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  1. Lucene - Core
  2. LUCENE-8031

DOCS_ONLY fields set incorrect length norms

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    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).

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            • Assignee:
              Unassigned
              Reporter:
              rcmuir Robert Muir

              Dates

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                Updated:
                Resolved:

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