array_with_constant

array_with_constant array_repeat

description

Syntax

  1. ARRAY<T> array_with_constant(n, T)
  2. ARRAY<T> array_repeat(T, n)

返回一个数组，包含 n 个重复的 T 常量。array_repeat 与 array_with_constant 功能相同，用来兼容 hive 语法格式。

example

  1. mysql> select array_with_constant(2, "hello"), array_repeat("hello", 2);
  2. +---------------------------------+--------------------------+
  3. | array_with_constant(2, 'hello') | array_repeat('hello', 2) |
  4. +---------------------------------+--------------------------+
  5. | ['hello', 'hello']              | ['hello', 'hello']       |
  6. +---------------------------------+--------------------------+
  7. 1 row in set (0.04 sec)
  9. mysql> select array_with_constant(3, 12345), array_repeat(12345, 3);
  10. +-------------------------------+------------------------+
  11. | array_with_constant(3, 12345) | array_repeat(12345, 3) | 
  12. +-------------------------------+------------------------+
  13. | [12345, 12345, 12345]         | [12345, 12345, 12345]  |
  14. +-------------------------------+------------------------+
  15. 1 row in set (0.01 sec)
  17. mysql> select array_with_constant(3, null), array_repeat(null, 3);
  18. +------------------------------+-----------------------+
  19. | array_with_constant(3, NULL) | array_repeat(NULL, 3) |
  20. +------------------------------+-----------------------+
  21. | [NULL, NULL, NULL]           |  [NULL, NULL, NULL]   |
  22. +------------------------------+-----------------------+
  23. 1 row in set (0.01 sec)
  25. mysql> select array_with_constant(null, 3), array_repeat(3, null);
  26. +------------------------------+-----------------------+
  27. | array_with_constant(NULL, 3) | array_repeat(3, NULL) |
  28. +------------------------------+-----------------------+
  29. | []                           | []                    |
  30. +------------------------------+-----------------------+
  31. 1 row in set (0.01 sec)

keywords

ARRAY,WITH_CONSTANT,ARRAY_WITH_CONSTANT,ARRAY_REPEAT