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  1. Lucene - Core
  2. LUCENE-8501

An ability to define the sum method for custom term frequencies

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Won't Fix
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: core/index
    • Labels:
      None
    • Lucene Fields:
      New

      Description

      Custom term frequencies allows expert users to index and score in custom ways, however, DefaultIndexingChain adds a limitation to this as the sum of frequencies can't overflow

      try {
          invertState.length = Math.addExact(invertState.length, invertState.termFreqAttribute.getTermFrequency());
      } catch (ArithmeticException ae) {
          throw new IllegalArgumentException("too many tokens for field \"" + field.name() + "\"");
      }
      

      This might become an issue if for example the frequency data is encoded in a different way, say the specific scorer works with float frequencies.

      The sum method can be added to TermFrequencyAttribute to get something like

      invertState.length = invertState.termFreqAttribute.addFrequency(invertState.length);
      

      so users may define the summing method and avoid the owerflow exceptions.

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            • Assignee:
              Unassigned
              Reporter:
              ollik1 Olli Kuonanoja
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                Updated:
                Resolved: