any_match

Description

Returns whether any elements of an array match the given predicate.

Returns true (1) if one or more elements match the predicate.
Returns false (0) if none of the elements matches (a special case is when the array is empty).
Returns NULL if the predicate returns NULL for one or more elements and false for all other elements.

Syntax

any_match(lambda_function, arr1, arr2...)

Returns whether any elements of arr1 match the given predicate in the lambda function.

Parameters

arr1: the array to match.
arrN: optional arrays used in the lambda function.
lambda_function: the lambda function used to match values.

Return value

Returns a BOOLEAN value.

Usage notes

The lambda function follows the usage notes in array_map(). It returns array\<bool>.
If the input array is null or the lambda function results in null, null is returned.
If arr1 is empty, false is returned.
To apply this function to MAP, rewrite any_match((k,v)->k>v,map) to any_match(map_values(transform_values((k,v)->k>v, map))). For example, select any_match(map_values(transform_values((k,v)->k>v, map{2:1}))); returns 1.

Examples

Check whether any element in x is less than the elements in y.

select any_match((x,y) -> x < y, [1,2,8], [4,5,6]);
+--------------------------------------------------+
| any_match((x, y) -> x < y, [1, 2, 8], [4, 5, 6]) |
+--------------------------------------------------+
|                                                1 |
+--------------------------------------------------+

select any_match((x,y) -> x < y, [11,12,8], [4,5,6]);
+----------------------------------------------------+
| any_match((x, y) -> x < y, [11, 12, 8], [4, 5, 6]) |
+----------------------------------------------------+
|                                                  0 |
+----------------------------------------------------+

select any_match((x,y) -> x < y, [11,12,null], [4,5,6]);
+-------------------------------------------------------+
| any_match((x, y) -> x < y, [11, 12, NULL], [4, 5, 6]) |
+-------------------------------------------------------+
|                                                  NULL |
+-------------------------------------------------------+

select any_match((x,y) -> x < y, [], []);
+------------------------------------+
| any_match((x, y) -> x < y, [], []) |
+------------------------------------+
|                                  0 |
+------------------------------------+

select any_match((x,y) -> x < y, null, [4,5,6]);
+---------------------------------------------+
| any_match((x, y) -> x < y, NULL, [4, 5, 6]) |
+---------------------------------------------+
|                                        NULL |
+---------------------------------------------+