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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