[spark] Fix merge into update columns detection#7868
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JingsongLi merged 5 commits intoMay 18, 2026
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What changed
This updates Spark merge-into data evolution update column detection so target self-assignments are not treated as modified columns when Spark adds or changes qualifiers. The logic now treats matching AttributeReference exprIds as the same target column, while still including source-side assignments such as target_col = source_col.
Why
Spark AttributeReference.equals also compares qualifiers, so the same target field can compare unequal as file_name#2 versus t.file_name#2. That made updateColumns include unchanged fields and caused partial updates to rewrite more columns than expected.
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