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Date: Mon, 30 Apr 2012 17:03:48 +0000 (UTC)
From: "Michael McCandless (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Updated] (LUCENE-3830) MappingCharFilter could be improved
 by switching to an FST.
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     [ https://issues.apache.org/jira/browse/LUCENE-3830?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless updated LUCENE-3830:
---------------------------------------

    Attachment: LUCENE-3830.patch

Patch; I think it's basically working.

I disallow empty string match to be added (this was accepted, but I think ignored, before), so I had to fix a couple places that were doing that.

I also added another random test that separately (slowly) computes the output & corrected offsets and then compares ... it's passing.

I still need to do a perf test.. does anyone have a "typical" set of mappings + content I could use?  Else I'll try to come up with something...
                
> MappingCharFilter could be improved by switching to an FST.
> -----------------------------------------------------------
>
>                 Key: LUCENE-3830
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3830
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Dawid Weiss
>            Assignee: Michael McCandless
>            Priority: Minor
>              Labels: gsoc2012, lucene-gsoc-12
>             Fix For: 4.0
>
>         Attachments: LUCENE-3830.patch
>
>
> MappingCharFilter stores an overly complex tree-like structure for matching input patterns. The input is a union of fixed strings mapped to a set of fixed strings; an fst matcher would be ideal here and provide both memory and speed improvement I bet.

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