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https://issues.apache.org/jira/browse/LUCENE-4628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13537797#comment-13537797
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Simon Willnauer commented on LUCENE-4628:
-----------------------------------------
hey david, I suggest you look a bit closer at the code. This serves a similar
usecase but it's way more powerful. here are some differences:
* CommonGrams need to be build at index and query time - CommonTermsQuery can
be used on any index
* CommonGrams need a prebuild dictionary of high freq terms - CommonTermsQuery
can efficiently detect high freq terms at query time and "rewrite" the query
* CommonGrams can not search for high freq terms in conjunction -
CommonTermsQuery can do stuff like "this is it" or "to be or not to be" in a
conjunction query and still be reasonable in terms of performance.
makes sense?
> Add common terms query to gracefully handle very high frequent terms
> dynamically
> --------------------------------------------------------------------------------
>
> Key: LUCENE-4628
> URL: https://issues.apache.org/jira/browse/LUCENE-4628
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/other
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Priority: Minor
> Fix For: 4.1, 5.0
>
> Attachments: LUCENE-4628.patch, LUCENE-4628.patch
>
>
> I had this problem quite a couple of times the last couple of month that
> searches very often contained super high frequent terms and disjunction
> queries became way too slow. The main problem was that stopword filtering
> wasn't really an option since in the domain those high-freq terms where not
> really stopwords though. So for instance searching for a song title "this is
> it" or for a band "A" didn't really fly with stopwords. I thought about that
> for a while and came up with a query based solution that decides based on a
> threshold if something is considered a stopword or not and if so it moves the
> term in two boolean queries one for high-frequent and one for low-frequent
> such that those high frequent terms are only matched if the low-frequent
> sub-query produces a match. Yet if all terms are high frequent it makes the
> entire thing a Conjunction which gave me reasonable results as well as
> performance.
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