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From "Michael McCandless (JIRA)" <>
Subject [jira] [Created] (LUCENE-6638) Factor graph flattening out of SynonymFilter
Date Mon, 29 Jun 2015 21:18:04 GMT
Michael McCandless created LUCENE-6638:

             Summary: Factor graph flattening out of SynonymFilter
                 Key: LUCENE-6638
             Project: Lucene - Core
          Issue Type: New Feature
            Reporter: Michael McCandless
            Assignee: Michael McCandless
             Fix For: 5.3, Trunk

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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