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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-7960) NGram filters -- preserve the original token when it is outside the min/max size range
Date Wed, 09 May 2018 00:33:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-7960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16468161#comment-16468161
] 

Robert Muir commented on LUCENE-7960:
-------------------------------------

Also for the full ctor that allows a range, i really still think it needs some wording, a
warning of sorts, that a big range is really the same (space/time-wise) as indexing the content
N different ways. It may be also good to include the fact that if you pass {{true}} for preserveOriginal,
its like indexing the content yet another time.

The ctor that just takes a fixed "n" for the n-gram doesn't need such warnings, its pretty
safe.

> NGram filters -- preserve the original token when it is outside the min/max size range
> --------------------------------------------------------------------------------------
>
>                 Key: LUCENE-7960
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7960
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/analysis
>            Reporter: Shawn Heisey
>            Priority: Major
>         Attachments: LUCENE-7960.patch, LUCENE-7960.patch, LUCENE-7960.patch
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> When ngram or edgengram filters are used, any terms that are shorter than the minGramSize
are completely removed from the token stream.
> This is probably 100% what was intended, but I've seen it cause a lot of problems for
users.  I am not suggesting that the default behavior be changed.  That would be far too disruptive
to the existing user base.
> I do think there should be a new boolean option, with a name like keepShortTerms, that
defaults to false, to allow the short terms to be preserved.



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