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From "Neil Prosser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-2716) QueryResultKey hashCode() and equals() is dependent on filter order
Date Wed, 17 Aug 2011 23:04:27 GMT
QueryResultKey hashCode() and equals() is dependent on filter order
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                 Key: SOLR-2716
                 URL: https://issues.apache.org/jira/browse/SOLR-2716
             Project: Solr
          Issue Type: Improvement
          Components: search
    Affects Versions: 3.3
            Reporter: Neil Prosser
            Priority: Minor


The hashCode() and equals() methods of a QueryResultKey are dependent on the order of the
filters meaning that potentially identical result sets are missed when cached.

{{Query query = new TermQuery(new Term("field1", "value1"));
Query filter1 = new TermQuery(new Term("field2", "value2"));
Query filter2 = new TermQuery(new Term("field3", "value3"));

List<Query> filters1 = new ArrayList<Query>();
filters1.add(filter1);
filters1.add(filter2);

List<Query> filters2 = new ArrayList<Query>();
filters2.add(filter2);
filters2.add(filter1);

QueryResultKey key1 = new QueryResultKey(query, filters1, null, 0);
QueryResultKey key2 = new QueryResultKey(query, filters2, null, 0);

// Both the following assertions fail
assert key1.equals(key2);
assert key1.hashCode() == key2.hashCode();}}

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