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From "Todd Feak (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1415) MultiPhraseQuery has incorrect hashCode() implementation - Leads to Solr Cache misses
Date Wed, 08 Oct 2008 23:31:45 GMT
MultiPhraseQuery has incorrect hashCode() implementation - Leads to Solr Cache misses
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                 Key: LUCENE-1415
                 URL: https://issues.apache.org/jira/browse/LUCENE-1415
             Project: Lucene - Java
          Issue Type: Bug
          Components: Search
    Affects Versions: 2.4
            Reporter: Todd Feak


I found this while hunting for the cause of Solr Cache misses.

The MultiPhraseQuery class hashCode() implementation is non-deterministic. It uses termArrays.hashCode()
in the computation. The contents of that ArrayList are actually arrays themselves, which return
there reference ID as a hashCode instead of returning a hashCode which is based on the contents
of the array. I would suggest an implementation involving the Arrays.hashCode() method.

I will try to submit a patch soon, off for today.

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