Hyungi Ahn
fab3c81a0f
fix(search): Phase 1.2-B UNION 분해로 trigram/FTS 인덱스 강제 활용
EXPLAIN 진단: OR 통합 WHERE는 PostgreSQL planner가 인덱스 결합 못 함
(small table 765 docs라 Seq Scan 선택). Filter 524ms.
해결: WHERE OR을 CTE candidates UNION으로 분해.
- title trigram → idx_documents_title_trgm (0.5ms)
- ai_summary trigram → idx_documents_ai_summary_trgm (length>0 매치 추가)
- FTS @@ → idx_documents_fts_full (0.05ms)
EXPLAIN 측정: 525ms → 26ms (95% 감소).
본 SELECT(similarity 가중 합산 + ORDER BY) 추가하면 100~150ms 예상.
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