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From Koji Sekiguchi <k...@r.email.ne.jp>
Subject Re: [jira] Resolved: (LUCENE-2458) queryparser makes all CJK queries phrase queries regardless of analyzer
Date Sat, 24 Jul 2010 02:16:14 GMT
(10/07/20 4:26), Robert Muir (JIRA) wrote:
>       [ https://issues.apache.org/jira/browse/LUCENE-2458?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
>
> Robert Muir resolved LUCENE-2458.
> ---------------------------------
>
>      Resolution: Fixed
>
> Committed revision 965585 / 965592 (3x)
>
>    
>> queryparser makes all CJK queries phrase queries regardless of analyzer
>> -----------------------------------------------------------------------
>>
>>                  Key: LUCENE-2458
>>                  URL: https://issues.apache.org/jira/browse/LUCENE-2458
>>              Project: Lucene - Java
>>           Issue Type: Bug
>>           Components: QueryParser
>>             Reporter: Robert Muir
>>             Assignee: Robert Muir
>>             Priority: Blocker
>>              Fix For: 3.1, 4.0
>>
>>          Attachments: LUCENE-2458.patch, LUCENE-2458.patch, LUCENE-2458.patch, LUCENE-2458.patch
>>
>>
>> The queryparser automatically makes *ALL* CJK, Thai, Lao, Myanmar, Tibetan, ... queries
into phrase queries, even though you didn't ask for one, and there isn't a way to turn this
off.
>> This completely breaks lucene for these languages, as it treats all queries like
'grep'.
>> Example: if you query for f:abcd with standardanalyzer, where a,b,c,d are chinese
characters, you get a phrasequery of "a b c d". if you use cjk analyzer, its no better, its
a phrasequery of  "ab bc cd", and if you use smartchinese analyzer, you get a phrasequery
like "ab cd". But the user didn't ask for one, and they cannot turn it off.
>> The reason is that the code to form phrase queries is not internationally appropriate
and assumes whitespace tokenization. If more than one token comes out of whitespace delimited
text, its automatically a phrase query no matter what.
>> The proposed patch fixes the core queryparser (with all backwards compat kept) to
only form phrase queries when the double quote operator is used.
>> Implementing subclasses can always extend the QP and auto-generate whatever kind
of queries they want that might completely break search for languages they don't care about,
but core general-purpose QPs should be language independent.
>>      
>    
Hello,

After committed this, my junit tests don't work. The tests
are for my own plugin for FastVectorHighlighter that use
2-gram analyzer. To pass the tests, I have to quote test data
or call setAutoGeneratePhraseQueries( true ).

I think I need chance to set setAutoGeneratePhraseQueries()
to true in Solr. Without it, clients have to quote query string.

Therefore, I'd like to introduce something like
<setAutoGeneratePhraseQueries>true or false</setAutoGeneratePhraseQueries>
tag in solrconfig.xml... Is it a bad idea?

I might be missing something here... Please advise me.

Koji

-- 
http://www.rondhuit.com/en/


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