Reuse DocumentRowMapper instance to reduce redundant object creation #3564
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This PR addresses the issue of creating a new
DocumentRowMapperinstance on every call to thedoSimilaritySearch()method.DocumentRowMapperis a stateless RowMapper and does not need to be created repeatedly.In this PR,
DocumentRowMapperhas been declared as a final field of the class, initialized once during instance creation, and reused across subsequent calls.Additionally, the unused variable
COLUMN_EMBEDDING, defined in theDocumentRowMapperclass, has been removed.This variable became unused as a result of #1826 and the corresponding ebd29e0.