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From "Digy (JIRA)" <>
Subject [jira] Created: (LUCENENET-51) QueryParser.GetPrefixQuery does not use the analyzer
Date Mon, 09 Jul 2007 18:06:04 GMT
QueryParser.GetPrefixQuery does not use the analyzer

                 Key: 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

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 


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