2009-07-30 04:17:52') <= to_date('2009-07-30 04:17:52');\n true\n> SELECT to_date('2009-07-30 04:17:52') <= to_date('2009-08-01 04:17:52');\n true\n> SELECT 1 <= NULL;\n NULL\n\n\n\n\n\n\n<=>\n\n\nexpr1 <=> expr2 - Returns same result as the EQUAL(=) operator for non-null operands,\nbut returns true if both are null, false if one of the them is null.\n\n\nArguments:\n\n\n\n\nexpr1, expr2 - the two expressions must be same type or can be casted to a common type,\n    and must be a type that can be used in equality comparison. Map type is not supported.\n    For complex types such array/struct, the data types of fields must be orderable.\n\n\n\n\nExamples:\n\n\n> SELECT 2 <=> 2;\n true\n> SELECT 1 <=> '1';\n true\n> SELECT true <=> NULL;\n false\n> SELECT NULL <=> NULL;\n true\n\n\n\n\n\n\n=\n\n\nexpr1 = expr2 - Returns true if \nexpr1\n equals \nexpr2\n, or false otherwise.\n\n\nArguments:\n\n\n\n\nexpr1, expr2 - the two expressions must be same type or can be casted to a common type,\n    and must be a type that can be used in equality comparison. Map type is not supported.\n    For complex types such array/struct, the data types of fields must be orderable.\n\n\n\n\nExamples:\n\n\n> SELECT 2 = 2;\n true\n> SELECT 1 = '1';\n true\n> SELECT true = NULL;\n NULL\n> SELECT NULL = NULL;\n NULL\n\n\n\n\n\n\n==\n\n\nexpr1 == expr2 - Returns true if \nexpr1\n equals \nexpr2\n, or false otherwise.\n\n\nArguments:\n\n\n\n\nexpr1, expr2 - the two expressions must be same type or can be casted to a common type,\n    and must be a type that can be used in equality comparison. Map type is not supported.\n    For complex types such array/struct, the data types of fields must be orderable.\n\n\n\n\nExamples:\n\n\n> SELECT 2 == 2;\n true\n> SELECT 1 == '1';\n true\n> SELECT true == NULL;\n NULL\n> SELECT NULL == NULL;\n NULL\n\n\n\n\n\n\n>\n\n\nexpr1 > expr2 - Returns true if \nexpr1\n is greater than \nexpr2\n.\n\n\nArguments:\n\n\n\n\nexpr1, expr2 - the two expressions must be same type or can be casted to a common type,\n    and must be a type that can be ordered. For example, map type is not orderable, so it\n    is not supported. For complex types such array/struct, the data types of fields must\n    be orderable.\n\n\n\n\nExamples:\n\n\n> SELECT 2 > 1;\n true\n> SELECT 2 > '1.1';\n true\n> SELECT to_date('2009-07-30 04:17:52') > to_date('2009-07-30 04:17:52');\n false\n> SELECT to_date('2009-07-30 04:17:52') > to_date('2009-08-01 04:17:52');\n false\n> SELECT 1 > NULL;\n NULL\n\n\n\n\n\n\n>=\n\n\nexpr1 >= expr2 - Returns true if \nexpr1\n is greater than or equal to \nexpr2\n.\n\n\nArguments:\n\n\n\n\nexpr1, expr2 - the two expressions must be same type or can be casted to a common type,\n    and must be a type that can be ordered. For example, map type is not orderable, so it\n    is not supported. For complex types such array/struct, the data types of fields must\n    be orderable.\n\n\n\n\nExamples:\n\n\n> SELECT 2 >= 1;\n true\n> SELECT 2.0 >= '2.1';\n false\n> SELECT to_date('2009-07-30 04:17:52') >= to_date('2009-07-30 04:17:52');\n true\n> SELECT to_date('2009-07-30 04:17:52') >= to_date('2009-08-01 04:17:52');\n false\n> SELECT 1 >= NULL;\n NULL\n\n\n\n\n\n\n^\n\n\nexpr1 ^ expr2 - Returns the result of bitwise exclusive OR of \nexpr1\n and \nexpr2\n.\n\n\nExamples:\n\n\n> SELECT 3 ^ 5;\n 6\n\n\n\n\n\n\nabs\n\n\nabs(expr) - Returns the absolute value of the numeric value.\n\n\nExamples:\n\n\n> SELECT abs(-1);\n 1\n\n\n\n\n\n\nacos\n\n\nacos(expr) - Returns the inverse cosine (a.k.a. arc cosine) of \nexpr\n, as if computed by\n\njava.lang.Math.acos\n.\n\n\nExamples:\n\n\n> SELECT acos(1);\n 0.0\n> SELECT acos(2);\n NaN\n\n\n\n\n\n\nadd_months\n\n\nadd_months(start_date, num_months) - Returns the date that is \nnum_months\n after \nstart_date\n.\n\n\nExamples:\n\n\n> SELECT add_months('2016-08-31', 1);\n 2016-09-30\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nand\n\n\nexpr1 and expr2 - Logical AND.\n\n\n\n\napprox_count_distinct\n\n\napprox_count_distinct(expr[, relativeSD]) - Returns the estimated cardinality by HyperLogLog++.\n\nrelativeSD\n defines the maximum estimation error allowed.\n\n\n\n\napprox_percentile\n\n\napprox_percentile(col, percentage [, accuracy]) - Returns the approximate percentile value of numeric\ncolumn \ncol\n at the given percentage. The value of percentage must be between 0.0\nand 1.0. The \naccuracy\n parameter (default: 10000) is a positive numeric literal which\ncontrols approximation accuracy at the cost of memory. Higher value of \naccuracy\n yields\nbetter accuracy, \n1.0/accuracy\n is the relative error of the approximation.\nWhen \npercentage\n is an array, each value of the percentage array must be between 0.0 and 1.0.\nIn this case, returns the approximate percentile array of column \ncol\n at the given\npercentage array.\n\n\nExamples:\n\n\n> SELECT approx_percentile(10.0, array(0.5, 0.4, 0.1), 100);\n [10.0,10.0,10.0]\n> SELECT approx_percentile(10.0, 0.5, 100);\n 10.0\n\n\n\n\n\n\narray\n\n\narray(expr, ...) - Returns an array with the given elements.\n\n\nExamples:\n\n\n> SELECT array(1, 2, 3);\n [1,2,3]\n\n\n\n\n\n\narray_contains\n\n\narray_contains(array, value) - Returns true if the array contains the value.\n\n\nExamples:\n\n\n> SELECT array_contains(array(1, 2, 3), 2);\n true\n\n\n\n\n\n\nascii\n\n\nascii(str) - Returns the numeric value of the first character of \nstr\n.\n\n\nExamples:\n\n\n> SELECT ascii('222');\n 50\n> SELECT ascii(2);\n 50\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nasin\n\n\nasin(expr) - Returns the inverse sine (a.k.a. arc sine) the arc sin of \nexpr\n,\nas if computed by \njava.lang.Math.asin\n.\n\n\nExamples:\n\n\n> SELECT asin(0);\n 0.0\n> SELECT asin(2);\n NaN\n\n\n\n\n\n\nassert_true\n\n\nassert_true(expr) - Throws an exception if \nexpr\n is not true.\n\n\nExamples:\n\n\n> SELECT assert_true(0 < 1);\n NULL\n\n\n\n\n\n\natan\n\n\natan(expr) - Returns the inverse tangent (a.k.a. arc tangent) of \nexpr\n, as if computed by\n\njava.lang.Math.atan\n\n\nExamples:\n\n\n> SELECT atan(0);\n 0.0\n\n\n\n\n\n\natan2\n\n\natan2(exprY, exprX) - Returns the angle in radians between the positive x-axis of a plane\nand the point given by the coordinates (\nexprX\n, \nexprY\n), as if computed by\n\njava.lang.Math.atan2\n.\n\n\nArguments:\n\n\n\n\nexprY - coordinate on y-axis\n\n\nexprX - coordinate on x-axis\n\n\n\n\nExamples:\n\n\n> SELECT atan2(0, 0);\n 0.0\n\n\n\n\n\n\navg\n\n\navg(expr) - Returns the mean calculated from values of a group.\n\n\n\n\nbase64\n\n\nbase64(bin) - Converts the argument from a binary \nbin\n to a base 64 string.\n\n\nExamples:\n\n\n> SELECT base64('Spark SQL');\n U3BhcmsgU1FM\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nbigint\n\n\nbigint(expr) - Casts the value \nexpr\n to the target data type \nbigint\n.\n\n\n\n\nbin\n\n\nbin(expr) - Returns the string representation of the long value \nexpr\n represented in binary.\n\n\nExamples:\n\n\n> SELECT bin(13);\n 1101\n> SELECT bin(-13);\n 1111111111111111111111111111111111111111111111111111111111110011\n> SELECT bin(13.3);\n 1101\n\n\n\n\n\n\nbinary\n\n\nbinary(expr) - Casts the value \nexpr\n to the target data type \nbinary\n.\n\n\n\n\nbit_length\n\n\nbit_length(expr) - Returns the bit length of string data or number of bits of binary data.\n\n\nExamples:\n\n\n> SELECT bit_length('Spark SQL');\n 72\n\n\n\n\nSince:\n 2.3.0\n\n\n\n\nboolean\n\n\nboolean(expr) - Casts the value \nexpr\n to the target data type \nboolean\n.\n\n\n\n\nbround\n\n\nbround(expr, d) - Returns \nexpr\n rounded to \nd\n decimal places using HALF_EVEN rounding mode.\n\n\nExamples:\n\n\n> SELECT bround(2.5, 0);\n 2.0\n\n\n\n\n\n\ncast\n\n\ncast(expr AS type) - Casts the value \nexpr\n to the target data type \ntype\n.\n\n\nExamples:\n\n\n> SELECT cast('10' as int);\n 10\n\n\n\n\n\n\ncbrt\n\n\ncbrt(expr) - Returns the cube root of \nexpr\n.\n\n\nExamples:\n\n\n> SELECT cbrt(27.0);\n 3.0\n\n\n\n\n\n\nceil\n\n\nceil(expr) - Returns the smallest integer not smaller than \nexpr\n.\n\n\nExamples:\n\n\n> SELECT ceil(-0.1);\n 0\n> SELECT ceil(5);\n 5\n\n\n\n\n\n\nceiling\n\n\nceiling(expr) - Returns the smallest integer not smaller than \nexpr\n.\n\n\nExamples:\n\n\n> SELECT ceiling(-0.1);\n 0\n> SELECT ceiling(5);\n 5\n\n\n\n\n\n\nchar\n\n\nchar(expr) - Returns the ASCII character having the binary equivalent to \nexpr\n. If n is larger than 256 the result is equivalent to chr(n % 256)\n\n\nExamples:\n\n\n> SELECT char(65);\n A\n\n\n\n\nSince:\n 2.3.0\n\n\n\n\nchar_length\n\n\nchar_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.\n\n\nExamples:\n\n\n> SELECT char_length('Spark SQL ');\n 10\n> SELECT CHAR_LENGTH('Spark SQL ');\n 10\n> SELECT CHARACTER_LENGTH('Spark SQL ');\n 10\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\ncharacter_length\n\n\ncharacter_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.\n\n\nExamples:\n\n\n> SELECT character_length('Spark SQL ');\n 10\n> SELECT CHAR_LENGTH('Spark SQL ');\n 10\n> SELECT CHARACTER_LENGTH('Spark SQL ');\n 10\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nchr\n\n\nchr(expr) - Returns the ASCII character having the binary equivalent to \nexpr\n. If n is larger than 256 the result is equivalent to chr(n % 256)\n\n\nExamples:\n\n\n> SELECT chr(65);\n A\n\n\n\n\nSince:\n 2.3.0\n\n\n\n\ncoalesce\n\n\ncoalesce(expr1, expr2, ...) - Returns the first non-null argument if exists. Otherwise, null.\n\n\nExamples:\n\n\n> SELECT coalesce(NULL, 1, NULL);\n 1\n\n\n\n\nSince:\n 1.0.0\n\n\n\n\ncollect_list\n\n\ncollect_list(expr) - Collects and returns a list of non-unique elements.\n\n\n\n\ncollect_set\n\n\ncollect_set(expr) - Collects and returns a set of unique elements.\n\n\n\n\nconcat\n\n\nconcat(str1, str2, ..., strN) - Returns the concatenation of str1, str2, ..., strN.\n\n\nExamples:\n\n\n> SELECT concat('Spark', 'SQL');\n SparkSQL\n\n\n\n\n\n\nconcat_ws\n\n\nconcat_ws(sep, [str | array(str)]+) - Returns the concatenation of the strings separated by \nsep\n.\n\n\nExamples:\n\n\n> SELECT concat_ws(' ', 'Spark', 'SQL');\n  Spark SQL\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nconv\n\n\nconv(num, from_base, to_base) - Convert \nnum\n from \nfrom_base\n to \nto_base\n.\n\n\nExamples:\n\n\n> SELECT conv('100', 2, 10);\n 4\n> SELECT conv(-10, 16, -10);\n -16\n\n\n\n\n\n\ncorr\n\n\ncorr(expr1, expr2) - Returns Pearson coefficient of correlation between a set of number pairs.\n\n\n\n\ncos\n\n\ncos(expr) - Returns the cosine of \nexpr\n, as if computed by\n\njava.lang.Math.cos\n.\n\n\nArguments:\n\n\n\n\nexpr - angle in radians\n\n\n\n\nExamples:\n\n\n> SELECT cos(0);\n 1.0\n\n\n\n\n\n\ncosh\n\n\ncosh(expr) - Returns the hyperbolic cosine of \nexpr\n, as if computed by\n\njava.lang.Math.cosh\n.\n\n\nArguments:\n\n\n\n\nexpr - hyperbolic angle\n\n\n\n\nExamples:\n\n\n> SELECT cosh(0);\n 1.0\n\n\n\n\n\n\ncot\n\n\ncot(expr) - Returns the cotangent of \nexpr\n, as if computed by \n1/java.lang.Math.cot\n.\n\n\nArguments:\n\n\n\n\nexpr - angle in radians\n\n\n\n\nExamples:\n\n\n> SELECT cot(1);\n 0.6420926159343306\n\n\n\n\n\n\ncount\n\n\ncount(*) - Returns the total number of retrieved rows, including rows containing null.\n\n\ncount(expr) - Returns the number of rows for which the supplied expression is non-null.\n\n\ncount(DISTINCT expr[, expr...]) - Returns the number of rows for which the supplied expression(s) are unique and non-null.\n\n\n\n\ncount_min_sketch\n\n\ncount_min_sketch(col, eps, confidence, seed) - Returns a count-min sketch of a column with the given esp,\nconfidence and seed. The result is an array of bytes, which can be deserialized to a\n\nCountMinSketch\n before usage. Count-min sketch is a probabilistic data structure used for\ncardinality estimation using sub-linear space.\n\n\n\n\ncovar_pop\n\n\ncovar_pop(expr1, expr2) - Returns the population covariance of a set of number pairs.\n\n\n\n\ncovar_samp\n\n\ncovar_samp(expr1, expr2) - Returns the sample covariance of a set of number pairs.\n\n\n\n\ncrc32\n\n\ncrc32(expr) - Returns a cyclic redundancy check value of the \nexpr\n as a bigint.\n\n\nExamples:\n\n\n> SELECT crc32('Spark');\n 1557323817\n\n\n\n\n\n\ncube\n\n\ncube([col1[, col2 ..]]) - create a multi-dimensional cube using the specified columns\nso that we can run aggregation on them.\n\n\nExamples:\n\n\n> SELECT name, age, count(*) FROM VALUES (2, 'Alice'), (5, 'Bob') people(age, name) GROUP BY cube(name, age);\n  NULL    2       1\n  NULL    NULL    2\n  Alice   2       1\n  Bob     5       1\n  NULL    5       1\n  Bob     NULL    1\n  Alice   NULL    1\n\n\n\n\nSince:\n 2.0.0\n\n\n\n\ncume_dist\n\n\ncume_dist() - Computes the position of a value relative to all values in the partition.\n\n\n\n\ncurrent_database\n\n\ncurrent_database() - Returns the current database.\n\n\nExamples:\n\n\n> SELECT current_database();\n default\n\n\n\n\n\n\ncurrent_date\n\n\ncurrent_date() - Returns the current date at the start of query evaluation.\n\n\nSince:\n 1.5.0\n\n\n\n\ncurrent_timestamp\n\n\ncurrent_timestamp() - Returns the current timestamp at the start of query evaluation.\n\n\nSince:\n 1.5.0\n\n\n\n\ndate\n\n\ndate(expr) - Casts the value \nexpr\n to the target data type \ndate\n.\n\n\n\n\ndate_add\n\n\ndate_add(start_date, num_days) - Returns the date that is \nnum_days\n after \nstart_date\n.\n\n\nExamples:\n\n\n> SELECT date_add('2016-07-30', 1);\n 2016-07-31\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\ndate_format\n\n\ndate_format(timestamp, fmt) - Converts \ntimestamp\n to a value of string in the format specified by the date format \nfmt\n.\n\n\nExamples:\n\n\n> SELECT date_format('2016-04-08', 'y');\n 2016\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\ndate_sub\n\n\ndate_sub(start_date, num_days) - Returns the date that is \nnum_days\n before \nstart_date\n.\n\n\nExamples:\n\n\n> SELECT date_sub('2016-07-30', 1);\n 2016-07-29\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\ndate_trunc\n\n\ndate_trunc(fmt, ts) - Returns timestamp \nts\n truncated to the unit specified by the format model \nfmt\n.\n\nfmt\n should be one of [\"YEAR\", \"YYYY\", \"YY\", \"MON\", \"MONTH\", \"MM\", \"DAY\", \"DD\", \"HOUR\", \"MINUTE\", \"SECOND\", \"WEEK\", \"QUARTER\"]\n\n\nExamples:\n\n\n> SELECT date_trunc('YEAR', '2015-03-05T09:32:05.359');\n 2015-01-01 00:00:00\n> SELECT date_trunc('MM', '2015-03-05T09:32:05.359');\n 2015-03-01 00:00:00\n> SELECT date_trunc('DD', '2015-03-05T09:32:05.359');\n 2015-03-05 00:00:00\n> SELECT date_trunc('HOUR', '2015-03-05T09:32:05.359');\n 2015-03-05 09:00:00\n\n\n\n\nSince:\n 2.3.0\n\n\n\n\ndatediff\n\n\ndatediff(endDate, startDate) - Returns the number of days from \nstartDate\n to \nendDate\n.\n\n\nExamples:\n\n\n> SELECT datediff('2009-07-31', '2009-07-30');\n 1\n\n> SELECT datediff('2009-07-30', '2009-07-31');\n -1\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nday\n\n\nday(date) - Returns the day of month of the date/timestamp.\n\n\nExamples:\n\n\n> SELECT day('2009-07-30');\n 30\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\ndayofmonth\n\n\ndayofmonth(date) - Returns the day of month of the date/timestamp.\n\n\nExamples:\n\n\n> SELECT dayofmonth('2009-07-30');\n 30\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\ndayofweek\n\n\ndayofweek(date) - Returns the day of the week for date/timestamp (1 = Sunday, 2 = Monday, ..., 7 = Saturday).\n\n\nExamples:\n\n\n> SELECT dayofweek('2009-07-30');\n 5\n\n\n\n\nSince:\n 2.3.0\n\n\n\n\ndayofyear\n\n\ndayofyear(date) - Returns the day of year of the date/timestamp.\n\n\nExamples:\n\n\n> SELECT dayofyear('2016-04-09');\n 100\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\ndecimal\n\n\ndecimal(expr) - Casts the value \nexpr\n to the target data type \ndecimal\n.\n\n\n\n\ndecode\n\n\ndecode(bin, charset) - Decodes the first argument using the second argument character set.\n\n\nExamples:\n\n\n> SELECT decode(encode('abc', 'utf-8'), 'utf-8');\n abc\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\ndegrees\n\n\ndegrees(expr) - Converts radians to degrees.\n\n\nArguments:\n\n\n\n\nexpr - angle in radians\n\n\n\n\nExamples:\n\n\n> SELECT degrees(3.141592653589793);\n 180.0\n\n\n\n\n\n\ndense_rank\n\n\ndense_rank() - Computes the rank of a value in a group of values. The result is one plus the\npreviously assigned rank value. Unlike the function rank, dense_rank will not produce gaps\nin the ranking sequence.\n\n\n\n\ndouble\n\n\ndouble(expr) - Casts the value \nexpr\n to the target data type \ndouble\n.\n\n\n\n\ne\n\n\ne() - Returns Euler's number, e.\n\n\nExamples:\n\n\n> SELECT e();\n 2.718281828459045\n\n\n\n\n\n\nelt\n\n\nelt(n, input1, input2, ...) - Returns the \nn\n-th input, e.g., returns \ninput2\n when \nn\n is 2.\n\n\nExamples:\n\n\n> SELECT elt(1, 'scala', 'java');\n scala\n\n\n\n\nSince:\n 2.0.0\n\n\n\n\nencode\n\n\nencode(str, charset) - Encodes the first argument using the second argument character set.\n\n\nExamples:\n\n\n> SELECT encode('abc', 'utf-8');\n abc\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nexp\n\n\nexp(expr) - Returns e to the power of \nexpr\n.\n\n\nExamples:\n\n\n> SELECT exp(0);\n 1.0\n\n\n\n\n\n\nexplode\n\n\nexplode(expr) - Separates the elements of array \nexpr\n into multiple rows, or the elements of map \nexpr\n into multiple rows and columns.\n\n\nExamples:\n\n\n> SELECT explode(array(10, 20));\n 10\n 20\n\n\n\n\n\n\nexplode_outer\n\n\nexplode_outer(expr) - Separates the elements of array \nexpr\n into multiple rows, or the elements of map \nexpr\n into multiple rows and columns.\n\n\nExamples:\n\n\n> SELECT explode_outer(array(10, 20));\n 10\n 20\n\n\n\n\n\n\nexpm1\n\n\nexpm1(expr) - Returns exp(\nexpr\n) - 1.\n\n\nExamples:\n\n\n> SELECT expm1(0);\n 0.0\n\n\n\n\n\n\nfactorial\n\n\nfactorial(expr) - Returns the factorial of \nexpr\n. \nexpr\n is [0..20]. Otherwise, null.\n\n\nExamples:\n\n\n> SELECT factorial(5);\n 120\n\n\n\n\n\n\nfind_in_set\n\n\nfind_in_set(str, str_array) - Returns the index (1-based) of the given string (\nstr\n) in the comma-delimited list (\nstr_array\n).\nReturns 0, if the string was not found or if the given string (\nstr\n) contains a comma.\n\n\nExamples:\n\n\n> SELECT find_in_set('ab','abc,b,ab,c,def');\n 3\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nfirst\n\n\nfirst(expr[, isIgnoreNull]) - Returns the first value of \nexpr\n for a group of rows.\nIf \nisIgnoreNull\n is true, returns only non-null values.\n\n\n\n\nfirst_value\n\n\nfirst_value(expr[, isIgnoreNull]) - Returns the first value of \nexpr\n for a group of rows.\nIf \nisIgnoreNull\n is true, returns only non-null values.\n\n\n\n\nfloat\n\n\nfloat(expr) - Casts the value \nexpr\n to the target data type \nfloat\n.\n\n\n\n\nfloor\n\n\nfloor(expr) - Returns the largest integer not greater than \nexpr\n.\n\n\nExamples:\n\n\n> SELECT floor(-0.1);\n -1\n> SELECT floor(5);\n 5\n\n\n\n\n\n\nformat_number\n\n\nformat_number(expr1, expr2) - Formats the number \nexpr1\n like '#,###,###.##', rounded to \nexpr2\n\ndecimal places. If \nexpr2\n is 0, the result has no decimal point or fractional part.\nThis is supposed to function like MySQL's FORMAT.\n\n\nExamples:\n\n\n> SELECT format_number(12332.123456, 4);\n 12,332.1235\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nformat_string\n\n\nformat_string(strfmt, obj, ...) - Returns a formatted string from printf-style format strings.\n\n\nExamples:\n\n\n> SELECT format_string(\"Hello World %d %s\", 100, \"days\");\n Hello World 100 days\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nfrom_json\n\n\nfrom_json(jsonStr, schema[, options]) - Returns a struct value with the given \njsonStr\n and \nschema\n.\n\n\nExamples:\n\n\n> SELECT from_json('{\"a\":1, \"b\":0.8}', 'a INT, b DOUBLE');\n {\"a\":1, \"b\":0.8}\n> SELECT from_json('{\"time\":\"26/08/2015\"}', 'time Timestamp', map('timestampFormat', 'dd/MM/yyyy'));\n {\"time\":\"2015-08-26 00:00:00.0\"}\n\n\n\n\nSince:\n 2.2.0\n\n\n\n\nfrom_unixtime\n\n\nfrom_unixtime(unix_time, format) - Returns \nunix_time\n in the specified \nformat\n.\n\n\nExamples:\n\n\n> SELECT from_unixtime(0, 'yyyy-MM-dd HH:mm:ss');\n 1970-01-01 00:00:00\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nfrom_utc_timestamp\n\n\nfrom_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'.\n\n\nExamples:\n\n\n> SELECT from_utc_timestamp('2016-08-31', 'Asia/Seoul');\n 2016-08-31 09:00:00\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nget_json_object\n\n\nget_json_object(json_txt, path) - Extracts a json object from \npath\n.\n\n\nExamples:\n\n\n> SELECT get_json_object('{\"a\":\"b\"}', '$.a');\n b\n\n\n\n\n\n\ngreatest\n\n\ngreatest(expr, ...) - Returns the greatest value of all parameters, skipping null values.\n\n\nExamples:\n\n\n> SELECT greatest(10, 9, 2, 4, 3);\n 10\n\n\n\n\n\n\ngrouping\n\n\ngrouping(col) - indicates whether a specified column in a GROUP BY is aggregated or\nnot, returns 1 for aggregated or 0 for not aggregated in the result set.\",\n\n\nExamples:\n\n\n> SELECT name, grouping(name), sum(age) FROM VALUES (2, 'Alice'), (5, 'Bob') people(age, name) GROUP BY cube(name);\n  Alice   0       2\n  NULL    1       7\n  Bob     0       5\n\n\n\n\nSince:\n 2.0.0\n\n\n\n\ngrouping_id\n\n\ngrouping_id([col1[, col2 ..]]) - returns the level of grouping, equals to\n\n(grouping(c1) << (n-1)) + (grouping(c2) << (n-2)) + ... + grouping(cn)\n\n\nExamples:\n\n\n> 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);\n  NULL    2       2       165.0\n  Alice   0       2       165.0\n  NULL    2       5       180.0\n  NULL    3       7       172.5\n  Bob     0       5       180.0\n  Bob     1       5       180.0\n  Alice   1       2       165.0\n\n\n\n\nNote:\n\n\nInput columns should match with grouping columns exactly, or empty (means all the grouping\ncolumns).\n\n\nSince:\n 2.0.0\n\n\n\n\nhash\n\n\nhash(expr1, expr2, ...) - Returns a hash value of the arguments.\n\n\nExamples:\n\n\n> SELECT hash('Spark', array(123), 2);\n -1321691492\n\n\n\n\n\n\nhex\n\n\nhex(expr) - Converts \nexpr\n to hexadecimal.\n\n\nExamples:\n\n\n> SELECT hex(17);\n 11\n> SELECT hex('Spark SQL');\n 537061726B2053514C\n\n\n\n\n\n\nhour\n\n\nhour(timestamp) - Returns the hour component of the string/timestamp.\n\n\nExamples:\n\n\n> SELECT hour('2009-07-30 12:58:59');\n 12\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nhypot\n\n\nhypot(expr1, expr2) - Returns sqrt(\nexpr1\n2 + \nexpr2\n2).\n\n\nExamples:\n\n\n> SELECT hypot(3, 4);\n 5.0\n\n\n\n\n\n\nif\n\n\nif(expr1, expr2, expr3) - If \nexpr1\n evaluates to true, then returns \nexpr2\n; otherwise returns \nexpr3\n.\n\n\nExamples:\n\n\n> SELECT if(1 < 2, 'a', 'b');\n a\n\n\n\n\n\n\nifnull\n\n\nifnull(expr1, expr2) - Returns \nexpr2\n if \nexpr1\n is null, or \nexpr1\n otherwise.\n\n\nExamples:\n\n\n> SELECT ifnull(NULL, array('2'));\n [\"2\"]\n\n\n\n\nSince:\n 2.0.0\n\n\n\n\nin\n\n\nexpr1 in(expr2, expr3, ...) - Returns true if \nexpr\n equals to any valN.\n\n\nArguments:\n\n\n\n\nexpr1, expr2, expr3, ... - the arguments must be same type.\n\n\n\n\nExamples:\n\n\n> SELECT 1 in(1, 2, 3);\n true\n> SELECT 1 in(2, 3, 4);\n false\n> SELECT named_struct('a', 1, 'b', 2) in(named_struct('a', 1, 'b', 1), named_struct('a', 1, 'b', 3));\n false\n> SELECT named_struct('a', 1, 'b', 2) in(named_struct('a', 1, 'b', 2), named_struct('a', 1, 'b', 3));\n true\n\n\n\n\n\n\ninitcap\n\n\ninitcap(str) - Returns \nstr\n with the first letter of each word in uppercase.\nAll other letters are in lowercase. Words are delimited by white space.\n\n\nExamples:\n\n\n> SELECT initcap('sPark sql');\n Spark Sql\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\ninline\n\n\ninline(expr) - Explodes an array of structs into a table.\n\n\nExamples:\n\n\n> SELECT inline(array(struct(1, 'a'), struct(2, 'b')));\n 1  a\n 2  b\n\n\n\n\n\n\ninline_outer\n\n\ninline_outer(expr) - Explodes an array of structs into a table.\n\n\nExamples:\n\n\n> SELECT inline_outer(array(struct(1, 'a'), struct(2, 'b')));\n 1  a\n 2  b\n\n\n\n\n\n\ninput_file_block_length\n\n\ninput_file_block_length() - Returns the length of the block being read, or -1 if not available.\n\n\n\n\ninput_file_block_start\n\n\ninput_file_block_start() - Returns the start offset of the block being read, or -1 if not available.\n\n\n\n\ninput_file_name\n\n\ninput_file_name() - Returns the name of the file being read, or empty string if not available.\n\n\n\n\ninstr\n\n\ninstr(str, substr) - Returns the (1-based) index of the first occurrence of \nsubstr\n in \nstr\n.\n\n\nExamples:\n\n\n> SELECT instr('SparkSQL', 'SQL');\n 6\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nint\n\n\nint(expr) - Casts the value \nexpr\n to the target data type \nint\n.\n\n\n\n\nisnan\n\n\nisnan(expr) - Returns true if \nexpr\n is NaN, or false otherwise.\n\n\nExamples:\n\n\n> SELECT isnan(cast('NaN' as double));\n true\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nisnotnull\n\n\nisnotnull(expr) - Returns true if \nexpr\n is not null, or false otherwise.\n\n\nExamples:\n\n\n> SELECT isnotnull(1);\n true\n\n\n\n\nSince:\n 1.0.0\n\n\n\n\nisnull\n\n\nisnull(expr) - Returns true if \nexpr\n is null, or false otherwise.\n\n\nExamples:\n\n\n> SELECT isnull(1);\n false\n\n\n\n\nSince:\n 1.0.0\n\n\n\n\njava_method\n\n\njava_method(class, method[, arg1[, arg2 ..]]) - Calls a method with reflection.\n\n\nExamples:\n\n\n> SELECT java_method('java.util.UUID', 'randomUUID');\n c33fb387-8500-4bfa-81d2-6e0e3e930df2\n> SELECT java_method('java.util.UUID', 'fromString', 'a5cf6c42-0c85-418f-af6c-3e4e5b1328f2');\n a5cf6c42-0c85-418f-af6c-3e4e5b1328f2\n\n\n\n\n\n\njson_tuple\n\n\njson_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.\n\n\nExamples:\n\n\n> SELECT json_tuple('{\"a\":1, \"b\":2}', 'a', 'b');\n 1  2\n\n\n\n\n\n\nkurtosis\n\n\nkurtosis(expr) - Returns the kurtosis value calculated from values of a group.\n\n\n\n\nlag\n\n\nlag(input[, offset[, default]]) - Returns the value of \ninput\n at the \noffset\nth row\nbefore the current row in the window. The default value of \noffset\n is 1 and the default\nvalue of \ndefault\n is null. If the value of \ninput\n at the \noffset\nth row is null,\nnull is returned. If there is no such offset row (e.g., when the offset is 1, the first\nrow of the window does not have any previous row), \ndefault\n is returned.\n\n\n\n\nlast\n\n\nlast(expr[, isIgnoreNull]) - Returns the last value of \nexpr\n for a group of rows.\nIf \nisIgnoreNull\n is true, returns only non-null values.\n\n\n\n\nlast_day\n\n\nlast_day(date) - Returns the last day of the month which the date belongs to.\n\n\nExamples:\n\n\n> SELECT last_day('2009-01-12');\n 2009-01-31\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nlast_value\n\n\nlast_value(expr[, isIgnoreNull]) - Returns the last value of \nexpr\n for a group of rows.\nIf \nisIgnoreNull\n is true, returns only non-null values.\n\n\n\n\nlcase\n\n\nlcase(str) - Returns \nstr\n with all characters changed to lowercase.\n\n\nExamples:\n\n\n> SELECT lcase('SparkSql');\n sparksql\n\n\n\n\nSince:\n 1.0.1\n\n\n\n\nlead\n\n\nlead(input[, offset[, default]]) - Returns the value of \ninput\n at the \noffset\nth row\nafter the current row in the window. The default value of \noffset\n is 1 and the default\nvalue of \ndefault\n is null. If the value of \ninput\n at the \noffset\nth row is null,\nnull is returned. If there is no such an offset row (e.g., when the offset is 1, the last\nrow of the window does not have any subsequent row), \ndefault\n is returned.\n\n\n\n\nleast\n\n\nleast(expr, ...) - Returns the least value of all parameters, skipping null values.\n\n\nExamples:\n\n\n> SELECT least(10, 9, 2, 4, 3);\n 2\n\n\n\n\n\n\nleft\n\n\nleft(str, len) - Returns the leftmost \nlen\n(\nlen\n can be string type) characters from the string \nstr\n,if \nlen\n is less or equal than 0 the result is an empty string.\n\n\nExamples:\n\n\n> SELECT left('Spark SQL', 3);\n Spa\n\n\n\n\nSince:\n 2.3.0\n\n\n\n\nlength\n\n\nlength(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.\n\n\nExamples:\n\n\n> SELECT length('Spark SQL ');\n 10\n> SELECT CHAR_LENGTH('Spark SQL ');\n 10\n> SELECT CHARACTER_LENGTH('Spark SQL ');\n 10\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nlevenshtein\n\n\nlevenshtein(str1, str2) - Returns the Levenshtein distance between the two given strings.\n\n\nExamples:\n\n\n> SELECT levenshtein('kitten', 'sitting');\n 3\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nlike\n\n\nstr like pattern - Returns true if str matches pattern, null if any arguments are null, false otherwise.\n\n\nArguments:\n\n\n\n\nstr - a string expression\n\n\n\n\npattern - a string expression. The pattern is a string which is matched literally, with\n    exception to the following special symbols:\n\n\n_ matches any one character in the input (similar to . in posix regular expressions)\n\n\n% matches zero or more characters in the input (similar to .* in posix regular\nexpressions)\n\n\nThe escape character is '\\'. If an escape character precedes a special symbol or another\nescape character, the following character is matched literally. It is invalid to escape\nany other character.\n\n\nSince Spark 2.0, string literals are unescaped in our SQL parser. For example, in order\nto match \"\\abc\", the pattern should be \"\\abc\".\n\n\nWhen SQL config 'spark.sql.parser.escapedStringLiterals' is enabled, it fallbacks\nto Spark 1.6 behavior regarding string literal parsing. For example, if the config is\nenabled, the pattern to match \"\\abc\" should be \"\\abc\".\n\n\n\n\n\n\nExamples:\n\n\n> SELECT '%SystemDrive%\\Users\\John' like '\\%SystemDrive\\%\\\\Users%'\ntrue\n\n\n\n\nNote:\n\n\nUse RLIKE to match with standard regular expressions.\n\n\nSince:\n 1.0.0\n\n\n\n\nln\n\n\nln(expr) - Returns the natural logarithm (base e) of \nexpr\n.\n\n\nExamples:\n\n\n> SELECT ln(1);\n 0.0\n\n\n\n\n\n\nlocate\n\n\nlocate(substr, str[, pos]) - Returns the position of the first occurrence of \nsubstr\n in \nstr\n after position \npos\n.\nThe given \npos\n and return value are 1-based.\n\n\nExamples:\n\n\n> SELECT locate('bar', 'foobarbar');\n 4\n> SELECT locate('bar', 'foobarbar', 5);\n 7\n> SELECT POSITION('bar' IN 'foobarbar');\n 4\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nlog\n\n\nlog(base, expr) - Returns the logarithm of \nexpr\n with \nbase\n.\n\n\nExamples:\n\n\n> SELECT log(10, 100);\n 2.0\n\n\n\n\n\n\nlog10\n\n\nlog10(expr) - Returns the logarithm of \nexpr\n with base 10.\n\n\nExamples:\n\n\n> SELECT log10(10);\n 1.0\n\n\n\n\n\n\nlog1p\n\n\nlog1p(expr) - Returns log(1 + \nexpr\n).\n\n\nExamples:\n\n\n> SELECT log1p(0);\n 0.0\n\n\n\n\n\n\nlog2\n\n\nlog2(expr) - Returns the logarithm of \nexpr\n with base 2.\n\n\nExamples:\n\n\n> SELECT log2(2);\n 1.0\n\n\n\n\n\n\nlower\n\n\nlower(str) - Returns \nstr\n with all characters changed to lowercase.\n\n\nExamples:\n\n\n> SELECT lower('SparkSql');\n sparksql\n\n\n\n\nSince:\n 1.0.1\n\n\n\n\nlpad\n\n\nlpad(str, len, pad) - Returns \nstr\n, left-padded with \npad\n to a length of \nlen\n.\nIf \nstr\n is longer than \nlen\n, the return value is shortened to \nlen\n characters.\n\n\nExamples:\n\n\n> SELECT lpad('hi', 5, '??');\n ???hi\n> SELECT lpad('hi', 1, '??');\n h\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nltrim\n\n\nltrim(str) - Removes the leading space characters from \nstr\n.\n\n\nltrim(trimStr, str) - Removes the leading string contains the characters from the trim string\n\n\nArguments:\n\n\n\n\nstr - a string expression\n\n\ntrimStr - the trim string characters to trim, the default value is a single space\n\n\n\n\nExamples:\n\n\n> SELECT ltrim('    SparkSQL   ');\n SparkSQL\n> SELECT ltrim('Sp', 'SSparkSQLS');\n arkSQLS\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nmap\n\n\nmap(key0, value0, key1, value1, ...) - Creates a map with the given key/value pairs.\n\n\nExamples:\n\n\n> SELECT map(1.0, '2', 3.0, '4');\n {1.0:\"2\",3.0:\"4\"}\n\n\n\n\n\n\nmap_keys\n\n\nmap_keys(map) - Returns an unordered array containing the keys of the map.\n\n\nExamples:\n\n\n> SELECT map_keys(map(1, 'a', 2, 'b'));\n [1,2]\n\n\n\n\n\n\nmap_values\n\n\nmap_values(map) - Returns an unordered array containing the values of the map.\n\n\nExamples:\n\n\n> SELECT map_values(map(1, 'a', 2, 'b'));\n [\"a\",\"b\"]\n\n\n\n\n\n\nmax\n\n\nmax(expr) - Returns the maximum value of \nexpr\n.\n\n\n\n\nmd5\n\n\nmd5(expr) - Returns an MD5 128-bit checksum as a hex string of \nexpr\n.\n\n\nExamples:\n\n\n> SELECT md5('Spark');\n 8cde774d6f7333752ed72cacddb05126\n\n\n\n\n\n\nmean\n\n\nmean(expr) - Returns the mean calculated from values of a group.\n\n\n\n\nmin\n\n\nmin(expr) - Returns the minimum value of \nexpr\n.\n\n\n\n\nminute\n\n\nminute(timestamp) - Returns the minute component of the string/timestamp.\n\n\nExamples:\n\n\n> SELECT minute('2009-07-30 12:58:59');\n 58\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nmod\n\n\nexpr1 mod expr2 - Returns the remainder after \nexpr1\n/\nexpr2\n.\n\n\nExamples:\n\n\n> SELECT 2 mod 1.8;\n 0.2\n> SELECT MOD(2, 1.8);\n 0.2\n\n\n\n\n\n\nmonotonically_increasing_id\n\n\nmonotonically_increasing_id() - Returns monotonically increasing 64-bit integers. The generated ID is guaranteed\nto be monotonically increasing and unique, but not consecutive. The current implementation\nputs the partition ID in the upper 31 bits, and the lower 33 bits represent the record number\nwithin each partition. The assumption is that the data frame has less than 1 billion\npartitions, and each partition has less than 8 billion records.\n\n\n\n\nmonth\n\n\nmonth(date) - Returns the month component of the date/timestamp.\n\n\nExamples:\n\n\n> SELECT month('2016-07-30');\n 7\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nmonths_between\n\n\nmonths_between(timestamp1, timestamp2) - Returns number of months between \ntimestamp1\n and \ntimestamp2\n.\n\n\nExamples:\n\n\n> SELECT months_between('1997-02-28 10:30:00', '1996-10-30');\n 3.94959677\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nnamed_struct\n\n\nnamed_struct(name1, val1, name2, val2, ...) - Creates a struct with the given field names and values.\n\n\nExamples:\n\n\n> SELECT named_struct(\"a\", 1, \"b\", 2, \"c\", 3);\n {\"a\":1,\"b\":2,\"c\":3}\n\n\n\n\n\n\nnanvl\n\n\nnanvl(expr1, expr2) - Returns \nexpr1\n if it's not NaN, or \nexpr2\n otherwise.\n\n\nExamples:\n\n\n> SELECT nanvl(cast('NaN' as double), 123);\n 123.0\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nnegative\n\n\nnegative(expr) - Returns the negated value of \nexpr\n.\n\n\nExamples:\n\n\n> SELECT negative(1);\n -1\n\n\n\n\n\n\nnext_day\n\n\nnext_day(start_date, day_of_week) - Returns the first date which is later than \nstart_date\n and named as indicated.\n\n\nExamples:\n\n\n> SELECT next_day('2015-01-14', 'TU');\n 2015-01-20\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nnot\n\n\nnot expr - Logical not.\n\n\n\n\nnow\n\n\nnow() - Returns the current timestamp at the start of query evaluation.\n\n\nSince:\n 1.5.0\n\n\n\n\nntile\n\n\nntile(n) - Divides the rows for each window partition into \nn\n buckets ranging\nfrom 1 to at most \nn\n.\n\n\n\n\nnullif\n\n\nnullif(expr1, expr2) - Returns null if \nexpr1\n equals to \nexpr2\n, or \nexpr1\n otherwise.\n\n\nExamples:\n\n\n> SELECT nullif(2, 2);\n NULL\n\n\n\n\nSince:\n 2.0.0\n\n\n\n\nnvl\n\n\nnvl(expr1, expr2) - Returns \nexpr2\n if \nexpr1\n is null, or \nexpr1\n otherwise.\n\n\nExamples:\n\n\n> SELECT nvl(NULL, array('2'));\n [\"2\"]\n\n\n\n\nSince:\n 2.0.0\n\n\n\n\nnvl2\n\n\nnvl2(expr1, expr2, expr3) - Returns \nexpr2\n if \nexpr1\n is not null, or \nexpr3\n otherwise.\n\n\nExamples:\n\n\n> SELECT nvl2(NULL, 2, 1);\n 1\n\n\n\n\nSince:\n 2.0.0\n\n\n\n\noctet_length\n\n\noctet_length(expr) - Returns the byte length of string data or number of bytes of binary data.\n\n\nExamples:\n\n\n> SELECT octet_length('Spark SQL');\n 9\n\n\n\n\nSince:\n 2.3.0\n\n\n\n\nor\n\n\nexpr1 or expr2 - Logical OR.\n\n\n\n\nparse_url\n\n\nparse_url(url, partToExtract[, key]) - Extracts a part from a URL.\n\n\nExamples:\n\n\n> SELECT parse_url('http://spark.apache.org/path?query=1', 'HOST')\n spark.apache.org\n> SELECT parse_url('http://spark.apache.org/path?query=1', 'QUERY')\n query=1\n> SELECT parse_url('http://spark.apache.org/path?query=1', 'QUERY', 'query')\n 1\n\n\n\n\nSince:\n 2.0.0\n\n\n\n\npercent_rank\n\n\npercent_rank() - Computes the percentage ranking of a value in a group of values.\n\n\n\n\npercentile\n\n\npercentile(col, percentage [, frequency]) - Returns the exact percentile value of numeric column\n\ncol\n at the given percentage. The value of percentage must be between 0.0 and 1.0. The\nvalue of frequency should be positive integral\n\n\npercentile(col, array(percentage1 [, percentage2]...) [, frequency]) - Returns the exact\npercentile value array of numeric column \ncol\n at the given percentage(s). Each value\nof the percentage array must be between 0.0 and 1.0. The value of frequency should be\npositive integral\n\n\n\n\npercentile_approx\n\n\npercentile_approx(col, percentage [, accuracy]) - Returns the approximate percentile value of numeric\ncolumn \ncol\n at the given percentage. The value of percentage must be between 0.0\nand 1.0. The \naccuracy\n parameter (default: 10000) is a positive numeric literal which\ncontrols approximation accuracy at the cost of memory. Higher value of \naccuracy\n yields\nbetter accuracy, \n1.0/accuracy\n is the relative error of the approximation.\nWhen \npercentage\n is an array, each value of the percentage array must be between 0.0 and 1.0.\nIn this case, returns the approximate percentile array of column \ncol\n at the given\npercentage array.\n\n\nExamples:\n\n\n> SELECT percentile_approx(10.0, array(0.5, 0.4, 0.1), 100);\n [10.0,10.0,10.0]\n> SELECT percentile_approx(10.0, 0.5, 100);\n 10.0\n\n\n\n\n\n\npi\n\n\npi() - Returns pi.\n\n\nExamples:\n\n\n> SELECT pi();\n 3.141592653589793\n\n\n\n\n\n\npmod\n\n\npmod(expr1, expr2) - Returns the positive value of \nexpr1\n mod \nexpr2\n.\n\n\nExamples:\n\n\n> SELECT pmod(10, 3);\n 1\n> SELECT pmod(-10, 3);\n 2\n\n\n\n\n\n\nposexplode\n\n\nposexplode(expr) - Separates the elements of array \nexpr\n into multiple rows with positions, or the elements of map \nexpr\n into multiple rows and columns with positions.\n\n\nExamples:\n\n\n> SELECT posexplode(array(10,20));\n 0  10\n 1  20\n\n\n\n\n\n\nposexplode_outer\n\n\nposexplode_outer(expr) - Separates the elements of array \nexpr\n into multiple rows with positions, or the elements of map \nexpr\n into multiple rows and columns with positions.\n\n\nExamples:\n\n\n> SELECT posexplode_outer(array(10,20));\n 0  10\n 1  20\n\n\n\n\n\n\nposition\n\n\nposition(substr, str[, pos]) - Returns the position of the first occurrence of \nsubstr\n in \nstr\n after position \npos\n.\nThe given \npos\n and return value are 1-based.\n\n\nExamples:\n\n\n> SELECT position('bar', 'foobarbar');\n 4\n> SELECT position('bar', 'foobarbar', 5);\n 7\n> SELECT POSITION('bar' IN 'foobarbar');\n 4\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\npositive\n\n\npositive(expr) - Returns the value of \nexpr\n.\n\n\n\n\npow\n\n\npow(expr1, expr2) - Raises \nexpr1\n to the power of \nexpr2\n.\n\n\nExamples:\n\n\n> SELECT pow(2, 3);\n 8.0\n\n\n\n\n\n\npower\n\n\npower(expr1, expr2) - Raises \nexpr1\n to the power of \nexpr2\n.\n\n\nExamples:\n\n\n> SELECT power(2, 3);\n 8.0\n\n\n\n\n\n\nprintf\n\n\nprintf(strfmt, obj, ...) - Returns a formatted string from printf-style format strings.\n\n\nExamples:\n\n\n> SELECT printf(\"Hello World %d %s\", 100, \"days\");\n Hello World 100 days\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nquarter\n\n\nquarter(date) - Returns the quarter of the year for date, in the range 1 to 4.\n\n\nExamples:\n\n\n> SELECT quarter('2016-08-31');\n 3\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nradians\n\n\nradians(expr) - Converts degrees to radians.\n\n\nArguments:\n\n\n\n\nexpr - angle in degrees\n\n\n\n\nExamples:\n\n\n> SELECT radians(180);\n 3.141592653589793\n\n\n\n\n\n\nrand\n\n\nrand([seed]) - Returns a random value with independent and identically distributed (i.i.d.) uniformly distributed values in [0, 1).\n\n\nExamples:\n\n\n> SELECT rand();\n 0.9629742951434543\n> SELECT rand(0);\n 0.8446490682263027\n> SELECT rand(null);\n 0.8446490682263027\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nrandn\n\n\nrandn([seed]) - Returns a random value with independent and identically distributed (i.i.d.) values drawn from the standard normal distribution.\n\n\nExamples:\n\n\n> SELECT randn();\n -0.3254147983080288\n> SELECT randn(0);\n 1.1164209726833079\n> SELECT randn(null);\n 1.1164209726833079\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nrank\n\n\nrank() - Computes the rank of a value in a group of values. The result is one plus the number\nof rows preceding or equal to the current row in the ordering of the partition. The values\nwill produce gaps in the sequence.\n\n\n\n\nreflect\n\n\nreflect(class, method[, arg1[, arg2 ..]]) - Calls a method with reflection.\n\n\nExamples:\n\n\n> SELECT reflect('java.util.UUID', 'randomUUID');\n c33fb387-8500-4bfa-81d2-6e0e3e930df2\n> SELECT reflect('java.util.UUID', 'fromString', 'a5cf6c42-0c85-418f-af6c-3e4e5b1328f2');\n a5cf6c42-0c85-418f-af6c-3e4e5b1328f2\n\n\n\n\n\n\nregexp_extract\n\n\nregexp_extract(str, regexp[, idx]) - Extracts a group that matches \nregexp\n.\n\n\nExamples:\n\n\n> SELECT regexp_extract('100-200', '(\\d+)-(\\d+)', 1);\n 100\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nregexp_replace\n\n\nregexp_replace(str, regexp, rep) - Replaces all substrings of \nstr\n that match \nregexp\n with \nrep\n.\n\n\nExamples:\n\n\n> SELECT regexp_replace('100-200', '(\\d+)', 'num');\n num-num\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nrepeat\n\n\nrepeat(str, n) - Returns the string which repeats the given string value n times.\n\n\nExamples:\n\n\n> SELECT repeat('123', 2);\n 123123\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nreplace\n\n\nreplace(str, search[, replace]) - Replaces all occurrences of \nsearch\n with \nreplace\n.\n\n\nArguments:\n\n\n\n\nstr - a string expression\n\n\nsearch - a string expression. If \nsearch\n is not found in \nstr\n, \nstr\n is returned unchanged.\n\n\nreplace - a string expression. If \nreplace\n is not specified or is an empty string, nothing replaces\n    the string that is removed from \nstr\n.\n\n\n\n\nExamples:\n\n\n> SELECT replace('ABCabc', 'abc', 'DEF');\n ABCDEF\n\n\n\n\nSince:\n 2.3.0\n\n\n\n\nreverse\n\n\nreverse(str) - Returns the reversed given string.\n\n\nExamples:\n\n\n> SELECT reverse('Spark SQL');\n LQS krapS\n\n\n\n\n\n\nright\n\n\nright(str, len) - Returns the rightmost \nlen\n(\nlen\n can be string type) characters from the string \nstr\n,if \nlen\n is less or equal than 0 the result is an empty string.\n\n\nExamples:\n\n\n> SELECT right('Spark SQL', 3);\n SQL\n\n\n\n\nSince:\n 2.3.0\n\n\n\n\nrint\n\n\nrint(expr) - Returns the double value that is closest in value to the argument and is equal to a mathematical integer.\n\n\nExamples:\n\n\n> SELECT rint(12.3456);\n 12.0\n\n\n\n\n\n\nrlike\n\n\nstr rlike regexp - Returns true if \nstr\n matches \nregexp\n, or false otherwise.\n\n\nArguments:\n\n\n\n\nstr - a string expression\n\n\n\n\nregexp - a string expression. The pattern string should be a Java regular expression.\n\n\nSince Spark 2.0, string literals (including regex patterns) are unescaped in our SQL\nparser. For example, to match \"\\abc\", a regular expression for \nregexp\n can be\n\"^\\abc$\".\n\n\nThere is a SQL config 'spark.sql.parser.escapedStringLiterals' that can be used to\nfallback to the Spark 1.6 behavior regarding string literal parsing. For example,\nif the config is enabled, the \nregexp\n that can match \"\\abc\" is \"^\\abc$\".\n\n\n\n\n\n\nExamples:\n\n\nWhen spark.sql.parser.escapedStringLiterals is disabled (default).\n> SELECT '%SystemDrive%\\Users\\John' rlike '%SystemDrive%\\\\Users.*'\ntrue\n\nWhen spark.sql.parser.escapedStringLiterals is enabled.\n> SELECT '%SystemDrive%\\Users\\John' rlike '%SystemDrive%\\Users.*'\ntrue\n\n\n\n\nNote:\n\n\nUse LIKE to match with simple string pattern.\n\n\nSince:\n 1.0.0\n\n\n\n\nrollup\n\n\nrollup([col1[, col2 ..]]) - create a multi-dimensional rollup using the specified columns\nso that we can run aggregation on them.\n\n\nExamples:\n\n\n> SELECT name, age, count(*) FROM VALUES (2, 'Alice'), (5, 'Bob') people(age, name) GROUP BY rollup(name, age);\n  NULL    NULL    2\n  Alice   2       1\n  Bob     5       1\n  Bob     NULL    1\n  Alice   NULL    1\n\n\n\n\nSince:\n 2.0.0\n\n\n\n\nround\n\n\nround(expr, d) - Returns \nexpr\n rounded to \nd\n decimal places using HALF_UP rounding mode.\n\n\nExamples:\n\n\n> SELECT round(2.5, 0);\n 3.0\n\n\n\n\n\n\nrow_number\n\n\nrow_number() - Assigns a unique, sequential number to each row, starting with one,\naccording to the ordering of rows within the window partition.\n\n\n\n\nrpad\n\n\nrpad(str, len, pad) - Returns \nstr\n, right-padded with \npad\n to a length of \nlen\n.\nIf \nstr\n is longer than \nlen\n, the return value is shortened to \nlen\n characters.\n\n\nExamples:\n\n\n> SELECT rpad('hi', 5, '??');\n hi???\n> SELECT rpad('hi', 1, '??');\n h\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nrtrim\n\n\nrtrim(str) - Removes the trailing space characters from \nstr\n.\n\n\nrtrim(trimStr, str) - Removes the trailing string which contains the characters from the trim string from the \nstr\n\n\nArguments:\n\n\n\n\nstr - a string expression\n\n\ntrimStr - the trim string characters to trim, the default value is a single space\n\n\n\n\nExamples:\n\n\n> SELECT rtrim('    SparkSQL   ');\n SparkSQL\n> SELECT rtrim('LQSa', 'SSparkSQLS');\n SSpark\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nsecond\n\n\nsecond(timestamp) - Returns the second component of the string/timestamp.\n\n\nExamples:\n\n\n> SELECT second('2009-07-30 12:58:59');\n 59\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nsentences\n\n\nsentences(str[, lang, country]) - Splits \nstr\n into an array of array of words.\n\n\nExamples:\n\n\n> SELECT sentences('Hi there! Good morning.');\n [[\"Hi\",\"there\"],[\"Good\",\"morning\"]]\n\n\n\n\nSince:\n 2.0.0\n\n\n\n\nsha\n\n\nsha(expr) - Returns a sha1 hash value as a hex string of the \nexpr\n.\n\n\nExamples:\n\n\n> SELECT sha('Spark');\n 85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c\n\n\n\n\n\n\nsha1\n\n\nsha1(expr) - Returns a sha1 hash value as a hex string of the \nexpr\n.\n\n\nExamples:\n\n\n> SELECT sha1('Spark');\n 85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c\n\n\n\n\n\n\nsha2\n\n\nsha2(expr, bitLength) - Returns a checksum of SHA-2 family as a hex string of \nexpr\n.\nSHA-224, SHA-256, SHA-384, and SHA-512 are supported. Bit length of 0 is equivalent to 256.\n\n\nExamples:\n\n\n> SELECT sha2('Spark', 256);\n 529bc3b07127ecb7e53a4dcf1991d9152c24537d919178022b2c42657f79a26b\n\n\n\n\n\n\nshiftleft\n\n\nshiftleft(base, expr) - Bitwise left shift.\n\n\nExamples:\n\n\n> SELECT shiftleft(2, 1);\n 4\n\n\n\n\n\n\nshiftright\n\n\nshiftright(base, expr) - Bitwise (signed) right shift.\n\n\nExamples:\n\n\n> SELECT shiftright(4, 1);\n 2\n\n\n\n\n\n\nshiftrightunsigned\n\n\nshiftrightunsigned(base, expr) - Bitwise unsigned right shift.\n\n\nExamples:\n\n\n> SELECT shiftrightunsigned(4, 1);\n 2\n\n\n\n\n\n\nsign\n\n\nsign(expr) - Returns -1.0, 0.0 or 1.0 as \nexpr\n is negative, 0 or positive.\n\n\nExamples:\n\n\n> SELECT sign(40);\n 1.0\n\n\n\n\n\n\nsignum\n\n\nsignum(expr) - Returns -1.0, 0.0 or 1.0 as \nexpr\n is negative, 0 or positive.\n\n\nExamples:\n\n\n> SELECT signum(40);\n 1.0\n\n\n\n\n\n\nsin\n\n\nsin(expr) - Returns the sine of \nexpr\n, as if computed by \njava.lang.Math.sin\n.\n\n\nArguments:\n\n\n\n\nexpr - angle in radians\n\n\n\n\nExamples:\n\n\n> SELECT sin(0);\n 0.0\n\n\n\n\n\n\nsinh\n\n\nsinh(expr) - Returns hyperbolic sine of \nexpr\n, as if computed by \njava.lang.Math.sinh\n.\n\n\nArguments:\n\n\n\n\nexpr - hyperbolic angle\n\n\n\n\nExamples:\n\n\n> SELECT sinh(0);\n 0.0\n\n\n\n\n\n\nsize\n\n\nsize(expr) - Returns the size of an array or a map. Returns -1 if null.\n\n\nExamples:\n\n\n> SELECT size(array('b', 'd', 'c', 'a'));\n 4\n\n\n\n\n\n\nskewness\n\n\nskewness(expr) - Returns the skewness value calculated from values of a group.\n\n\n\n\nsmallint\n\n\nsmallint(expr) - Casts the value \nexpr\n to the target data type \nsmallint\n.\n\n\n\n\nsort_array\n\n\nsort_array(array[, ascendingOrder]) - Sorts the input array in ascending or descending order according to the natural ordering of the array elements.\n\n\nExamples:\n\n\n> SELECT sort_array(array('b', 'd', 'c', 'a'), true);\n [\"a\",\"b\",\"c\",\"d\"]\n\n\n\n\n\n\nsoundex\n\n\nsoundex(str) - Returns Soundex code of the string.\n\n\nExamples:\n\n\n> SELECT soundex('Miller');\n M460\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nspace\n\n\nspace(n) - Returns a string consisting of \nn\n spaces.\n\n\nExamples:\n\n\n> SELECT concat(space(2), '1');\n   1\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nspark_partition_id\n\n\nspark_partition_id() - Returns the current partition id.\n\n\n\n\nsplit\n\n\nsplit(str, regex) - Splits \nstr\n around occurrences that match \nregex\n.\n\n\nExamples:\n\n\n> SELECT split('oneAtwoBthreeC', '[ABC]');\n [\"one\",\"two\",\"three\",\"\"]\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nsqrt\n\n\nsqrt(expr) - Returns the square root of \nexpr\n.\n\n\nExamples:\n\n\n> SELECT sqrt(4);\n 2.0\n\n\n\n\n\n\nstack\n\n\nstack(n, expr1, ..., exprk) - Separates \nexpr1\n, ..., \nexprk\n into \nn\n rows.\n\n\nExamples:\n\n\n> SELECT stack(2, 1, 2, 3);\n 1  2\n 3  NULL\n\n\n\n\n\n\nstd\n\n\nstd(expr) - Returns the sample standard deviation calculated from values of a group.\n\n\n\n\nstddev\n\n\nstddev(expr) - Returns the sample standard deviation calculated from values of a group.\n\n\n\n\nstddev_pop\n\n\nstddev_pop(expr) - Returns the population standard deviation calculated from values of a group.\n\n\n\n\nstddev_samp\n\n\nstddev_samp(expr) - Returns the sample standard deviation calculated from values of a group.\n\n\n\n\nstr_to_map\n\n\nstr_to_map(text[, pairDelim[, keyValueDelim]]) - Creates a map after splitting the text into key/value pairs using delimiters. Default delimiters are ',' for \npairDelim\n and ':' for \nkeyValueDelim\n.\n\n\nExamples:\n\n\n> SELECT str_to_map('a:1,b:2,c:3', ',', ':');\n map(\"a\":\"1\",\"b\":\"2\",\"c\":\"3\")\n> SELECT str_to_map('a');\n map(\"a\":null)\n\n\n\n\n\n\nstring\n\n\nstring(expr) - Casts the value \nexpr\n to the target data type \nstring\n.\n\n\n\n\nstruct\n\n\nstruct(col1, col2, col3, ...) - Creates a struct with the given field values.\n\n\n\n\nsubstr\n\n\nsubstr(str, pos[, len]) - Returns the substring of \nstr\n that starts at \npos\n and is of length \nlen\n, or the slice of byte array that starts at \npos\n and is of length \nlen\n.\n\n\nExamples:\n\n\n> SELECT substr('Spark SQL', 5);\n k SQL\n> SELECT substr('Spark SQL', -3);\n SQL\n> SELECT substr('Spark SQL', 5, 1);\n k\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nsubstring\n\n\nsubstring(str, pos[, len]) - Returns the substring of \nstr\n that starts at \npos\n and is of length \nlen\n, or the slice of byte array that starts at \npos\n and is of length \nlen\n.\n\n\nExamples:\n\n\n> SELECT substring('Spark SQL', 5);\n k SQL\n> SELECT substring('Spark SQL', -3);\n SQL\n> SELECT substring('Spark SQL', 5, 1);\n k\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nsubstring_index\n\n\nsubstring_index(str, delim, count) - Returns the substring from \nstr\n before \ncount\n occurrences of the delimiter \ndelim\n.\nIf \ncount\n is positive, everything to the left of the final delimiter (counting from the\nleft) is returned. If \ncount\n is negative, everything to the right of the final delimiter\n(counting from the right) is returned. The function substring_index performs a case-sensitive match\nwhen searching for \ndelim\n.\n\n\nExamples:\n\n\n> SELECT substring_index('www.apache.org', '.', 2);\n www.apache\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nsum\n\n\nsum(expr) - Returns the sum calculated from values of a group.\n\n\n\n\ntan\n\n\ntan(expr) - Returns the tangent of \nexpr\n, as if computed by \njava.lang.Math.tan\n.\n\n\nArguments:\n\n\n\n\nexpr - angle in radians\n\n\n\n\nExamples:\n\n\n> SELECT tan(0);\n 0.0\n\n\n\n\n\n\ntanh\n\n\ntanh(expr) - Returns the hyperbolic tangent of \nexpr\n, as if computed by\n\njava.lang.Math.tanh\n.\n\n\nArguments:\n\n\n\n\nexpr - hyperbolic angle\n\n\n\n\nExamples:\n\n\n> SELECT tanh(0);\n 0.0\n\n\n\n\n\n\ntimestamp\n\n\ntimestamp(expr) - Casts the value \nexpr\n to the target data type \ntimestamp\n.\n\n\n\n\ntinyint\n\n\ntinyint(expr) - Casts the value \nexpr\n to the target data type \ntinyint\n.\n\n\n\n\nto_date\n\n\nto_date(date_str[, fmt]) - Parses the \ndate_str\n expression with the \nfmt\n expression to\na date. Returns null with invalid input. By default, it follows casting rules to a date if\nthe \nfmt\n is omitted.\n\n\nExamples:\n\n\n> SELECT to_date('2009-07-30 04:17:52');\n 2009-07-30\n> SELECT to_date('2016-12-31', 'yyyy-MM-dd');\n 2016-12-31\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nto_json\n\n\nto_json(expr[, options]) - Returns a json string with a given struct value\n\n\nExamples:\n\n\n> SELECT to_json(named_struct('a', 1, 'b', 2));\n {\"a\":1,\"b\":2}\n> SELECT to_json(named_struct('time', to_timestamp('2015-08-26', 'yyyy-MM-dd')), map('timestampFormat', 'dd/MM/yyyy'));\n {\"time\":\"26/08/2015\"}\n> SELECT to_json(array(named_struct('a', 1, 'b', 2)));\n [{\"a\":1,\"b\":2}]\n> SELECT to_json(map('a', named_struct('b', 1)));\n {\"a\":{\"b\":1}}\n> SELECT to_json(map(named_struct('a', 1),named_struct('b', 2)));\n {\"[1]\":{\"b\":2}}\n> SELECT to_json(map('a', 1));\n {\"a\":1}\n> SELECT to_json(array((map('a', 1))));\n [{\"a\":1}]\n\n\n\n\nSince:\n 2.2.0\n\n\n\n\nto_timestamp\n\n\nto_timestamp(timestamp[, fmt]) - Parses the \ntimestamp\n expression with the \nfmt\n expression to\na timestamp. Returns null with invalid input. By default, it follows casting rules to\na timestamp if the \nfmt\n is omitted.\n\n\nExamples:\n\n\n> SELECT to_timestamp('2016-12-31 00:12:00');\n 2016-12-31 00:12:00\n> SELECT to_timestamp('2016-12-31', 'yyyy-MM-dd');\n 2016-12-31 00:00:00\n\n\n\n\nSince:\n 2.2.0\n\n\n\n\nto_unix_timestamp\n\n\nto_unix_timestamp(expr[, pattern]) - Returns the UNIX timestamp of the given time.\n\n\nExamples:\n\n\n> SELECT to_unix_timestamp('2016-04-08', 'yyyy-MM-dd');\n 1460041200\n\n\n\n\nSince:\n 1.6.0\n\n\n\n\nto_utc_timestamp\n\n\nto_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'.\n\n\nExamples:\n\n\n> SELECT to_utc_timestamp('2016-08-31', 'Asia/Seoul');\n 2016-08-30 15:00:00\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\ntranslate\n\n\ntranslate(input, from, to) - Translates the \ninput\n string by replacing the characters present in the \nfrom\n string with the corresponding characters in the \nto\n string.\n\n\nExamples:\n\n\n> SELECT translate('AaBbCc', 'abc', '123');\n A1B2C3\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\ntrim\n\n\ntrim(str) - Removes the leading and trailing space characters from \nstr\n.\n\n\ntrim(BOTH trimStr FROM str) - Remove the leading and trailing \ntrimStr\n characters from \nstr\n\n\ntrim(LEADING trimStr FROM str) - Remove the leading \ntrimStr\n characters from \nstr\n\n\ntrim(TRAILING trimStr FROM str) - Remove the trailing \ntrimStr\n characters from \nstr\n\n\nArguments:\n\n\n\n\nstr - a string expression\n\n\ntrimStr - the trim string characters to trim, the default value is a single space\n\n\nBOTH, FROM - these are keywords to specify trimming string characters from both ends of\n    the string\n\n\nLEADING, FROM - these are keywords to specify trimming string characters from the left\n    end of the string\n\n\nTRAILING, FROM - these are keywords to specify trimming string characters from the right\n    end of the string\n\n\n\n\nExamples:\n\n\n> SELECT trim('    SparkSQL   ');\n SparkSQL\n> SELECT trim('SL', 'SSparkSQLS');\n parkSQ\n> SELECT trim(BOTH 'SL' FROM 'SSparkSQLS');\n parkSQ\n> SELECT trim(LEADING 'SL' FROM 'SSparkSQLS');\n parkSQLS\n> SELECT trim(TRAILING 'SL' FROM 'SSparkSQLS');\n SSparkSQ\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\ntrunc\n\n\ntrunc(date, fmt) - Returns \ndate\n with the time portion of the day truncated to the unit specified by the format model \nfmt\n.\n\nfmt\n should be one of [\"year\", \"yyyy\", \"yy\", \"mon\", \"month\", \"mm\"]\n\n\nExamples:\n\n\n> SELECT trunc('2009-02-12', 'MM');\n 2009-02-01\n> SELECT trunc('2015-10-27', 'YEAR');\n 2015-01-01\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nucase\n\n\nucase(str) - Returns \nstr\n with all characters changed to uppercase.\n\n\nExamples:\n\n\n> SELECT ucase('SparkSql');\n SPARKSQL\n\n\n\n\nSince:\n 1.0.1\n\n\n\n\nunbase64\n\n\nunbase64(str) - Converts the argument from a base 64 string \nstr\n to a binary.\n\n\nExamples:\n\n\n> SELECT unbase64('U3BhcmsgU1FM');\n Spark SQL\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nunhex\n\n\nunhex(expr) - Converts hexadecimal \nexpr\n to binary.\n\n\nExamples:\n\n\n> SELECT decode(unhex('537061726B2053514C'), 'UTF-8');\n Spark SQL\n\n\n\n\n\n\nunix_timestamp\n\n\nunix_timestamp([expr[, pattern]]) - Returns the UNIX timestamp of current or specified time.\n\n\nExamples:\n\n\n> SELECT unix_timestamp();\n 1476884637\n> SELECT unix_timestamp('2016-04-08', 'yyyy-MM-dd');\n 1460041200\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nupper\n\n\nupper(str) - Returns \nstr\n with all characters changed to uppercase.\n\n\nExamples:\n\n\n> SELECT upper('SparkSql');\n SPARKSQL\n\n\n\n\nSince:\n 1.0.1\n\n\n\n\nuuid\n\n\nuuid() - Returns an universally unique identifier (UUID) string. The value is returned as a canonical UUID 36-character string.\n\n\nExamples:\n\n\n> SELECT uuid();\n 46707d92-02f4-4817-8116-a4c3b23e6266\n\n\n\n\n\n\nvar_pop\n\n\nvar_pop(expr) - Returns the population variance calculated from values of a group.\n\n\n\n\nvar_samp\n\n\nvar_samp(expr) - Returns the sample variance calculated from values of a group.\n\n\n\n\nvariance\n\n\nvariance(expr) - Returns the sample variance calculated from values of a group.\n\n\n\n\nweekofyear\n\n\nweekofyear(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.\n\n\nExamples:\n\n\n> SELECT weekofyear('2008-02-20');\n 8\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\nwhen\n\n\nCASE WHEN expr1 THEN expr2 [WHEN expr3 THEN expr4]* [ELSE expr5] END - When \nexpr1\n = true, returns \nexpr2\n; else when \nexpr3\n = true, returns \nexpr4\n; else returns \nexpr5\n.\n\n\nArguments:\n\n\n\n\nexpr1, expr3 - the branch condition expressions should all be boolean type.\n\n\nexpr2, expr4, expr5 - the branch value expressions and else value expression should all be\n    same type or coercible to a common type.\n\n\n\n\nExamples:\n\n\n> SELECT CASE WHEN 1 > 0 THEN 1 WHEN 2 > 0 THEN 2.0 ELSE 1.2 END;\n 1\n> SELECT CASE WHEN 1 < 0 THEN 1 WHEN 2 > 0 THEN 2.0 ELSE 1.2 END;\n 2\n> SELECT CASE WHEN 1 < 0 THEN 1 WHEN 2 < 0 THEN 2.0 END;\n NULL\n\n\n\n\n\n\nwindow\n\n\n\n\nxpath\n\n\nxpath(xml, xpath) - Returns a string array of values within the nodes of xml that match the XPath expression.\n\n\nExamples:\n\n\n> SELECT xpath('<a><b>b1</b><b>b2</b><b>b3</b><c>c1</c><c>c2</c></a>','a/b/text()');\n ['b1','b2','b3']\n\n\n\n\n\n\nxpath_boolean\n\n\nxpath_boolean(xml, xpath) - Returns true if the XPath expression evaluates to true, or if a matching node is found.\n\n\nExamples:\n\n\n> SELECT xpath_boolean('<a><b>1</b></a>','a/b');\n true\n\n\n\n\n\n\nxpath_double\n\n\nxpath_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.\n\n\nExamples:\n\n\n> SELECT xpath_double('<a><b>1</b><b>2</b></a>', 'sum(a/b)');\n 3.0\n\n\n\n\n\n\nxpath_float\n\n\nxpath_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.\n\n\nExamples:\n\n\n> SELECT xpath_float('<a><b>1</b><b>2</b></a>', 'sum(a/b)');\n 3.0\n\n\n\n\n\n\nxpath_int\n\n\nxpath_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.\n\n\nExamples:\n\n\n> SELECT xpath_int('<a><b>1</b><b>2</b></a>', 'sum(a/b)');\n 3\n\n\n\n\n\n\nxpath_long\n\n\nxpath_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.\n\n\nExamples:\n\n\n> SELECT xpath_long('<a><b>1</b><b>2</b></a>', 'sum(a/b)');\n 3\n\n\n\n\n\n\nxpath_number\n\n\nxpath_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.\n\n\nExamples:\n\n\n> SELECT xpath_number('<a><b>1</b><b>2</b></a>', 'sum(a/b)');\n 3.0\n\n\n\n\n\n\nxpath_short\n\n\nxpath_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.\n\n\nExamples:\n\n\n> SELECT xpath_short('<a><b>1</b><b>2</b></a>', 'sum(a/b)');\n 3\n\n\n\n\n\n\nxpath_string\n\n\nxpath_string(xml, xpath) - Returns the text contents of the first xml node that matches the XPath expression.\n\n\nExamples:\n\n\n> SELECT xpath_string('<a><b>b</b><c>cc</c></a>','a/c');\n cc\n\n\n\n\n\n\nyear\n\n\nyear(date) - Returns the year component of the date/timestamp.\n\n\nExamples:\n\n\n> SELECT year('2016-07-30');\n 2016\n\n\n\n\nSince:\n 1.5.0\n\n\n\n\n|\n\n\nexpr1 | expr2 - Returns the result of bitwise OR of \nexpr1\n and \nexpr2\n.\n\n\nExamples:\n\n\n> SELECT 3 | 5;\n 7\n\n\n\n\n\n\n~\n\n\n~ expr - Returns the result of bitwise NOT of \nexpr\n.\n\n\nExamples:\n\n\n> SELECT ~ 0;\n -1",
            "title": "Functions"
        },
        {
            "location": "/#_1",
            "text": "! expr - Logical not.",
            "title": "!"
        },
        {
            "location": "/#_2",
            "text": "expr1 % expr2 - Returns the remainder after  expr1 / expr2 .  Examples:  > SELECT 2 % 1.8;\n 0.2\n> SELECT MOD(2, 1.8);\n 0.2",
            "title": "%"
        },
        {
            "location": "/#_3",
            "text": "expr1 & expr2 - Returns the result of bitwise AND of  expr1  and  expr2 .  Examples:  > SELECT 3 & 5;\n 1",
            "title": "&amp;"
        },
        {
            "location": "/#_4",
            "text": "expr1 * expr2 - Returns  expr1 * expr2 .  Examples:  > SELECT 2 * 3;\n 6",
            "title": "*"
        },
        {
            "location": "/#_5",
            "text": "expr1 + expr2 - Returns  expr1 + expr2 .  Examples:  > SELECT 1 + 2;\n 3",
            "title": "+"
        },
        {
            "location": "/#-",
            "text": "expr1 - expr2 - Returns  expr1 - expr2 .  Examples:  > SELECT 2 - 1;\n 1",
            "title": "-"
        },
        {
            "location": "/#_6",
            "text": "expr1 / expr2 - Returns  expr1 / expr2 . It always performs floating point division.  Examples:  > SELECT 3 / 2;\n 1.5\n> SELECT 2L / 2L;\n 1.0",
            "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,\n    and must be a type that can be ordered. For example, map type is not orderable, so it\n    is not supported. For complex types such array/struct, the data types of fields must\n    be orderable.   Examples:  > SELECT 1 < 2;\n true\n> SELECT 1.1 < '1';\n false\n> SELECT to_date('2009-07-30 04:17:52') < to_date('2009-07-30 04:17:52');\n false\n> SELECT to_date('2009-07-30 04:17:52') < to_date('2009-08-01 04:17:52');\n true\n> SELECT 1 < NULL;\n NULL",
            "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,\n    and must be a type that can be ordered. For example, map type is not orderable, so it\n    is not supported. For complex types such array/struct, the data types of fields must\n    be orderable.   Examples:  > SELECT 2 <= 2;\n true\n> SELECT 1.0 <= '1';\n true\n> SELECT to_date('2009-07-30 04:17:52') <= to_date('2009-07-30 04:17:52');\n true\n> SELECT to_date('2009-07-30 04:17:52') <= to_date('2009-08-01 04:17:52');\n true\n> SELECT 1 <= NULL;\n NULL",
            "title": "&lt;="
        },
        {
            "location": "/#_9",
            "text": "expr1 <=> expr2 - Returns same result as the EQUAL(=) operator for non-null operands,\nbut 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,\n    and must be a type that can be used in equality comparison. Map type is not supported.\n    For complex types such array/struct, the data types of fields must be orderable.   Examples:  > SELECT 2 <=> 2;\n true\n> SELECT 1 <=> '1';\n true\n> SELECT true <=> NULL;\n false\n> SELECT NULL <=> NULL;\n true",
            "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,\n    and must be a type that can be used in equality comparison. Map type is not supported.\n    For complex types such array/struct, the data types of fields must be orderable.   Examples:  > SELECT 2 = 2;\n true\n> SELECT 1 = '1';\n true\n> SELECT true = NULL;\n NULL\n> SELECT NULL = NULL;\n NULL",
            "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,\n    and must be a type that can be used in equality comparison. Map type is not supported.\n    For complex types such array/struct, the data types of fields must be orderable.   Examples:  > SELECT 2 == 2;\n true\n> SELECT 1 == '1';\n true\n> SELECT true == NULL;\n NULL\n> SELECT NULL == NULL;\n NULL",
            "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,\n    and must be a type that can be ordered. For example, map type is not orderable, so it\n    is not supported. For complex types such array/struct, the data types of fields must\n    be orderable.   Examples:  > SELECT 2 > 1;\n true\n> SELECT 2 > '1.1';\n true\n> SELECT to_date('2009-07-30 04:17:52') > to_date('2009-07-30 04:17:52');\n false\n> SELECT to_date('2009-07-30 04:17:52') > to_date('2009-08-01 04:17:52');\n false\n> SELECT 1 > NULL;\n NULL",
            "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,\n    and must be a type that can be ordered. For example, map type is not orderable, so it\n    is not supported. For complex types such array/struct, the data types of fields must\n    be orderable.   Examples:  > SELECT 2 >= 1;\n true\n> SELECT 2.0 >= '2.1';\n false\n> SELECT to_date('2009-07-30 04:17:52') >= to_date('2009-07-30 04:17:52');\n true\n> SELECT to_date('2009-07-30 04:17:52') >= to_date('2009-08-01 04:17:52');\n false\n> SELECT 1 >= NULL;\n NULL",
            "title": "&gt;="
        },
        {
            "location": "/#_14",
            "text": "expr1 ^ expr2 - Returns the result of bitwise exclusive OR of  expr1  and  expr2 .  Examples:  > SELECT 3 ^ 5;\n 6",
            "title": "^"
        },
        {
            "location": "/#abs",
            "text": "abs(expr) - Returns the absolute value of the numeric value.  Examples:  > SELECT abs(-1);\n 1",
            "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);\n 0.0\n> SELECT acos(2);\n NaN",
            "title": "acos"
        },
        {
            "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);\n 2016-09-30  Since:  1.5.0",
            "title": "add_months"
        },
        {
            "location": "/#and",
            "text": "expr1 and expr2 - Logical AND.",
            "title": "and"
        },
        {
            "location": "/#approx_count_distinct",
            "text": "approx_count_distinct(expr[, relativeSD]) - Returns the estimated cardinality by HyperLogLog++. relativeSD  defines the maximum estimation error allowed.",
            "title": "approx_count_distinct"
        },
        {
            "location": "/#approx_percentile",
            "text": "approx_percentile(col, percentage [, accuracy]) - Returns the approximate percentile value of numeric\ncolumn  col  at the given percentage. The value of percentage must be between 0.0\nand 1.0. The  accuracy  parameter (default: 10000) is a positive numeric literal which\ncontrols approximation accuracy at the cost of memory. Higher value of  accuracy  yields\nbetter accuracy,  1.0/accuracy  is the relative error of the approximation.\nWhen  percentage  is an array, each value of the percentage array must be between 0.0 and 1.0.\nIn this case, returns the approximate percentile array of column  col  at the given\npercentage array.  Examples:  > SELECT approx_percentile(10.0, array(0.5, 0.4, 0.1), 100);\n [10.0,10.0,10.0]\n> SELECT approx_percentile(10.0, 0.5, 100);\n 10.0",
            "title": "approx_percentile"
        },
        {
            "location": "/#array",
            "text": "array(expr, ...) - Returns an array with the given elements.  Examples:  > SELECT array(1, 2, 3);\n [1,2,3]",
            "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);\n true",
            "title": "array_contains"
        },
        {
            "location": "/#ascii",
            "text": "ascii(str) - Returns the numeric value of the first character of  str .  Examples:  > SELECT ascii('222');\n 50\n> SELECT ascii(2);\n 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 ,\nas if computed by  java.lang.Math.asin .  Examples:  > SELECT asin(0);\n 0.0\n> SELECT asin(2);\n NaN",
            "title": "asin"
        },
        {
            "location": "/#assert_true",
            "text": "assert_true(expr) - Throws an exception if  expr  is not true.  Examples:  > SELECT assert_true(0 < 1);\n NULL",
            "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);\n 0.0",
            "title": "atan"
        },
        {
            "location": "/#atan2",
            "text": "atan2(exprY, exprX) - Returns the angle in radians between the positive x-axis of a plane\nand 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);\n 0.0",
            "title": "atan2"
        },
        {
            "location": "/#avg",
            "text": "avg(expr) - Returns the mean calculated from values of a group.",
            "title": "avg"
        },
        {
            "location": "/#base64",
            "text": "base64(bin) - Converts the argument from a binary  bin  to a base 64 string.  Examples:  > SELECT base64('Spark SQL');\n U3BhcmsgU1FM  Since:  1.5.0",
            "title": "base64"
        },
        {
            "location": "/#bigint",
            "text": "bigint(expr) - Casts the value  expr  to the target data type  bigint .",
            "title": "bigint"
        },
        {
            "location": "/#bin",
            "text": "bin(expr) - Returns the string representation of the long value  expr  represented in binary.  Examples:  > SELECT bin(13);\n 1101\n> SELECT bin(-13);\n 1111111111111111111111111111111111111111111111111111111111110011\n> SELECT bin(13.3);\n 1101",
            "title": "bin"
        },
        {
            "location": "/#binary",
            "text": "binary(expr) - Casts the value  expr  to the target data type  binary .",
            "title": "binary"
        },
        {
            "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');\n 72  Since:  2.3.0",
            "title": "bit_length"
        },
        {
            "location": "/#boolean",
            "text": "boolean(expr) - Casts the value  expr  to the target data type  boolean .",
            "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);\n 2.0",
            "title": "bround"
        },
        {
            "location": "/#cast",
            "text": "cast(expr AS type) - Casts the value  expr  to the target data type  type .  Examples:  > SELECT cast('10' as int);\n 10",
            "title": "cast"
        },
        {
            "location": "/#cbrt",
            "text": "cbrt(expr) - Returns the cube root of  expr .  Examples:  > SELECT cbrt(27.0);\n 3.0",
            "title": "cbrt"
        },
        {
            "location": "/#ceil",
            "text": "ceil(expr) - Returns the smallest integer not smaller than  expr .  Examples:  > SELECT ceil(-0.1);\n 0\n> SELECT ceil(5);\n 5",
            "title": "ceil"
        },
        {
            "location": "/#ceiling",
            "text": "ceiling(expr) - Returns the smallest integer not smaller than  expr .  Examples:  > SELECT ceiling(-0.1);\n 0\n> SELECT ceiling(5);\n 5",
            "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);\n 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 ');\n 10\n> SELECT CHAR_LENGTH('Spark SQL ');\n 10\n> SELECT CHARACTER_LENGTH('Spark SQL ');\n 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 ');\n 10\n> SELECT CHAR_LENGTH('Spark SQL ');\n 10\n> SELECT CHARACTER_LENGTH('Spark SQL ');\n 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);\n 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);\n 1  Since:  1.0.0",
            "title": "coalesce"
        },
        {
            "location": "/#collect_list",
            "text": "collect_list(expr) - Collects and returns a list of non-unique elements.",
            "title": "collect_list"
        },
        {
            "location": "/#collect_set",
            "text": "collect_set(expr) - Collects and returns a set of unique elements.",
            "title": "collect_set"
        },
        {
            "location": "/#concat",
            "text": "concat(str1, str2, ..., strN) - Returns the concatenation of str1, str2, ..., strN.  Examples:  > SELECT concat('Spark', 'SQL');\n SparkSQL",
            "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');\n  Spark SQL  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);\n 4\n> SELECT conv(-10, 16, -10);\n -16",
            "title": "conv"
        },
        {
            "location": "/#corr",
            "text": "corr(expr1, expr2) - Returns Pearson coefficient of correlation between a set of number pairs.",
            "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);\n 1.0",
            "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);\n 1.0",
            "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);\n 0.6420926159343306",
            "title": "cot"
        },
        {
            "location": "/#count",
            "text": "count(*) - Returns the total number of retrieved rows, including rows containing null.  count(expr) - Returns the number of rows for which the supplied expression is non-null.  count(DISTINCT expr[, expr...]) - Returns the number of rows for which the supplied expression(s) are unique and non-null.",
            "title": "count"
        },
        {
            "location": "/#count_min_sketch",
            "text": "count_min_sketch(col, eps, confidence, seed) - Returns a count-min sketch of a column with the given esp,\nconfidence 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\ncardinality estimation using sub-linear space.",
            "title": "count_min_sketch"
        },
        {
            "location": "/#covar_pop",
            "text": "covar_pop(expr1, expr2) - Returns the population covariance of a set of number pairs.",
            "title": "covar_pop"
        },
        {
            "location": "/#covar_samp",
            "text": "covar_samp(expr1, expr2) - Returns the sample covariance of a set of number pairs.",
            "title": "covar_samp"
        },
        {
            "location": "/#crc32",
            "text": "crc32(expr) - Returns a cyclic redundancy check value of the  expr  as a bigint.  Examples:  > SELECT crc32('Spark');\n 1557323817",
            "title": "crc32"
        },
        {
            "location": "/#cube",
            "text": "cube([col1[, col2 ..]]) - create a multi-dimensional cube using the specified columns\nso 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);\n  NULL    2       1\n  NULL    NULL    2\n  Alice   2       1\n  Bob     5       1\n  NULL    5       1\n  Bob     NULL    1\n  Alice   NULL    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.",
            "title": "cume_dist"
        },
        {
            "location": "/#current_database",
            "text": "current_database() - Returns the current database.  Examples:  > SELECT current_database();\n default",
            "title": "current_database"
        },
        {
            "location": "/#current_date",
            "text": "current_date() - Returns the current date at the start of query evaluation.  Since:  1.5.0",
            "title": "current_date"
        },
        {
            "location": "/#current_timestamp",
            "text": "current_timestamp() - Returns the current timestamp at the start of query evaluation.  Since:  1.5.0",
            "title": "current_timestamp"
        },
        {
            "location": "/#date",
            "text": "date(expr) - Casts the value  expr  to the target data type  date .",
            "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);\n 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 .  Examples:  > SELECT date_format('2016-04-08', 'y');\n 2016  Since:  1.5.0",
            "title": "date_format"
        },
        {
            "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);\n 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 . fmt  should be one of [\"YEAR\", \"YYYY\", \"YY\", \"MON\", \"MONTH\", \"MM\", \"DAY\", \"DD\", \"HOUR\", \"MINUTE\", \"SECOND\", \"WEEK\", \"QUARTER\"]  Examples:  > SELECT date_trunc('YEAR', '2015-03-05T09:32:05.359');\n 2015-01-01 00:00:00\n> SELECT date_trunc('MM', '2015-03-05T09:32:05.359');\n 2015-03-01 00:00:00\n> SELECT date_trunc('DD', '2015-03-05T09:32:05.359');\n 2015-03-05 00:00:00\n> SELECT date_trunc('HOUR', '2015-03-05T09:32:05.359');\n 2015-03-05 09:00:00  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');\n 1\n\n> SELECT datediff('2009-07-30', '2009-07-31');\n -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');\n 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');\n 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');\n 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');\n 100  Since:  1.5.0",
            "title": "dayofyear"
        },
        {
            "location": "/#decimal",
            "text": "decimal(expr) - Casts the value  expr  to the target data type  decimal .",
            "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');\n 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);\n 180.0",
            "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\npreviously assigned rank value. Unlike the function rank, dense_rank will not produce gaps\nin the ranking sequence.",
            "title": "dense_rank"
        },
        {
            "location": "/#double",
            "text": "double(expr) - Casts the value  expr  to the target data type  double .",
            "title": "double"
        },
        {
            "location": "/#e",
            "text": "e() - Returns Euler's number, e.  Examples:  > SELECT e();\n 2.718281828459045",
            "title": "e"
        },
        {
            "location": "/#elt",
            "text": "elt(n, input1, input2, ...) - Returns the  n -th input, e.g., returns  input2  when  n  is 2.  Examples:  > SELECT elt(1, 'scala', 'java');\n 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');\n abc  Since:  1.5.0",
            "title": "encode"
        },
        {
            "location": "/#exp",
            "text": "exp(expr) - Returns e to the power of  expr .  Examples:  > SELECT exp(0);\n 1.0",
            "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.  Examples:  > SELECT explode(array(10, 20));\n 10\n 20",
            "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.  Examples:  > SELECT explode_outer(array(10, 20));\n 10\n 20",
            "title": "explode_outer"
        },
        {
            "location": "/#expm1",
            "text": "expm1(expr) - Returns exp( expr ) - 1.  Examples:  > SELECT expm1(0);\n 0.0",
            "title": "expm1"
        },
        {
            "location": "/#factorial",
            "text": "factorial(expr) - Returns the factorial of  expr .  expr  is [0..20]. Otherwise, null.  Examples:  > SELECT factorial(5);\n 120",
            "title": "factorial"
        },
        {
            "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 ).\nReturns 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');\n 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.\nIf  isIgnoreNull  is true, returns only non-null values.",
            "title": "first"
        },
        {
            "location": "/#first_value",
            "text": "first_value(expr[, isIgnoreNull]) - Returns the first value of  expr  for a group of rows.\nIf  isIgnoreNull  is true, returns only non-null values.",
            "title": "first_value"
        },
        {
            "location": "/#float",
            "text": "float(expr) - Casts the value  expr  to the target data type  float .",
            "title": "float"
        },
        {
            "location": "/#floor",
            "text": "floor(expr) - Returns the largest integer not greater than  expr .  Examples:  > SELECT floor(-0.1);\n -1\n> SELECT floor(5);\n 5",
            "title": "floor"
        },
        {
            "location": "/#format_number",
            "text": "format_number(expr1, expr2) - Formats the number  expr1  like '#,###,###.##', rounded to  expr2 \ndecimal places. If  expr2  is 0, the result has no decimal point or fractional part.\nThis is supposed to function like MySQL's FORMAT.  Examples:  > SELECT format_number(12332.123456, 4);\n 12,332.1235  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\");\n Hello World 100 days  Since:  1.5.0",
            "title": "format_string"
        },
        {
            "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');\n {\"a\":1, \"b\":0.8}\n> SELECT from_json('{\"time\":\"26/08/2015\"}', 'time Timestamp', map('timestampFormat', 'dd/MM/yyyy'));\n {\"time\":\"2015-08-26 00:00:00.0\"}  Since:  2.2.0",
            "title": "from_json"
        },
        {
            "location": "/#from_unixtime",
            "text": "from_unixtime(unix_time, format) - Returns  unix_time  in the specified  format .  Examples:  > SELECT from_unixtime(0, 'yyyy-MM-dd HH:mm:ss');\n 1970-01-01 00:00:00  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');\n 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');\n b",
            "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);\n 10",
            "title": "greatest"
        },
        {
            "location": "/#grouping",
            "text": "grouping(col) - indicates whether a specified column in a GROUP BY is aggregated or\nnot, 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);\n  Alice   0       2\n  NULL    1       7\n  Bob     0       5  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);\n  NULL    2       2       165.0\n  Alice   0       2       165.0\n  NULL    2       5       180.0\n  NULL    3       7       172.5\n  Bob     0       5       180.0\n  Bob     1       5       180.0\n  Alice   1       2       165.0  Note:  Input columns should match with grouping columns exactly, or empty (means all the grouping\ncolumns).  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);\n -1321691492",
            "title": "hash"
        },
        {
            "location": "/#hex",
            "text": "hex(expr) - Converts  expr  to hexadecimal.  Examples:  > SELECT hex(17);\n 11\n> SELECT hex('Spark SQL');\n 537061726B2053514C",
            "title": "hex"
        },
        {
            "location": "/#hour",
            "text": "hour(timestamp) - Returns the hour component of the string/timestamp.  Examples:  > SELECT hour('2009-07-30 12:58:59');\n 12  Since:  1.5.0",
            "title": "hour"
        },
        {
            "location": "/#hypot",
            "text": "hypot(expr1, expr2) - Returns sqrt( expr1 2 +  expr2 2).  Examples:  > SELECT hypot(3, 4);\n 5.0",
            "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');\n a",
            "title": "if"
        },
        {
            "location": "/#ifnull",
            "text": "ifnull(expr1, expr2) - Returns  expr2  if  expr1  is null, or  expr1  otherwise.  Examples:  > SELECT ifnull(NULL, array('2'));\n [\"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);\n true\n> SELECT 1 in(2, 3, 4);\n false\n> SELECT named_struct('a', 1, 'b', 2) in(named_struct('a', 1, 'b', 1), named_struct('a', 1, 'b', 3));\n false\n> SELECT named_struct('a', 1, 'b', 2) in(named_struct('a', 1, 'b', 2), named_struct('a', 1, 'b', 3));\n true",
            "title": "in"
        },
        {
            "location": "/#initcap",
            "text": "initcap(str) - Returns  str  with the first letter of each word in uppercase.\nAll other letters are in lowercase. Words are delimited by white space.  Examples:  > SELECT initcap('sPark sql');\n Spark Sql  Since:  1.5.0",
            "title": "initcap"
        },
        {
            "location": "/#inline",
            "text": "inline(expr) - Explodes an array of structs into a table.  Examples:  > SELECT inline(array(struct(1, 'a'), struct(2, 'b')));\n 1  a\n 2  b",
            "title": "inline"
        },
        {
            "location": "/#inline_outer",
            "text": "inline_outer(expr) - Explodes an array of structs into a table.  Examples:  > SELECT inline_outer(array(struct(1, 'a'), struct(2, 'b')));\n 1  a\n 2  b",
            "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.",
            "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.",
            "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.",
            "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');\n 6  Since:  1.5.0",
            "title": "instr"
        },
        {
            "location": "/#int",
            "text": "int(expr) - Casts the value  expr  to the target data type  int .",
            "title": "int"
        },
        {
            "location": "/#isnan",
            "text": "isnan(expr) - Returns true if  expr  is NaN, or false otherwise.  Examples:  > SELECT isnan(cast('NaN' as double));\n 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);\n 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);\n 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');\n c33fb387-8500-4bfa-81d2-6e0e3e930df2\n> SELECT java_method('java.util.UUID', 'fromString', 'a5cf6c42-0c85-418f-af6c-3e4e5b1328f2');\n a5cf6c42-0c85-418f-af6c-3e4e5b1328f2",
            "title": "java_method"
        },
        {
            "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');\n 1  2",
            "title": "json_tuple"
        },
        {
            "location": "/#kurtosis",
            "text": "kurtosis(expr) - Returns the kurtosis value calculated from values of a group.",
            "title": "kurtosis"
        },
        {
            "location": "/#lag",
            "text": "lag(input[, offset[, default]]) - Returns the value of  input  at the  offset th row\nbefore the current row in the window. The default value of  offset  is 1 and the default\nvalue of  default  is null. If the value of  input  at the  offset th row is null,\nnull is returned. If there is no such offset row (e.g., when the offset is 1, the first\nrow of the window does not have any previous row),  default  is returned.",
            "title": "lag"
        },
        {
            "location": "/#last",
            "text": "last(expr[, isIgnoreNull]) - Returns the last value of  expr  for a group of rows.\nIf  isIgnoreNull  is true, returns only non-null values.",
            "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');\n 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.\nIf  isIgnoreNull  is true, returns only non-null values.",
            "title": "last_value"
        },
        {
            "location": "/#lcase",
            "text": "lcase(str) - Returns  str  with all characters changed to lowercase.  Examples:  > SELECT lcase('SparkSql');\n sparksql  Since:  1.0.1",
            "title": "lcase"
        },
        {
            "location": "/#lead",
            "text": "lead(input[, offset[, default]]) - Returns the value of  input  at the  offset th row\nafter the current row in the window. The default value of  offset  is 1 and the default\nvalue of  default  is null. If the value of  input  at the  offset th row is null,\nnull is returned. If there is no such an offset row (e.g., when the offset is 1, the last\nrow of the window does not have any subsequent row),  default  is returned.",
            "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);\n 2",
            "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);\n 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 ');\n 10\n> SELECT CHAR_LENGTH('Spark SQL ');\n 10\n> SELECT CHARACTER_LENGTH('Spark SQL ');\n 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');\n 3  Since:  1.5.0",
            "title": "levenshtein"
        },
        {
            "location": "/#like",
            "text": "str like pattern - Returns true if str matches pattern, 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\n    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\nexpressions)  The escape character is '\\'. If an escape character precedes a special symbol or another\nescape character, the following character is matched literally. It is invalid to escape\nany other character.  Since Spark 2.0, string literals are unescaped in our SQL parser. For example, in order\nto match \"\\abc\", the pattern should be \"\\abc\".  When SQL config 'spark.sql.parser.escapedStringLiterals' is enabled, it fallbacks\nto Spark 1.6 behavior regarding string literal parsing. For example, if the config is\nenabled, the pattern to match \"\\abc\" should be \"\\abc\".    Examples:  > SELECT '%SystemDrive%\\Users\\John' like '\\%SystemDrive\\%\\\\Users%'\ntrue  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);\n 0.0",
            "title": "ln"
        },
        {
            "location": "/#locate",
            "text": "locate(substr, str[, pos]) - Returns the position of the first occurrence of  substr  in  str  after position  pos .\nThe given  pos  and return value are 1-based.  Examples:  > SELECT locate('bar', 'foobarbar');\n 4\n> SELECT locate('bar', 'foobarbar', 5);\n 7\n> SELECT POSITION('bar' IN 'foobarbar');\n 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);\n 2.0",
            "title": "log"
        },
        {
            "location": "/#log10",
            "text": "log10(expr) - Returns the logarithm of  expr  with base 10.  Examples:  > SELECT log10(10);\n 1.0",
            "title": "log10"
        },
        {
            "location": "/#log1p",
            "text": "log1p(expr) - Returns log(1 +  expr ).  Examples:  > SELECT log1p(0);\n 0.0",
            "title": "log1p"
        },
        {
            "location": "/#log2",
            "text": "log2(expr) - Returns the logarithm of  expr  with base 2.  Examples:  > SELECT log2(2);\n 1.0",
            "title": "log2"
        },
        {
            "location": "/#lower",
            "text": "lower(str) - Returns  str  with all characters changed to lowercase.  Examples:  > SELECT lower('SparkSql');\n 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 .\nIf  str  is longer than  len , the return value is shortened to  len  characters.  Examples:  > SELECT lpad('hi', 5, '??');\n ???hi\n> SELECT lpad('hi', 1, '??');\n h  Since:  1.5.0",
            "title": "lpad"
        },
        {
            "location": "/#ltrim",
            "text": "ltrim(str) - Removes the leading space characters from  str .  ltrim(trimStr, str) - Removes the leading string contains the characters from the trim string  Arguments:   str - a string expression  trimStr - the trim string characters to trim, the default value is a single space   Examples:  > SELECT ltrim('    SparkSQL   ');\n SparkSQL\n> SELECT ltrim('Sp', 'SSparkSQLS');\n arkSQLS  Since:  1.5.0",
            "title": "ltrim"
        },
        {
            "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');\n {1.0:\"2\",3.0:\"4\"}",
            "title": "map"
        },
        {
            "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'));\n [1,2]",
            "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'));\n [\"a\",\"b\"]",
            "title": "map_values"
        },
        {
            "location": "/#max",
            "text": "max(expr) - Returns the maximum value of  expr .",
            "title": "max"
        },
        {
            "location": "/#md5",
            "text": "md5(expr) - Returns an MD5 128-bit checksum as a hex string of  expr .  Examples:  > SELECT md5('Spark');\n 8cde774d6f7333752ed72cacddb05126",
            "title": "md5"
        },
        {
            "location": "/#mean",
            "text": "mean(expr) - Returns the mean calculated from values of a group.",
            "title": "mean"
        },
        {
            "location": "/#min",
            "text": "min(expr) - Returns the minimum value of  expr .",
            "title": "min"
        },
        {
            "location": "/#minute",
            "text": "minute(timestamp) - Returns the minute component of the string/timestamp.  Examples:  > SELECT minute('2009-07-30 12:58:59');\n 58  Since:  1.5.0",
            "title": "minute"
        },
        {
            "location": "/#mod",
            "text": "expr1 mod expr2 - Returns the remainder after  expr1 / expr2 .  Examples:  > SELECT 2 mod 1.8;\n 0.2\n> SELECT MOD(2, 1.8);\n 0.2",
            "title": "mod"
        },
        {
            "location": "/#monotonically_increasing_id",
            "text": "monotonically_increasing_id() - Returns monotonically increasing 64-bit integers. The generated ID is guaranteed\nto be monotonically increasing and unique, but not consecutive. The current implementation\nputs the partition ID in the upper 31 bits, and the lower 33 bits represent the record number\nwithin each partition. The assumption is that the data frame has less than 1 billion\npartitions, and each partition has less than 8 billion records.",
            "title": "monotonically_increasing_id"
        },
        {
            "location": "/#month",
            "text": "month(date) - Returns the month component of the date/timestamp.  Examples:  > SELECT month('2016-07-30');\n 7  Since:  1.5.0",
            "title": "month"
        },
        {
            "location": "/#months_between",
            "text": "months_between(timestamp1, timestamp2) - Returns number of months between  timestamp1  and  timestamp2 .  Examples:  > SELECT months_between('1997-02-28 10:30:00', '1996-10-30');\n 3.94959677  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);\n {\"a\":1,\"b\":2,\"c\":3}",
            "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);\n 123.0  Since:  1.5.0",
            "title": "nanvl"
        },
        {
            "location": "/#negative",
            "text": "negative(expr) - Returns the negated value of  expr .  Examples:  > SELECT negative(1);\n -1",
            "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');\n 2015-01-20  Since:  1.5.0",
            "title": "next_day"
        },
        {
            "location": "/#not",
            "text": "not expr - Logical not.",
            "title": "not"
        },
        {
            "location": "/#now",
            "text": "now() - Returns the current timestamp at the start of query evaluation.  Since:  1.5.0",
            "title": "now"
        },
        {
            "location": "/#ntile",
            "text": "ntile(n) - Divides the rows for each window partition into  n  buckets ranging\nfrom 1 to at most  n .",
            "title": "ntile"
        },
        {
            "location": "/#nullif",
            "text": "nullif(expr1, expr2) - Returns null if  expr1  equals to  expr2 , or  expr1  otherwise.  Examples:  > SELECT nullif(2, 2);\n 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'));\n [\"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);\n 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');\n 9  Since:  2.3.0",
            "title": "octet_length"
        },
        {
            "location": "/#or",
            "text": "expr1 or expr2 - Logical OR.",
            "title": "or"
        },
        {
            "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')\n spark.apache.org\n> SELECT parse_url('http://spark.apache.org/path?query=1', 'QUERY')\n query=1\n> SELECT parse_url('http://spark.apache.org/path?query=1', 'QUERY', 'query')\n 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.",
            "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\nvalue of frequency should be positive integral  percentile(col, array(percentage1 [, percentage2]...) [, frequency]) - Returns the exact\npercentile value array of numeric column  col  at the given percentage(s). Each value\nof the percentage array must be between 0.0 and 1.0. The value of frequency should be\npositive integral",
            "title": "percentile"
        },
        {
            "location": "/#percentile_approx",
            "text": "percentile_approx(col, percentage [, accuracy]) - Returns the approximate percentile value of numeric\ncolumn  col  at the given percentage. The value of percentage must be between 0.0\nand 1.0. The  accuracy  parameter (default: 10000) is a positive numeric literal which\ncontrols approximation accuracy at the cost of memory. Higher value of  accuracy  yields\nbetter accuracy,  1.0/accuracy  is the relative error of the approximation.\nWhen  percentage  is an array, each value of the percentage array must be between 0.0 and 1.0.\nIn this case, returns the approximate percentile array of column  col  at the given\npercentage array.  Examples:  > SELECT percentile_approx(10.0, array(0.5, 0.4, 0.1), 100);\n [10.0,10.0,10.0]\n> SELECT percentile_approx(10.0, 0.5, 100);\n 10.0",
            "title": "percentile_approx"
        },
        {
            "location": "/#pi",
            "text": "pi() - Returns pi.  Examples:  > SELECT pi();\n 3.141592653589793",
            "title": "pi"
        },
        {
            "location": "/#pmod",
            "text": "pmod(expr1, expr2) - Returns the positive value of  expr1  mod  expr2 .  Examples:  > SELECT pmod(10, 3);\n 1\n> SELECT pmod(-10, 3);\n 2",
            "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.  Examples:  > SELECT posexplode(array(10,20));\n 0  10\n 1  20",
            "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.  Examples:  > SELECT posexplode_outer(array(10,20));\n 0  10\n 1  20",
            "title": "posexplode_outer"
        },
        {
            "location": "/#position",
            "text": "position(substr, str[, pos]) - Returns the position of the first occurrence of  substr  in  str  after position  pos .\nThe given  pos  and return value are 1-based.  Examples:  > SELECT position('bar', 'foobarbar');\n 4\n> SELECT position('bar', 'foobarbar', 5);\n 7\n> SELECT POSITION('bar' IN 'foobarbar');\n 4  Since:  1.5.0",
            "title": "position"
        },
        {
            "location": "/#positive",
            "text": "positive(expr) - Returns the value of  expr .",
            "title": "positive"
        },
        {
            "location": "/#pow",
            "text": "pow(expr1, expr2) - Raises  expr1  to the power of  expr2 .  Examples:  > SELECT pow(2, 3);\n 8.0",
            "title": "pow"
        },
        {
            "location": "/#power",
            "text": "power(expr1, expr2) - Raises  expr1  to the power of  expr2 .  Examples:  > SELECT power(2, 3);\n 8.0",
            "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\");\n 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');\n 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);\n 3.141592653589793",
            "title": "radians"
        },
        {
            "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();\n 0.9629742951434543\n> SELECT rand(0);\n 0.8446490682263027\n> SELECT rand(null);\n 0.8446490682263027  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();\n -0.3254147983080288\n> SELECT randn(0);\n 1.1164209726833079\n> SELECT randn(null);\n 1.1164209726833079  Since:  1.5.0",
            "title": "randn"
        },
        {
            "location": "/#rank",
            "text": "rank() - Computes the rank of a value in a group of values. The result is one plus the number\nof rows preceding or equal to the current row in the ordering of the partition. The values\nwill produce gaps in the sequence.",
            "title": "rank"
        },
        {
            "location": "/#reflect",
            "text": "reflect(class, method[, arg1[, arg2 ..]]) - Calls a method with reflection.  Examples:  > SELECT reflect('java.util.UUID', 'randomUUID');\n c33fb387-8500-4bfa-81d2-6e0e3e930df2\n> SELECT reflect('java.util.UUID', 'fromString', 'a5cf6c42-0c85-418f-af6c-3e4e5b1328f2');\n a5cf6c42-0c85-418f-af6c-3e4e5b1328f2",
            "title": "reflect"
        },
        {
            "location": "/#regexp_extract",
            "text": "regexp_extract(str, regexp[, idx]) - Extracts a group that matches  regexp .  Examples:  > SELECT regexp_extract('100-200', '(\\d+)-(\\d+)', 1);\n 100  Since:  1.5.0",
            "title": "regexp_extract"
        },
        {
            "location": "/#regexp_replace",
            "text": "regexp_replace(str, regexp, rep) - Replaces all substrings of  str  that match  regexp  with  rep .  Examples:  > SELECT regexp_replace('100-200', '(\\d+)', 'num');\n 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);\n 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\n    the string that is removed from  str .   Examples:  > SELECT replace('ABCabc', 'abc', 'DEF');\n ABCDEF  Since:  2.3.0",
            "title": "replace"
        },
        {
            "location": "/#reverse",
            "text": "reverse(str) - Returns the reversed given string.  Examples:  > SELECT reverse('Spark SQL');\n LQS krapS",
            "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);\n 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);\n 12.0",
            "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 pattern string should be a Java regular expression.  Since Spark 2.0, string literals (including regex patterns) are unescaped in our SQL\nparser. For example, to match \"\\abc\", a regular expression for  regexp  can be\n\"^\\abc$\".  There is a SQL config 'spark.sql.parser.escapedStringLiterals' that can be used to\nfallback to the Spark 1.6 behavior regarding string literal parsing. For example,\nif the config is enabled, the  regexp  that can match \"\\abc\" is \"^\\abc$\".    Examples:  When spark.sql.parser.escapedStringLiterals is disabled (default).\n> SELECT '%SystemDrive%\\Users\\John' rlike '%SystemDrive%\\\\Users.*'\ntrue\n\nWhen spark.sql.parser.escapedStringLiterals is enabled.\n> SELECT '%SystemDrive%\\Users\\John' rlike '%SystemDrive%\\Users.*'\ntrue  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\nso 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);\n  NULL    NULL    2\n  Alice   2       1\n  Bob     5       1\n  Bob     NULL    1\n  Alice   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);\n 3.0",
            "title": "round"
        },
        {
            "location": "/#row_number",
            "text": "row_number() - Assigns a unique, sequential number to each row, starting with one,\naccording to the ordering of rows within the window partition.",
            "title": "row_number"
        },
        {
            "location": "/#rpad",
            "text": "rpad(str, len, pad) - Returns  str , right-padded with  pad  to a length of  len .\nIf  str  is longer than  len , the return value is shortened to  len  characters.  Examples:  > SELECT rpad('hi', 5, '??');\n hi???\n> SELECT rpad('hi', 1, '??');\n h  Since:  1.5.0",
            "title": "rpad"
        },
        {
            "location": "/#rtrim",
            "text": "rtrim(str) - Removes the trailing space characters from  str .  rtrim(trimStr, str) - Removes the trailing string which contains the characters from the trim string from the  str  Arguments:   str - a string expression  trimStr - the trim string characters to trim, the default value is a single space   Examples:  > SELECT rtrim('    SparkSQL   ');\n SparkSQL\n> SELECT rtrim('LQSa', 'SSparkSQLS');\n SSpark  Since:  1.5.0",
            "title": "rtrim"
        },
        {
            "location": "/#second",
            "text": "second(timestamp) - Returns the second component of the string/timestamp.  Examples:  > SELECT second('2009-07-30 12:58:59');\n 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.');\n [[\"Hi\",\"there\"],[\"Good\",\"morning\"]]  Since:  2.0.0",
            "title": "sentences"
        },
        {
            "location": "/#sha",
            "text": "sha(expr) - Returns a sha1 hash value as a hex string of the  expr .  Examples:  > SELECT sha('Spark');\n 85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c",
            "title": "sha"
        },
        {
            "location": "/#sha1",
            "text": "sha1(expr) - Returns a sha1 hash value as a hex string of the  expr .  Examples:  > SELECT sha1('Spark');\n 85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c",
            "title": "sha1"
        },
        {
            "location": "/#sha2",
            "text": "sha2(expr, bitLength) - Returns a checksum of SHA-2 family as a hex string of  expr .\nSHA-224, SHA-256, SHA-384, and SHA-512 are supported. Bit length of 0 is equivalent to 256.  Examples:  > SELECT sha2('Spark', 256);\n 529bc3b07127ecb7e53a4dcf1991d9152c24537d919178022b2c42657f79a26b",
            "title": "sha2"
        },
        {
            "location": "/#shiftleft",
            "text": "shiftleft(base, expr) - Bitwise left shift.  Examples:  > SELECT shiftleft(2, 1);\n 4",
            "title": "shiftleft"
        },
        {
            "location": "/#shiftright",
            "text": "shiftright(base, expr) - Bitwise (signed) right shift.  Examples:  > SELECT shiftright(4, 1);\n 2",
            "title": "shiftright"
        },
        {
            "location": "/#shiftrightunsigned",
            "text": "shiftrightunsigned(base, expr) - Bitwise unsigned right shift.  Examples:  > SELECT shiftrightunsigned(4, 1);\n 2",
            "title": "shiftrightunsigned"
        },
        {
            "location": "/#sign",
            "text": "sign(expr) - Returns -1.0, 0.0 or 1.0 as  expr  is negative, 0 or positive.  Examples:  > SELECT sign(40);\n 1.0",
            "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);\n 1.0",
            "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);\n 0.0",
            "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);\n 0.0",
            "title": "sinh"
        },
        {
            "location": "/#size",
            "text": "size(expr) - Returns the size of an array or a map. Returns -1 if null.  Examples:  > SELECT size(array('b', 'd', 'c', 'a'));\n 4",
            "title": "size"
        },
        {
            "location": "/#skewness",
            "text": "skewness(expr) - Returns the skewness value calculated from values of a group.",
            "title": "skewness"
        },
        {
            "location": "/#smallint",
            "text": "smallint(expr) - Casts the value  expr  to the target data type  smallint .",
            "title": "smallint"
        },
        {
            "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.  Examples:  > SELECT sort_array(array('b', 'd', 'c', 'a'), true);\n [\"a\",\"b\",\"c\",\"d\"]",
            "title": "sort_array"
        },
        {
            "location": "/#soundex",
            "text": "soundex(str) - Returns Soundex code of the string.  Examples:  > SELECT soundex('Miller');\n 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');\n   1  Since:  1.5.0",
            "title": "space"
        },
        {
            "location": "/#spark_partition_id",
            "text": "spark_partition_id() - Returns the current partition id.",
            "title": "spark_partition_id"
        },
        {
            "location": "/#split",
            "text": "split(str, regex) - Splits  str  around occurrences that match  regex .  Examples:  > SELECT split('oneAtwoBthreeC', '[ABC]');\n [\"one\",\"two\",\"three\",\"\"]  Since:  1.5.0",
            "title": "split"
        },
        {
            "location": "/#sqrt",
            "text": "sqrt(expr) - Returns the square root of  expr .  Examples:  > SELECT sqrt(4);\n 2.0",
            "title": "sqrt"
        },
        {
            "location": "/#stack",
            "text": "stack(n, expr1, ..., exprk) - Separates  expr1 , ...,  exprk  into  n  rows.  Examples:  > SELECT stack(2, 1, 2, 3);\n 1  2\n 3  NULL",
            "title": "stack"
        },
        {
            "location": "/#std",
            "text": "std(expr) - Returns the sample standard deviation calculated from values of a group.",
            "title": "std"
        },
        {
            "location": "/#stddev",
            "text": "stddev(expr) - Returns the sample standard deviation calculated from values of a group.",
            "title": "stddev"
        },
        {
            "location": "/#stddev_pop",
            "text": "stddev_pop(expr) - Returns the population standard deviation calculated from values of a group.",
            "title": "stddev_pop"
        },
        {
            "location": "/#stddev_samp",
            "text": "stddev_samp(expr) - Returns the sample standard deviation calculated from values of a group.",
            "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 .  Examples:  > SELECT str_to_map('a:1,b:2,c:3', ',', ':');\n map(\"a\":\"1\",\"b\":\"2\",\"c\":\"3\")\n> SELECT str_to_map('a');\n map(\"a\":null)",
            "title": "str_to_map"
        },
        {
            "location": "/#string",
            "text": "string(expr) - Casts the value  expr  to the target data type  string .",
            "title": "string"
        },
        {
            "location": "/#struct",
            "text": "struct(col1, col2, col3, ...) - Creates a struct with the given field values.",
            "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 .  Examples:  > SELECT substr('Spark SQL', 5);\n k SQL\n> SELECT substr('Spark SQL', -3);\n SQL\n> SELECT substr('Spark SQL', 5, 1);\n 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 .  Examples:  > SELECT substring('Spark SQL', 5);\n k SQL\n> SELECT substring('Spark SQL', -3);\n SQL\n> SELECT substring('Spark SQL', 5, 1);\n 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 .\nIf  count  is positive, everything to the left of the final delimiter (counting from the\nleft) is returned. If  count  is negative, everything to the right of the final delimiter\n(counting from the right) is returned. The function substring_index performs a case-sensitive match\nwhen searching for  delim .  Examples:  > SELECT substring_index('www.apache.org', '.', 2);\n www.apache  Since:  1.5.0",
            "title": "substring_index"
        },
        {
            "location": "/#sum",
            "text": "sum(expr) - Returns the sum calculated from values of a group.",
            "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);\n 0.0",
            "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);\n 0.0",
            "title": "tanh"
        },
        {
            "location": "/#timestamp",
            "text": "timestamp(expr) - Casts the value  expr  to the target data type  timestamp .",
            "title": "timestamp"
        },
        {
            "location": "/#tinyint",
            "text": "tinyint(expr) - Casts the value  expr  to the target data type  tinyint .",
            "title": "tinyint"
        },
        {
            "location": "/#to_date",
            "text": "to_date(date_str[, fmt]) - Parses the  date_str  expression with the  fmt  expression to\na date. Returns null with invalid input. By default, it follows casting rules to a date if\nthe  fmt  is omitted.  Examples:  > SELECT to_date('2009-07-30 04:17:52');\n 2009-07-30\n> SELECT to_date('2016-12-31', 'yyyy-MM-dd');\n 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));\n {\"a\":1,\"b\":2}\n> SELECT to_json(named_struct('time', to_timestamp('2015-08-26', 'yyyy-MM-dd')), map('timestampFormat', 'dd/MM/yyyy'));\n {\"time\":\"26/08/2015\"}\n> SELECT to_json(array(named_struct('a', 1, 'b', 2)));\n [{\"a\":1,\"b\":2}]\n> SELECT to_json(map('a', named_struct('b', 1)));\n {\"a\":{\"b\":1}}\n> SELECT to_json(map(named_struct('a', 1),named_struct('b', 2)));\n {\"[1]\":{\"b\":2}}\n> SELECT to_json(map('a', 1));\n {\"a\":1}\n> SELECT to_json(array((map('a', 1))));\n [{\"a\":1}]  Since:  2.2.0",
            "title": "to_json"
        },
        {
            "location": "/#to_timestamp",
            "text": "to_timestamp(timestamp[, fmt]) - Parses the  timestamp  expression with the  fmt  expression to\na timestamp. Returns null with invalid input. By default, it follows casting rules to\na timestamp if the  fmt  is omitted.  Examples:  > SELECT to_timestamp('2016-12-31 00:12:00');\n 2016-12-31 00:12:00\n> SELECT to_timestamp('2016-12-31', 'yyyy-MM-dd');\n 2016-12-31 00:00:00  Since:  2.2.0",
            "title": "to_timestamp"
        },
        {
            "location": "/#to_unix_timestamp",
            "text": "to_unix_timestamp(expr[, pattern]) - Returns the UNIX timestamp of the given time.  Examples:  > SELECT to_unix_timestamp('2016-04-08', 'yyyy-MM-dd');\n 1460041200  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');\n 2016-08-30 15:00:00  Since:  1.5.0",
            "title": "to_utc_timestamp"
        },
        {
            "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');\n A1B2C3  Since:  1.5.0",
            "title": "translate"
        },
        {
            "location": "/#trim",
            "text": "trim(str) - Removes the leading and trailing space 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\n    the string  LEADING, FROM - these are keywords to specify trimming string characters from the left\n    end of the string  TRAILING, FROM - these are keywords to specify trimming string characters from the right\n    end of the string   Examples:  > SELECT trim('    SparkSQL   ');\n SparkSQL\n> SELECT trim('SL', 'SSparkSQLS');\n parkSQ\n> SELECT trim(BOTH 'SL' FROM 'SSparkSQLS');\n parkSQ\n> SELECT trim(LEADING 'SL' FROM 'SSparkSQLS');\n parkSQLS\n> SELECT trim(TRAILING 'SL' FROM 'SSparkSQLS');\n 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 . fmt  should be one of [\"year\", \"yyyy\", \"yy\", \"mon\", \"month\", \"mm\"]  Examples:  > SELECT trunc('2009-02-12', 'MM');\n 2009-02-01\n> SELECT trunc('2015-10-27', 'YEAR');\n 2015-01-01  Since:  1.5.0",
            "title": "trunc"
        },
        {
            "location": "/#ucase",
            "text": "ucase(str) - Returns  str  with all characters changed to uppercase.  Examples:  > SELECT ucase('SparkSql');\n 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');\n 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');\n Spark SQL",
            "title": "unhex"
        },
        {
            "location": "/#unix_timestamp",
            "text": "unix_timestamp([expr[, pattern]]) - Returns the UNIX timestamp of current or specified time.  Examples:  > SELECT unix_timestamp();\n 1476884637\n> SELECT unix_timestamp('2016-04-08', 'yyyy-MM-dd');\n 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');\n 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();\n 46707d92-02f4-4817-8116-a4c3b23e6266",
            "title": "uuid"
        },
        {
            "location": "/#var_pop",
            "text": "var_pop(expr) - Returns the population variance calculated from values of a group.",
            "title": "var_pop"
        },
        {
            "location": "/#var_samp",
            "text": "var_samp(expr) - Returns the sample variance calculated from values of a group.",
            "title": "var_samp"
        },
        {
            "location": "/#variance",
            "text": "variance(expr) - Returns the sample variance calculated from values of a group.",
            "title": "variance"
        },
        {
            "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');\n 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\n    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;\n 1\n> SELECT CASE WHEN 1 < 0 THEN 1 WHEN 2 > 0 THEN 2.0 ELSE 1.2 END;\n 2\n> SELECT CASE WHEN 1 < 0 THEN 1 WHEN 2 < 0 THEN 2.0 END;\n NULL",
            "title": "when"
        },
        {
            "location": "/#window",
            "text": "",
            "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()');\n ['b1','b2','b3']",
            "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');\n true",
            "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)');\n 3.0",
            "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)');\n 3.0",
            "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)');\n 3",
            "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)');\n 3",
            "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)');\n 3.0",
            "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)');\n 3",
            "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');\n cc",
            "title": "xpath_string"
        },
        {
            "location": "/#year",
            "text": "year(date) - Returns the year component of the date/timestamp.  Examples:  > SELECT year('2016-07-30');\n 2016  Since:  1.5.0",
            "title": "year"
        },
        {
            "location": "/#_15",
            "text": "expr1 | expr2 - Returns the result of bitwise OR of  expr1  and  expr2 .  Examples:  > SELECT 3 | 5;\n 7",
            "title": "|"
        },
        {
            "location": "/#_16",
            "text": "~ expr - Returns the result of bitwise NOT of  expr .  Examples:  > SELECT ~ 0;\n -1",
            "title": "~"
        }
    ]
}