spark2.4.0内置函数官网连接:http://spark.apache.org/docs/latest/api/sql/index.html;
内置函数大致有一下分类，具体详见官网连接：
聚合函数:
approxCountDistinct, avg, count, countDistinct, first, last, max, mean, min, sum, sumDistinct
集合函数:
array_contains, explode, size, sort_array
日期时间转换
unix_timestamp, from_unixtime, to_date, quarter, day, dayofyear, weekofyear, from_utc_timestamp, to_utc_timestamp
从日期时间中提取字段
year, month, dayofmonth, hour, minute, second
日期/时间计算
datediff, date_add, date_sub, add_months, last_day, next_day, months_between
获取当前时间等
current_date, current_timestamp, trunc, date_format
数学函数：
abs, acros, asin, atan, atan2, bin, cbrt, ceil, conv, cos, sosh, exp, expm1, factorial, floor, hex, hypot, log, log10, log1p, log2, pmod, pow, rint, round, shiftLeft, shiftRight, shiftRightUnsigned, signum, sin, sinh, sqrt, tan, tanh, toDegrees, toRadians, unhex
混合函数:
array, bitwiseNOT, callUDF, coalesce, crc32, greatest, if, inputFileName, isNaN, isnotnull, isnull, least, lit, md5, monotonicallyIncreasingId, nanvl, negate, not, rand, randn, sha, sha1, sparkPartitionId, struct, when
字符串函数:
ascii, base64, concat, concat_ws, decode, encode, format_number, format_string, get_json_object, initcap, instr, length, levenshtein, locate, lower, lpad, ltrim, printf, regexp_extract, regexp_replace, repeat, reverse, rpad, rtrim, soundex, space, split, substring, substring_index, translate, trim, unb
窗口函数:
cumeDist, denseRank, lag, lead, ntile, percentRank, rank, rowNumber
ase64, upper
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