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https://issues.apache.org/jira/browse/LUCENE-4285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470584#comment-13470584
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Dawid Weiss commented on LUCENE-4285:
-------------------------------------
This is typically (?) done by making the root state follow an epsilon
transition. If it points to a final state it means the automaton is empty and
accepts epsilon (in other words, nothing).
But then it also adds overhead for every iteration which needs to skip over
this epsilon transition...
> Improve FST API usability for mere mortals
> ------------------------------------------
>
> Key: LUCENE-4285
> URL: https://issues.apache.org/jira/browse/LUCENE-4285
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/FSTs
> Reporter: David Smiley
>
> FST technology is something that has brought amazing advances to Lucene, yet
> the API is hard to use for the vast majority of users like me. I know that
> performance of FSTs is really important, but surely a lot can be done without
> sacrificing that.
> (comments will hold specific ideas and problems)
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