Emmanuel Keller created LUCENE-7878:
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Summary: 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: 6.5.1, 6.6, master (7.0)
Environment: 1.8.0_131-b11 on Mac OS X
Reporter: Emmanuel Keller
This issue is about using the QueryParser with MultiWordsSynonyms.
The 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 search 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 default AND, I get something wrong:
+(+guinea +pig) +cavy
I was expected:
+((+guinea +pig) +cavy)
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) +cavy", smart.parse("guinea pig
cavy").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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