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https://issues.apache.org/jira/browse/LUCENE-8159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16378373#comment-16378373
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Bruno Roustant edited comment on LUCENE-8159 at 2/27/18 10:44 AM:
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{quote}I's rather like to 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?
{quote}
I can speak as such a "user" as I'm having this use case. We often build
queries with the same prefix/wildcard query for multiple different fields (and
sometimes many fields - in this case the optimization does help). As a user I
really appreciate to simply copy a PrefixQuery or WildcardQuery, rather than
building the automaton myself. The inner automaton inside PrefixQuery is
hidden, and the logic is internal to the PrefixQuery. I don't want to know
myself how it is built.
I agree with exposing the compiled automaton.
{quote}Should PrefixQuery & WildcardQuery & TermRangeQuery have the same
constructors too?
{quote}
I indeed prepared the same copy constructors for these classes. I didn't have
time to resubmit the patch yet, but that's the idea, yes.
was (Author: bruno.roustant):
{quote}I's rather like to 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?
{quote}
I can speak as such a "user" as I'm having this use case. We often build
queries with the same prefix/wildcard query for multiple different fields (and
sometimes many fields). As a user I really appreciate to simply copy a
PrefixQuery or WildcardQuery, rather than building the automaton myself. The
inner automaton inside PrefixQuery is hidden, and the logic is internal to the
PrefixQuery. I don't want to know myself how it is built.
I agree with exposing the compiled automaton.
{quote}Should PrefixQuery & WildcardQuery & TermRangeQuery have the same
constructors too?
{quote}
I indeed prepared the same copy constructors for these classes. I didn't have
time to resubmit the patch yet, but that's the idea, yes.
> 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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