QueryParser.GetPrefixQuery does not use the analyzer
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Key: LUCENENET-51
URL: https://issues.apache.org/jira/browse/LUCENENET-51
Project: Lucene.Net
Issue Type: Bug
Reporter: Digy
Attachments: BugSample.cs
Hi all,
Some custom analyzers use their own LowerCase filters and Stem filters.
For ex. ÖöÜü is converted by lowercase the filter to oouu(only latin charset)
and this token is stored in the index.
But QueryParsers's GetPrefixQuery method does not use the analyzer's lowercase
filter. So it convert the token to
lowercase(which is ööüü) and a search like ÖöÜü* returns no result since Lucene
searches tokens starting with ööüü
(not with oouu) in the index.
The same is also valid for stem filters. Assume that a pseudo language's stem
filter converts the trailing "abcd" to e.
Then a search like 1234abcd* will return no result even if a token 1234e is
stored in the index.
Therefore QueryParsers.GetPrefixQuery method has to be fixed to force to use
the analyzer.
GetWildcardQuery, GetFuzzyQuery may also suffer from the same problem.
I will attach a sample code to show the bug and a patch for GetPrefixQuery
DIGY.
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