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From "Nicholas Knize (JIRA)" <>
Subject [jira] [Updated] (LUCENE-6638) Factor graph flattening out of SynonymFilter
Date Tue, 29 Mar 2016 12:55:25 GMT


Nicholas Knize updated LUCENE-6638:
    Fix Version/s:     (was: 6.0)

> Factor graph flattening out of SynonymFilter
> --------------------------------------------
>                 Key: LUCENE-6638
>                 URL:
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: master, 6.x
>         Attachments: LUCENE-6638.patch, LUCENE-6638.patch
> Spinoff from LUCENE-6582.
> SynonymFilter is very hairy, and has known nearly-impossible-to-fix bugs: it produces
the wrong graph, both accepting too many phrases and not enough phrases, because it never
creates new positions.
> This makes improvements like LUCENE-6582, to fix some of its bugs, unnecessarily hard.
> I'd like to pull out the graph flattening into its own token filter, and I think I have
a starting patch that works.  I started with the "sausagizer" stage on the branch from LUCENE-5012,
but changed the approach so that it should not have so many adversarial cases.
> I think this should make SynonymFilter quite a bit simpler, hopefully to the point where
we can just fix its bugs already.

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