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Query parsers

  • Free text query from user may in fact spawn one or more queries to the indexes, e.g., query rising interest rates

    • Run the query as a phrase query

    • If <K docs contain the phrase rising interest rates, run the two phrase queries rising interest and interest rates

    • If we still have <K docs, run the vector space query rising interest rates

    • Rank matching docs by vector space scoring

  • This sequence is issued by a query parser

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