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[SPARK-56450][SQL] Add merge into schema evolution test with source subquery alias#55304

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[SPARK-56450][SQL] Add merge into schema evolution test with source subquery alias#55304
szehon-ho wants to merge 1 commit intoapache:masterfrom
szehon-ho:merge-into-schema-evolution-source-alias

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What changes were proposed in this pull request?

Add tests for MERGE INTO schema evolution when the source is a subquery with projection and alias (e.g., USING (SELECT ...) AS s), covering INSERT * with and without schema evolution.

Why are the changes needed?

This source pattern was not covered by existing schema evolution tests.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

New tests in MergeIntoSchemaEvolutionExtraSQLTests, run via DeltaBasedMergeIntoSchemaEvolutionSQLSuite.

Was this patch authored or co-authored using generative AI tooling?

Generated-by: Cursor (Claude)

@szehon-ho szehon-ho force-pushed the merge-into-schema-evolution-source-alias branch from 6558005 to b4a702b Compare April 11, 2026 00:43
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szehon-ho commented Apr 11, 2026

This was from an offline conversation.

I see its asked here as well, we can add it in that pr, this is just a demonstration that this test behaves as expected #55239 (comment)

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