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feat(sql-plan): composite/instance-bound joins, aggregate_source, deterministic emission, final_dedup latest - #22

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dmautz1 merged 9 commits into

DocumentDrivenDX:mainfrom

dmautz1:feat/sql-plan-composite-stack

Aug 31, 2026

Commits on Aug 31, 2026
- feat(sql-plan): composite join keys + full_outer join_type
  
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- feat(sql-plan): instance-bound relationships — one table, two keys
  
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- feat(sql-plan): aggregate_source base strategy — the GROUP BY IS the table
  
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- fix(sql-plan): physical-name and prefixed-ref consistency in column requirement attribution
  
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- fix(sql-plan): sort intermediate-required base columns for deterministic output
  
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- feat(sql-plan): final_dedup 'latest' — declared-grain QUALIFY dedupe at final assembly
  
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- docs(helix): FEAT-019 covers relationship-driven sql-plan composition
  
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- style: ruff format for cherry-picked sql-plan sources and tests
  
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- fix(sql-plan): pyright narrowing for physical-name canonical columns
  
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