BooleanQuery.rewrite does not work properly for minNumberShouldMatch
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Key: LUCENE-1134
URL: https://issues.apache.org/jira/browse/LUCENE-1134
Project: Lucene - Java
Issue Type: Bug
Components: Search
Affects Versions: 2.4
Reporter: Shai Erera
Priority: Minor
BooleanQuery.rewrite does not respect minNumberShouldMatch if the number of
clauses is 1. This causes inconsistencies for the queries "+def" and "+abc
+def", while setting the minNumShouldMatch to '1' for both.
For the first query, results are returned although there are no SHOULD clauses
in the query.
For the second query no results are returned.
The reason lies in the optimization BooleanQuery.rewrite has for one clauses
queries.
Patch included - optimize the query for a single clause only if the
minNumShouldMatch <= 0.
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