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https://issues.apache.org/jira/browse/LUCENE-6570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14593486#comment-14593486
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Yonik Seeley commented on LUCENE-6570:
--------------------------------------
Maybe we could satisfy people who want different things by having BooleanQuery
be an abstract class.
Things like defensive clones could be part of the default builder, but expert
users could avoid the overhead of extra data structures introduced in
LUCENE-6305 for example. It would give a way for well-behaved code that
generates predictable queries to get maximum performance and minimum memory
usage.
> Make BooleanQuery immutable
> ---------------------------
>
> Key: LUCENE-6570
> URL: https://issues.apache.org/jira/browse/LUCENE-6570
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 6.0
>
> Attachments: LUCENE-6570.patch
>
>
> In the same spirit as LUCENE-6531 for the PhraseQuery, we should make
> BooleanQuery immutable.
> The plan is the following:
> - create BooleanQuery.Builder with the same setters as BooleanQuery today
> (except setBoost) and a build() method that returns a BooleanQuery
> - remove setters from BooleanQuery (except setBoost)
> I would also like to add some static utility methods for common use-cases of
> this query, for instance:
> - static BooleanQuery disjunction(Query... queries) to create a disjunction
> - static BooleanQuery conjunction(Query... queries) to create a conjunction
> - static BooleanQuery filtered(Query query, Query... filters) to create a
> filtered query
> Hopefully this will help keep tests not too verbose, and the latter will also
> help with the FilteredQuery derecation/removal.
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