[jira] [Commented] (LUCENE-5012) Make graph-based TokenFilters easier

["David Smiley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-5012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15670617#comment-15670617 ] 

David Smiley commented on LUCENE-5012:
--------------------------------------

Seems very promising. Is LUCENE-2450 a dependency on this issue?  There's no dependency JIRA issue link the first comment suggests it is.

> Make graph-based TokenFilters easier
> ------------------------------------
>
>                 Key: LUCENE-5012
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5012
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/analysis
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>         Attachments: LUCENE-5012.patch
>
>
> SynonymFilter has two limitations today:
>   * It cannot create positions, so eg dns -> domain name service
>     creates blatantly wrong highlights (SOLR-3390, LUCENE-4499 and
>     others).
>   * It cannot consume a graph, so e.g. if you try to apply synonyms
>     after Kuromoji tokenizer I'm not sure what will happen.
> I've thought about how to fix these issues but it's really quite
> difficult with the current PosInc/PosLen graph representation, so I'd
> like to explore an alternative approach.



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