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https://issues.apache.org/jira/browse/SOLR-908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737309#action_12737309
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Tom Burton-West commented on SOLR-908:
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Thanks for cleaning up the code.
I found the problem that was causing the CommonGramsQueryFilter test to fail.
CommonGramsQueryFilter checks for token type = "gram". Since the patch changed
the type to "shingle" in CommonGramsFilter,, the same change has to be made in
CommonGramsQueryFilter.
I'm suprised that adding StopFilterFactory to the end of the filter change
doesn't affect performance. I'll wait for your new patch before proceeding.
BTW you asked >>Can we change this to be a fix for 1.4?
I'd love to, but don't the committers make that decision? How do we do that?
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
> Priority: Minor
> Attachments: CommonGramsPort.zip, 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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