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From "Tom Burton-West (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-908) Port of Nutch CommonGrams filter to Solr
Date Thu, 27 Aug 2009 16:23:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12748423#action_12748423
] 

Tom Burton-West commented on SOLR-908:
--------------------------------------

Hi Jason,

If the last non-common word in a query is part of the previous common-gram then it gets removed
by design.  
i.e.    query=" see the hat"  query filter output should be |see-the|the-hat|

Is this a different case?  The test cases should have caught the bug.  Maybe we need to add
a few more test cases. Could you send me a test case that shows the bug?  

Tom

> Port of Nutch  CommonGrams filter to Solr
> -----------------------------------------
>
>                 Key: SOLR-908
>                 URL: https://issues.apache.org/jira/browse/SOLR-908
>             Project: Solr
>          Issue Type: Wish
>          Components: Analysis
>            Reporter: Tom Burton-West
>            Assignee: Shalin Shekhar Mangar
>            Priority: Minor
>         Attachments: CommonGramsPort.zip, SOLR-908.patch, SOLR-908.patch, SOLR-908.patch,
SOLR-908.patch, SOLR-908.patch, SOLR-908.patch
>
>
> Phrase queries containing common words are extremely slow.  We are reluctant to just
use stop words due to various problems with false hits and some things becoming impossible
to search with stop words turned on. (For example "to be or not to be", "the who", "man in
the moon" vs "man on the moon" etc.)  
> Several postings regarding slow phrase queries have suggested using the approach used
by Nutch.  Perhaps someone with more Java/Solr experience might take this on.
> It should be possible to port the Nutch CommonGrams code to Solr  and create a suitable
Solr FilterFactory so that it could be used in Solr by listing it in the Solr schema.xml.
> "Construct n-grams for frequently occuring terms and phrases while indexing. Optimize
phrase queries to use the n-grams. Single terms are still indexed too, with n-grams overlaid."
> http://lucene.apache.org/nutch/apidocs-0.8.x/org/apache/nutch/analysis/CommonGrams.html

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