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Posted to dev@lucene.apache.org by "Nathan Gass (JIRA)" <ji...@apache.org> on 2017/03/13 13:16:41 UTC

[jira] [Created] (LUCENE-7744) default value for scoring payloads

Nathan Gass created LUCENE-7744:
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             Summary: default value for scoring payloads
                 Key: LUCENE-7744
                 URL: https://issues.apache.org/jira/browse/LUCENE-7744
             Project: Lucene - Core
          Issue Type: New Feature
          Components: core/query/scoring
            Reporter: Nathan Gass
            Priority: Minor


In lucene 5, PayloadTermQuery used a hardcoded default of 1.0 for terms without a payload. The replacing PayloadScoreQuery in lucene 6 just ignores those terms. This is unflexible and wrong for many use cases (for example using Payloads to deemphasize some terms, where terms without payload should result in maximum score instead of being ignored).

In my pull request I defer the decision on what to do with missing payloads to the scorePayload method of the similarity, which has to check the given payload for null and handle that case. I believe this breaks backwards compatibility?



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