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https://issues.apache.org/jira/browse/LUCENE-8159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16377952#comment-16377952
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David Smiley commented on LUCENE-8159:
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bq. expose an expert constructor that takes a compiled automaton and expect
users to compile the automaton themselves if they plan to reuse it in multiple
queries?
+1 but I think it would be helpful to also provide access to the
CompiledAutomaton from an existing AutomatonQuery -- e.g.
AutomatonQuery.getCompiledAutomaton(). Not only would that be useful for
rewriting an AutomatonQuery to change the field, but it would also be useful in
the UnifiedHighlighter's MultiTermHighlighting line ~144 to avoid rebuilding
the CompiledAutomaton from an existing AQ.
> 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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