Uploaded image for project: 'Lucene - Core'
  1. Lucene - Core
  2. LUCENE-8031

DOCS_ONLY fields set incorrect length norms

    XMLWordPrintableJSON

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 8.0
    • Component/s: None
    • Labels:
      None
    • Lucene Fields:
      New

      Description

      Term frequencies are discarded in the DOCS_ONLY case from the postings list but they still count against the length normalization, which looks like it may screw stuff up.

      I ran some quick experiments on LUCENE-8025, by encoding fieldInvertState.getUniqueTermCount() and it seemed worth fixing (e.g. 20% or 30% improvement potentially). Happy to do testing for real, if we want to fix.

      But this seems tricky, today you can downgrade to DOCS_ONLY on the fly, and its hard for me to think about that case (i think its generally screwed up besides this, but still).

        Attachments

        1. LUCENE-8031.patch
          12 kB
          Robert Muir

          Activity

            People

            • Assignee:
              Unassigned
              Reporter:
              rcmuir Robert Muir
            • Votes:
              0 Vote for this issue
              Watchers:
              5 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: