Query#mergeBooleanQueries argument should be of type BooleanQuery[] instead of 
Query[]
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                 Key: LUCENE-1694
                 URL: https://issues.apache.org/jira/browse/LUCENE-1694
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Search
            Reporter: Simon Willnauer
             Fix For: 2.9


The method #mergeBooleanQueries accepts Query[] and casts elements to 
BooleanQuery without checking. This will guarantee a ClassCastException if it 
is not a boolean query. We should enforce this by changing the signature. This 
won't really break back compat. as it only works with instances of BooleanQuery.



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