Dawid Weiss created LUCENE-7922:

             Summary: Remove packed FST support?
                 Key: LUCENE-7922
                 URL: https://issues.apache.org/jira/browse/LUCENE-7922
             Project: Lucene - Core
          Issue Type: Task
            Reporter: Dawid Weiss
            Assignee: Dawid Weiss
             Fix For: 7.0

I've been looking at the FST code we have today. Complex to read, even more 
complex to modify. I think it could benefit if we cleaned it up a bit (there 
are a few issues out there already that mention this).

The first baby step would be to remove the "packed" representation of FSTs -- I 
searched the codebase and I don't see a single place where {{pack}} would 
actually be {{true}}. The overhead associated with node packing seems to be not 
worth it in practice (since most FSTs are already fairly small).

It'd be a breaking API change, but it's probably something worth undertaking 
for 7.0, unless I'm missing some use cases.

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