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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2015/03/14 23:12:38 UTC

[jira] [Created] (LUCENE-6360) TermsQuery should rewrite to a ConstantScoreQuery over a BooleanQuery when there are few terms

Adrien Grand created LUCENE-6360:
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             Summary: TermsQuery should rewrite to a ConstantScoreQuery over a BooleanQuery when there are few terms
                 Key: LUCENE-6360
                 URL: https://issues.apache.org/jira/browse/LUCENE-6360
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand
            Assignee: Adrien Grand
            Priority: Minor


TermsQuery helps when there are lot of terms from which you would like to compute the union, but it is a bit harmful when you have few terms since it cannot really skip: it always consumes all documents matching the underlying terms.

It would certainly help to rewrite this query to a ConstantScoreQuery over a BooleanQuery when there are few terms in order to have actual skip support.

As usual the hard part is probably to figure out the threshold. :)



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