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default_array_search_null_handling

Values (default in bold)

TRUE, FALSE

Description

Specifies the null handling behavior for array search operations. When default_array_search_null_handling is TRUE, NULL values are treated as valid elements that can be searched within arrays. When default_array_search_null_handling is FALSE, NULL key searches return NULL, and if the array contains NULL values with no match found, the search returns NULL.

Examples

SET default_array_search_null_handling to TRUE;

-- ARRAY_CONTAINS: NULL search is allowed
SELECT ARRAY_CONTAINS(ARRAY('red', NULL, 'green'), NULL);
array_contains
----------------
 t
(1 row)

-- ARRAY_POSITION: Array can contain NULLs
SELECT ARRAY_POSITION(ARRAY('red', NULL, 'green'), 'blue');
 array_position 
----------------
             -1
(1 row)

SET default_array_search_null_handling to FALSE;

-- ARRAY_CONTAINS: NULL search is disabled
SELECT ARRAY_CONTAINS(ARRAY('red', 'green'), NULL);
array_contains
----------------
 
(1 row)

-- ARRAY_POSITION: Array contains NULL but no match is found
SELECT ARRAY_POSITION(ARRAY('red', NULL, 'green'), 'blue');
 array_position 
----------------
               
(1 row)