FLATTEN
Converts an array of arrays into a flat array. This means for every element that is an array, this function extracts its elements into the new array. The resulting flattened array contains all the elements from all source arrays.
The function:
- Applies to any depth of nested arrays.
- Does not change arrays that are already flat.
Syntax
FLATTEN(<array>)
Parameters
| Parameter | Description | Supported input types |
|---|---|---|
<array> | The array of arrays to be flattened | Any ARRAY of ARRAY types |
Return Type
ARRAY of the same type as the input array
Example
The following example flattens multiple arrays of level IDs:
SELECT
FLATTEN([ [ [ 1, 2 ] ], [ [ 2, 3 ], [ 3, 4 ] ] ])
Returns: [1, 2, 2, 3, 3, 4]