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Posted to dev@lucene.apache.org by "Alan Woodward (JIRA)" <ji...@apache.org> on 2017/10/26 09:59:00 UTC

[jira] [Created] (LUCENE-8017) FunctionRangeQuery and FunctionMatchQuery can pollute the QueryCache

Alan Woodward created LUCENE-8017:
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             Summary: FunctionRangeQuery and FunctionMatchQuery can pollute the QueryCache
                 Key: LUCENE-8017
                 URL: https://issues.apache.org/jira/browse/LUCENE-8017
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Alan Woodward
            Assignee: Alan Woodward


The QueryCache assumes that queries will return the same set of documents when run over the same segment, independent of all other segments held by the parent IndexSearcher.  However, both FunctionRangeQuery and FunctionMatchQuery can select hits based on score, which depend on term statistics over the whole index, and could therefore theoretically return different result sets on a given segment.



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