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  1. Lucene - Core
  2. LUCENE-8229

Add a method to Weight to retrieve matches for a single document

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    Details

    • Type: New Feature
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 7.4
    • Component/s: None
    • Labels:
      None
    • Lucene Fields:
      New

      Description

      The ability to find out exactly what a query has matched on is a fairly frequent feature request, and would also make highlighters much easier to implement.  There have been a few attempts at doing this, including adding positions to Scorers, or re-writing queries as Spans, but these all either compromise general performance or involve up-front knowledge of all queries.

      Instead, I propose adding a method to Weight that exposes an iterator over matches in a particular document and field.  It should be used in a similar manner to explain() - ie, just for TopDocs, not as part of the scoring loop, which relieves some of the pressure on performance.

        Attachments

        1. LUCENE-8229_small_improvements.patch
          4 kB
          David Smiley
        2. LUCENE-8229.patch
          122 kB
          Alan Woodward

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              • Assignee:
                romseygeek Alan Woodward
                Reporter:
                romseygeek Alan Woodward
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