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https://issues.apache.org/jira/browse/LUCENE-2970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13007517#comment-13007517
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Michael McCandless commented on LUCENE-2970:
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bq. well it seems it might work for an NFA too?
Sorry, yes -- the algo doesn't care if it's N or D. It works for both.
> SpecialOperations.isFinite can have TERRIBLE TERRIBLE runtime in certain
> situations
> -----------------------------------------------------------------------------------
>
> Key: LUCENE-2970
> URL: https://issues.apache.org/jira/browse/LUCENE-2970
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 4.0
> Reporter: Robert Muir
> Assignee: Robert Muir
> Fix For: 4.0
>
> Attachments: LUCENE-2970.patch
>
>
> in an application of mine, i experienced some very slow query times with
> finite automata (all the DFAs are acyclic)
> It turned out, the slowdown is some terrible runtime in
> SpecialOperations.isFinite <-- this is used to determine if the DFA is
> acyclic or not.
> (in this case I am talking about even up to minutes of cpu).
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