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From "Michael Semb Wever (JIRA)" <>
Subject [jira] Commented: (LUCENE-1380) Patch for ShingleFilter.enablePositions
Date Sat, 13 Sep 2008 14:38:44 GMT


Michael Semb Wever commented on LUCENE-1380:

Ok. So there's no way to do it through configuration only.
Would a patch with such a TokenFilter be useful for anybody else other than ShingleFilter
users? Again i'm a newbie here but i suspect there's no other filter (yet) which works _across_
the tokens (and hence breaks down the importance of positionIncrement) within a query in the
way ShingleFilter does. for example from the mailing list from steve:
> On the other hand, I'm not sure how useful position information is for shingles in the
general case: they already have relative position info 
> embedded within them.  And how likely is it that one would want to perform a phrase/span
query over shingles?  Pretty unlikely, ...

> Patch for ShingleFilter.enablePositions
> ---------------------------------------
>                 Key: LUCENE-1380
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/analyzers
>            Reporter: Michael Semb Wever
>            Assignee: Karl Wettin
>             Fix For: 2.4
>         Attachments: LUCENE-1380.patch, LUCENE-1380.patch
> Make it possible for *all* words and shingles to be placed at the same position.
> Default is to place each shingle at the same position as the unigram (or first shingle
if outputUnigrams=false). That is, each coterminal token has positionIncrement=1 and every
other token a positionIncrement=0. 
> This leads to a MultiPhraseQuery where at least one word/shingle must be matched from
each word/token. This is not always desired. 
> See for mailing list thread.

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