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Posted to dev@lucene.apache.org by "Atri Sharma (JIRA)" <ji...@apache.org> on 2019/08/12 08:08:00 UTC

[jira] [Created] (LUCENE-8949) Allow LeafFieldComparators to publish feature values

Atri Sharma created LUCENE-8949:
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             Summary: Allow LeafFieldComparators to publish feature values
                 Key: LUCENE-8949
                 URL: https://issues.apache.org/jira/browse/LUCENE-8949
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Atri Sharma


We allow LeafFieldComparators to only accept a docID, get the equivalent feature value(s) and compare against the bottom/top of the values set for the comparator. This mandates that the values being compared against the bottom/top should originate from the same comparator. This does not allow use cases such as cross comparator value comparisons i.e. if a user wanted to compute the "global" minimum across multiple comparators.

 

FieldComparators expose an API to get the feature value corresponding to a docID. We should let LeafFieldComparators do the same. A new comparison method is not required since the parent FieldComparator's compare method can be used once the values are retrieved.



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