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https://issues.apache.org/jira/browse/LUCENE-7295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15295687#comment-15295687
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Robert Muir commented on LUCENE-7295:
-------------------------------------

I think the historical pain here was that you can't easily impl this stuff so 
that equals means "same language" unless you do minimization?

Either way toDot() is crazy :)

> TermAutomatonQuery.hashCode calculates Automaton.toDot().hash
> -------------------------------------------------------------
>
>                 Key: LUCENE-7295
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7295
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Dawid Weiss
>            Priority: Minor
>
> This is going to be excruciatingly slow? We could at least cache the hash 
> code once computed...



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