branch-2.1: [fix](function) JSON_EXTRACT_STRING should return NULL instead of the string 'null' when encountering a NULL value #51516 #51566
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… string 'null' when encountering a NULL value (#51516) ### What problem does this PR solve? Previously, when JSON_EXTRACT_STRING encountered a NULL input value or path, it returned the string "null" instead of a proper SQL NULL value. This behavior could lead to incorrect query results and confusion in downstream processing that expects NULL to be represented as an actual null value rather than a literal string. This commit adjusts the logic to ensure that JSON_EXTRACT_STRING returns NULL in such cases, aligning with SQL semantics and improving compatibility with systems that rely on strict null-handling behavior.
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Cherry-picked from #51516