array_compact

SinceVersion 1.2.0

array_compact

description

Removes consecutive duplicate elements from an array. The order of result values is determined by the order in the source array.

Syntax

Array<T> array_compact(arr)

Arguments

arr — The array to inspect.

Returned value

The array without continuous duplicate.

Type: Array.

notice

Only supported in vectorized engine

example

  1. select array_compact([1, 2, 3, 3, null, null, 4, 4]);
  3. +----------------------------------------------------+
  4. | array_compact(ARRAY(1, 2, 3, 3, NULL, NULL, 4, 4)) |
  5. +----------------------------------------------------+
  6. | [1, 2, 3, NULL, 4]                                 |
  7. +----------------------------------------------------+
  9. select array_compact(['aaa','aaa','bbb','ccc','ccccc',null, null,'dddd']);
  11. +-------------------------------------------------------------------------------+
  12. | array_compact(ARRAY('aaa', 'aaa', 'bbb', 'ccc', 'ccccc', NULL, NULL, 'dddd')) |
  13. +-------------------------------------------------------------------------------+
  14. | ['aaa', 'bbb', 'ccc', 'ccccc', NULL, 'dddd']                                  |
  15. +-------------------------------------------------------------------------------+
  17. select array_compact(['2015-03-13','2015-03-13']);
  19. +--------------------------------------------------+
  20. | array_compact(ARRAY('2015-03-13', '2015-03-13')) |
  21. +--------------------------------------------------+
  22. | ['2015-03-13']                                   |
  23. +--------------------------------------------------+

keywords

ARRAY,COMPACT,ARRAY_COMPACT