array_compact
array_compact​
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​
select array_compact([1, 2, 3, 3, null, null, 4, 4]);
+----------------------------------------------------+
| array_compact(ARRAY(1, 2, 3, 3, NULL, NULL, 4, 4)) |
+----------------------------------------------------+
| [1, 2, 3, NULL, 4] |
+----------------------------------------------------+
select array_compact(['aaa','aaa','bbb','ccc','ccccc',null, null,'dddd']);
+-------------------------------------------------------------------------------+
| array_compact(ARRAY('aaa', 'aaa', 'bbb', 'ccc', 'ccccc', NULL, NULL, 'dddd')) |
+-------------------------------------------------------------------------------+
| ['aaa', 'bbb', 'ccc', 'ccccc', NULL, 'dddd'] |
+-------------------------------------------------------------------------------+
select array_compact(['2015-03-13','2015-03-13']);
+--------------------------------------------------+
| array_compact(ARRAY('2015-03-13', '2015-03-13')) |
+--------------------------------------------------+
| ['2015-03-13'] |
+--------------------------------------------------+
keywords​
ARRAY,COMPACT,ARRAY_COMPACT
