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From "Shawn Heisey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-7960) NGram filters -- add option to keep short terms
Date Fri, 04 May 2018 14:14:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-7960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16463930#comment-16463930
] 

Shawn Heisey commented on LUCENE-7960:
--------------------------------------

On first blush, an enum seems even more of a mess than one or two extra boolean parameters.
 I will let [~rcmuir] and others with more experience in these matters make the call on that.
 How would the factory (and by extension, text configuration files) handle it?

If two boolean parameters is going to meet with resistance, I can support preserveOriginal.
 I think users will want long and short handled separately, but one flag would get the job
done.


> NGram filters -- add option to keep short terms
> -----------------------------------------------
>
>                 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
>
>          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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