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https://issues.apache.org/jira/browse/LUCENE-3565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13877912#comment-13877912
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Trejkaz commented on LUCENE-3565:
---------------------------------
Seems to have been fixed in 3.6.2.
> StandardQueryParser generates incorrect query for groups containing one term
> if using default operator AND
> ----------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-3565
> URL: https://issues.apache.org/jira/browse/LUCENE-3565
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/queryparser
> Affects Versions: 3.4
> Reporter: Trejkaz
> Labels: queryparser
>
> 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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