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https://issues.apache.org/jira/browse/LUCENE-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jim Ferenczi resolved LUCENE-7878.
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Resolution: Fixed
Thanks @jpountz and Emmanuel for finding this nasty bug!
It is merged in 6.6 so if we do a 6.6.1 release it will be part of it,
otherwise it will be available in 6.7.
> QueryParser AND default operator and MultiWords synonyms failed if keywords
> exactly matches a synonym
> -----------------------------------------------------------------------------------------------------
>
> Key: LUCENE-7878
> URL: https://issues.apache.org/jira/browse/LUCENE-7878
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/queryparser
> Affects Versions: master (7.0), 6.6, 6.6.1
> Environment: 1.8.0_131-b11 on Mac OS X
> Reporter: Emmanuel Keller
> Labels: multi-word, query-parser, synonyms
> Fix For: master (7.0), 6.7
>
> Attachments: LUCENE-7878.patch, LUCENE-7878.patch
>
>
> This issue is about using the QueryParser with MultiWordsSynonyms.
> To reproduce the bug:
> - Use AND as default operator
> - Use a query string which exactly matches one synonym.
> In short, the part of the query which handle the synonym lookup should keep a
> "OR" relation between the synonyms, but it is translated as a "AND".
> If I parse: "guinea pig" which is a synonym of "cavy":
> Using default OR, I get something correct:
> "(+guinea +pig) cavy"
> Note: I should probably better have ((+guinea +pic) cavy)
> Using AND as default operator, I get something wrong:
> +(+guinea +pig) +cavy
> I was expected:
> +((+guinea +pig) cavy)
> The relation between "guinea pig" and "cavy" is now a AND. It should be still
> a OR because it is a synonym clause.
> To help understanding. If now I parse "guinea pig world"
> And I get the expected result:
> +((+guinea +pig) cavy) +world
> The relation between "guinea pig" and "cavy" is a OR as expected (it is a
> synonym), and the relation with "world" is AND as expected by the default
> operator.
> Here is the additional unit test for, I hope it is pretty self-explanatory:
> org.apache.lucene.queryparser.classic.TestQueryParser
> {code:java}
> public void testDefaultOperatorWhenKeywordsMatchesExactlyOneSynonym() throws
> ParseException {
> // Using the default OR operator
> QueryParser smart = new QueryParser("field", new Analyzer1());
> smart.setSplitOnWhitespace(false);
> smart.setDefaultOperator(Operator.OR);
> assertEquals("(+guinea +pig) cavy", smart.parse("guinea
> pig").toString("field"));
> // Using the default AND operator
> smart = new QueryParser("field", new Analyzer1());
> smart.setSplitOnWhitespace(false);
> smart.setDefaultOperator(Operator.AND);
> assertEquals("+((+guinea +pig) cavy) +world", smart.parse("guinea pig
> world").toString("field"));
> // Using the default AND operator
> smart = new QueryParser("field", new Analyzer1());
> smart.setSplitOnWhitespace(false);
> smart.setDefaultOperator(Operator.AND);
> assertEquals("+((+guinea +pig) cavy)", smart.parse("guinea
> pig").toString("field"));
> }
> {code}
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