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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