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

1. 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