gen4 planner bugfix: issue when merging subqueries #13025
Merged
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Description
In PR #12197, a refactoring error resulted in a bug causing the generation of invalid query plans under specific conditions.
While merging a subquery with the outer query, predicates from the subquery were not copied properly. This led to a partial merge where certain expressions were treated as unmergeable, creating an inconsistency. Consequently, invalid query plans were produced, resulting in the following error:
query arguments missing for __sq1
This PR resolves the issue and includes a test to prevent similar problems from occurring in the future.
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