ljq-dmr opened a new pull request, #6485:
URL: https://github.com/apache/hive/pull/6485
### What changes were proposed in this pull request?
lineage column Predicate baseCols
### Why are the changes needed?
The logic in ExprProcFactory#findSourceColumn resolves source columns from
TopOps by matching table and field aliases. If a match is found, it returns
the result directly. This implementation fails in scenarios involving multiple
subqueries with identical table aliases (e.g., in a UNION statement). Because
the search returns the first match it encounters, it may link to the wrong
source column from a different subquery branch, leading to incorrect lineage
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
mvn test -Pitests -pl itests/qtest -Dtest=TestMiniLlapLocalCliDriver
-Dqfile=lineage8.q
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