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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-6468) Regression: StopFilterFactory doesn't work properly without enablePositionIncrements="false"
Date Tue, 02 Sep 2014 10:18:21 GMT

    [ https://issues.apache.org/jira/browse/SOLR-6468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14118076#comment-14118076
] 

Uwe Schindler commented on SOLR-6468:
-------------------------------------

You have to enable enablePositionIncrements="false" and  matchVersion="4.4" on the StopFilterFactory,
otherwise you get IllegalArgumentException: "enablePositionIncrements=false is not supported
anymore as of Lucene 4.4 as it can create broken token streams".

> Regression: StopFilterFactory doesn't work properly without enablePositionIncrements="false"
> --------------------------------------------------------------------------------------------
>
>                 Key: SOLR-6468
>                 URL: https://issues.apache.org/jira/browse/SOLR-6468
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 4.8.1, 4.9
>            Reporter: Alexander S.
>
> Setup:
> * Schema version is 1.5
> * Field config:
> {code}
> <fieldType name="words_ngram" class="solr.TextField" omitNorms="false" autoGeneratePhraseQueries="true">
>   <analyzer>
>     <tokenizer class="solr.PatternTokenizerFactory" pattern="[^\w]+" />
>     <filter class="solr.StopFilterFactory" words="url_stopwords.txt" ignoreCase="true"
/>
>     <filter class="solr.LowerCaseFilterFactory" />
>   </analyzer>
> </fieldType>
> {code}
> * Stop words:
> {code}
> http 
> https 
> ftp 
> www
> {code}
> So very simple. In the index I have:
> * twitter.com/testuser
> All these queries do match:
> * twitter.com/testuser
> * com/testuser
> * testuser
> But none of these does:
> * https://twitter.com/testuser
> * https://www.twitter.com/testuser
> * www.twitter.com/testuser
> Debug output shows:
> "parsedquery_toString": "+(url_words_ngram:\"? twitter com testuser\")"
> But we need:
> "parsedquery_toString": "+(url_words_ngram:\"twitter com testuser\")"
> Complete debug outputs:
> * a valid search: http://pastie.org/pastes/9500661/text?key=rgqj5ivlgsbk1jxsudx9za
> * an invalid search: http://pastie.org/pastes/9500662/text?key=b4zlh2oaxtikd8jvo5xaww
> The complete discussion and explanation of the problem is here: http://lucene.472066.n3.nabble.com/Help-with-StopFilterFactory-td4153839.html
> I didn't find a clear explanation how can we upgrade Solr, there's no any replacement
or a workarround to this, so this is not just a major change but a major disrespect to all
existing Solr users who are using this feature.



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