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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, 13 Aug 2009 21:03:14 GMT

    [ https://issues.apache.org/jira/browse/SOLR-908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12742959#action_12742959
] 

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

Hi Jason,

Thanks for all your work on this. 

I would be inclined to not deal with supporting slop at this point.  

I guess slop of more than 0 will work as long as the query matches the commongrams exactly.
 (so each commongram gets treated as one token for calculating slop).  Otherwise it would
seem that you would have to generate commongrams for each combination of a common word and
words n edit distance away to support a slop of n.  At least for our use case, the increase
in the size of the index would not be worth it.  

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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