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https://issues.apache.org/jira/browse/LUCENE-7922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dawid Weiss updated LUCENE-7922:
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    Attachment: node.patch

Didn't run tests, but I don't think it'll cause any harm to remove it. 

> 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
>         Attachments: node.patch
>
>
> 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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