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https://issues.apache.org/jira/browse/LUCENE-8159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16385277#comment-16385277
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Robert Muir commented on LUCENE-8159:
-------------------------------------
I don't think we should add this CompiledAutomaton stuff to the public api. Its
an internal implementation detail.
It also doesn't match what the user expects since it does strange things for
low-level efficiency such as conversion to UTF-8.
> Add a copy constructor in AutomatonQuery to copy directly the compiled
> automaton
> --------------------------------------------------------------------------------
>
> Key: LUCENE-8159
> URL: https://issues.apache.org/jira/browse/LUCENE-8159
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Affects Versions: trunk
> Reporter: Bruno Roustant
> Assignee: David Smiley
> Priority: Major
> Attachments:
> 0001-Add-a-copy-constructor-in-AutomatonQuery-to-copy-dir.patch,
> LUCENE-8159.patch
>
>
> When the query is composed of multiple AutomatonQuery with the same automaton
> and which target different fields, it is much more efficient to reuse the
> already compiled automaton by copying it directly and just changing the
> target field.
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