Extend V2 SQL parser with `JOIN`/`UNION`/`MINUS` for unified query path #5444

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dai-chen wants to merge 3 commits into opensearch-project:main from dai-chen:feature/sql-v2-join-union-minus

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Extend V2 SQL parser with `JOIN`/`UNION`/`MINUS` for unified query path #5444

feat(sql): add IN/EXISTS subquery, fix UNION/MINUS schema semantics

DCO / DCO succeeded May 15, 2026 in 1s

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