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feat(sql): implement UNION ALL support #144

@aviralgarg05

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@aviralgarg05

Summary

Implement UNION ALL support for compatible SELECT queries.

Why

Set operations are roadmap items and unlock many analytical query flows.

Tasks

  • Add parser support for UNION ALL
  • Extend planning/execution to combine row streams from both subqueries
  • Validate column count/type compatibility for unioned queries
  • Add integration tests

Acceptance Criteria

  • UNION ALL executes for compatible SELECTs
  • Incompatible schemas return clear errors
  • Existing non-UNION queries remain unaffected

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