[PoC] SQL/PPL support for analytics engine#10

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poc/analytics-integ-unified-query-pipeline-v2

Commits on Mar 16, 2026

docs: Add PoC Option B plan for unified query pipeline
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docs: Refine Phase 1 and Phase 4 in PoC Option B plan
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feat: Add ANSI SQL RelNode generation to UnifiedQueryPlanner
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test: Add PPL RelNode tests validating no UDT contamination
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feat: Add REST routing and AnalyticsExecutionEngine for Parquet queries
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feat: Add analytics-engine-stub module with SPI interfaces and schema builder
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test: Add integration test for unified query pipeline
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test: Add fluent ITs for unified query pipeline with explain assertions
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docs: Update PoC plan with Guice integration findings
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Commits on Mar 17, 2026