DisjunctionMaxQuery has incorrect hashCode() implementation
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Key: LUCENE-2146
URL: https://issues.apache.org/jira/browse/LUCENE-2146
Project: Lucene - Java
Issue Type: Bug
Components: Search
Affects Versions: 2.9
Reporter: wang
Priority: Minor
The DisjunctionMaxQuery class hashCode() implementation is non-deterministic.
It uses disjuncts.hashCode() in the computation.
if the contents of disjuncts are arrays, just as DisjunctionMaxQueryTest.
ArrayList list1
= new ArrayList();
ArrayList list2 = new ArrayList();
String[] terms ={"term1","term2"};
String[] terms2 ={"term1","term2"};
list1.add(terms);
list2.add(terms2);
DisjunctionMaxQuery query1 = new
DisjunctionMaxQuery(list1,0.0f);
DisjunctionMaxQuery query2 = new
DisjunctionMaxQuery(list2,0.0f);
according to the definition of DisjunctionMaxQuery, i think query1 and query2
should be equal.
but DisjunctionMaxQueryTest failed. That is because
DisjunctionMaxQuery.hashCode(){disjuncts.hasCode()};
maybe my thought is wrong.
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