StandardQueryParser generates incorrect query for groups containing one term if
using default operator AND
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Key: LUCENE-3565
URL: https://issues.apache.org/jira/browse/LUCENE-3565
Project: Lucene - Java
Issue Type: Bug
Components: modules/queryparser
Affects Versions: 3.4
Reporter: Trejkaz
The following test demonstrates a bug in StandardQueryParser when
DEFAULT_OPERATOR is set to AND:
{code}
@Test
public void testDefaultOperatorSingleGrouped() throws Exception
{
StandardQueryParser parser = new StandardQueryParser();
parser.getQueryConfigHandler().set(StandardQueryConfigHandler.ConfigurationKeys.DEFAULT_OPERATOR,
StandardQueryConfigHandler.Operator.AND);
BooleanQuery expectedQuery = new BooleanQuery();
BooleanQuery innerQuery1 = new BooleanQuery();
innerQuery1.add(new TermQuery(new Term("text", "a")),
BooleanClause.Occur.MUST);
expectedQuery.add(innerQuery1, BooleanClause.Occur.SHOULD);
BooleanQuery innerQuery2 = new BooleanQuery();
innerQuery2.add(new TermQuery(new Term("text", "b")),
BooleanClause.Occur.MUST);
expectedQuery.add(innerQuery2, BooleanClause.Occur.SHOULD);
Query actualQuery = parser.parse("(a) OR (b)", "text");
assertEquals("Wrong query was generated", expectedQuery, actualQuery);
}
{code}
BooleanSingleChildOptimizationQueryNodeProcessor appears to be responsible
because if I remove it, the correct query is generated (however, doing so
breaks a number of other tests of our own.)
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