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MDEV-42239 JSON_EQUALS() with a NULL argument is accepted by WHERE / IF / CASE although its value is NULL - #6143
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mehul-raj5 wants to merge 1 commit into
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mehul-raj5 wants to merge 1 commit into
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…IF / CASE although its value is NULL Item::val_bool() must return FALSE when the value is NULL, and report NULL through null_value. Item_func_json_equals::val_bool() set null_value but returned 1 when an argument was NULL, and on the two out-of-memory paths. The select list checks null_value and showed NULL, but WHERE, HAVING, IF and CASE use only the return value and treated the NULL as TRUE. Return 0 on these paths, as the function already does for invalid JSON, and as the other JSON boolean functions do.
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Description
Item::val_bool()must return FALSE when the value is NULL, and report NULL throughnull_value.Item_func_json_equals::val_bool()setnull_valuebut returned 1 when an argument was NULL, and on the two out-of-memory paths. The select list checksnull_valueand showed NULL, but WHERE, HAVING, IF and CASE use only the return value and treated the NULL as TRUE.This patch returns 0 on these paths, as the function already does for invalid JSON, and as the other JSON boolean functions do (
JSON_VALID,JSON_EXISTS,JSON_CONTAINS,JSON_CONTAINS_PATH,JSON_OVERLAPS).Before and after, with
t1(id, j)holding rows 1, 2, 3:SELECT JSON_EQUALS(NULL, j)WHERE JSON_EQUALS(NULL, j)WHERE JSON_EQUALS(NULL, j) IS NULLIF(JSON_EQUALS(NULL, j), 'T', 'F')SELECT 'row' WHERE JSON_EQUALS(NULL, '{}')