array_split

array_split

description

Syntax

  1. ARRAY<ARRAY<T>> array_split(ARRAY<T> arg, Array<Boolean> cond)
  2. ARRAY<ARRAY<T>> array_split(lambda, ARRAY<T0> arg0...)
  1. 传入两个长度相等的 ARRAY 且第二个为 Array<Boolean>，则按照 cond 中为 true 的位置左侧作为分割点，分割 arg 。
  2. 高阶函数，传入一个 lambda 表达式和至少一个 ARRAY arg0，则按照 lambda 表达式运算得到的 Array<Boolean> 结果，其中为 true 的位置左侧作为分割点，分割 arg0 。

example

  1. mysql> select array_split([1,2,3,4,5], [1,0,1,0,0]);
  2. +-----------------------------------------------------------------------+
  3. | array_split([1, 2, 3, 4, 5], cast([1, 0, 1, 0, 0] as ARRAY<BOOLEAN>)) |
  4. +-----------------------------------------------------------------------+
  5. | [[1, 2], [3, 4, 5]]                                                   |
  6. +-----------------------------------------------------------------------+
  7. 1 row in set (0.09 sec)
  9. mysql> select array_split((x,y)->y, [1,2,3,4,5], [1,0,0,0,0]);
  10. +----------------------------------------------------------------------------------------------------------------+
  11. | array_split([1, 2, 3, 4, 5], cast(array_map((x, y) -> y, [1, 2, 3, 4, 5], [1, 0, 0, 0, 0]) as ARRAY<BOOLEAN>)) |
  12. +----------------------------------------------------------------------------------------------------------------+
  13. | [[1, 2, 3, 4, 5]]                                                                                              |
  14. +----------------------------------------------------------------------------------------------------------------+
  15. 1 row in set (0.13 sec)
  17. mysql> select array_split((x,y)->(y+1), ['a', 'b', 'c', 'd'], [-1, -1, 0, -1]);
  18. +--------------------------------------------------------------------------------------------------------------------------------+
  19. | array_split(['a', 'b', 'c', 'd'], cast(array_map((x, y) -> (y + 1), ['a', 'b', 'c', 'd'], [-1, -1, 0, -1]) as ARRAY<BOOLEAN>)) |
  20. +--------------------------------------------------------------------------------------------------------------------------------+
  21. | [["a", "b"], ["c", "d"]]                                                                                                       |
  22. +--------------------------------------------------------------------------------------------------------------------------------+
  23. 1 row in set (0.12 sec)
  25. mysql> select array_split(x->(year(x)>2013),["2020-12-12", "2013-12-12", "2015-12-12", null]);
  26. +-------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  27. | array_split(['2020-12-12', '2013-12-12', '2015-12-12', NULL], array_map(x -> (year(cast(x as DATEV2)) > 2013), ['2020-12-12', '2013-12-12', '2015-12-12', NULL])) |
  28. +-------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  29. | [["2020-12-12", "2013-12-12"], ["2015-12-12"], [null]]                                                                                                            |
  30. +-------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  31. 1 row in set (0.14 sec)

keywords

ARRAY, SPLIT, ARRAY_SPLIT