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https://issues.apache.org/jira/browse/LUCENE-6638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-6638.
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Resolution: Duplicate
This was done with LUCENE-6664, as the new {{FlattenGraphFilter}}.
> Factor graph flattening out of SynonymFilter
> --------------------------------------------
>
> Key: LUCENE-6638
> URL: https://issues.apache.org/jira/browse/LUCENE-6638
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 6.x, 6.0
>
> 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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