MDEV-38757 Fix EXCHANGE PARTITION with generated columns containing and/or #4623
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…ND/OR conditions EXCHANGE PARTITION fails with ERROR 1736 (Tables have different definitions) when tables contain generated columns with AND/OR conditions, even when the expressions are logically equivalent. This occurs because when expressions are re-parsed (e.g., via CREATE TABLE ... LIKE), the order of arguments in AND/OR conditions may change, but the comparison was order-sensitive. The Item_cond::eq() method was implemented to perform set-based comparison for commutative AND/OR operations. The set-based comparison algorithm ensures that two Item_cond expressions are considered equal if they contain the same set of equivalent arguments, regardless of order. Added comprehensive test case covering: - Generated columns with OR conditions - Generated columns with AND conditions - Multiple generated columns with different AND/OR combinations - Nested AND/OR conditions The fix allows EXCHANGE PARTITION to succeed when expressions are logically equivalent but have different argument ordering, which is correct behavior since AND/OR operations are commutative.
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EXCHANGE PARTITION fails with ERROR 1736 (Tables have different definitions) when tables contain generated columns with AND/OR conditions, even when the expressions are logically equivalent. This occurs because when expressions are re-parsed (e.g., via CREATE TABLE ... LIKE), the order of arguments in AND/OR conditions may change, but the comparison was order-sensitive.
The Item_cond::eq() method was implemented to perform set-based comparison for commutative AND/OR operations. The set-based comparison algorithm ensures that two Item_cond expressions are considered equal if they contain the same set of equivalent arguments, regardless of order.
Added comprehensive test case covering:
The fix allows EXCHANGE PARTITION to succeed when expressions are logically equivalent but have different argument ordering, which is correct behavior since AND/OR operations are commutative.