Update rag_analyzer.cpp

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The AI-native database built for LLM applications, providing incredibly fast hybrid search of dense vector, sparse vector, tensor (multi-vector), and full-text

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Update rag_analyzer.cpp #2273

Closed yangzq50 closed 2 days ago

yangzq50 commented 2 days ago

What problem does this PR solve?

Improve performance of RAGAnalyzer::GetBestTokensTopN, reduce memory cost

Issue link:#2159

Type of change

[x] Refactoring
[x] Performance Improvement