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https://issues.apache.org/jira/browse/LUCENE-4285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470555#comment-13470555
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David Smiley commented on LUCENE-4285:
--------------------------------------

I just found out that an FST builder.finish() returns null if there's no input 
basically.  That is bad API design; it should return an FST with nothing init.  
For now I have to have littered null checks.
                
> 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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