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https://issues.apache.org/jira/browse/LUCENE-3830?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-3830:
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Attachment: PerfTestMappingCharFilter.java
LUCENE-3830.patch
New patch: I made a simple perf test (attached:
PerfTestMappingCharFilter.java), and found the FST was slower... I
fixed RollingCharBuffer to bulk read, and also pre-cache the FST arcs
in a HashMap (FST pre-caches only latin bytes), and now perf is a bit
faster. I also switched to builder API (like SynFilter) so
the NormalizeCharMap instance is immutable.
I think it's ready!
We can separately improve the matching algo based on the 23 page
paper...
> 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, LUCENE-3830.patch,
> PerfTestMappingCharFilter.java
>
>
> 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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