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https://issues.apache.org/jira/browse/LUCENE-9584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17220608#comment-17220608
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hackerwin7 edited comment on LUCENE-9584 at 10/27/20, 4:12 AM:
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I upload a patch based for 7.7.0, just check the result iterator before new
ConstantScoreScorer; but I'm not sure should we use return null to terminate
more early in BooleanWeight.scorerSupplier() just let the subScorer == null.
I believe that in PointInSetQuery.scorer()
reader.getPointValues(field) == null *is equal to* reader intersected result
is empty
this two case should both return null to terminate more early.
was (Author: hackerwin7):
I upload a patch based for 7.7.0, just check the result iterator before new
ConstantScoreScorer; but I'm not sure should we use return null to terminate
more early in BooleanWeight.scorerSupplier() just let the subScorer == null
> PointInSetQuery does not terminate early if result iterator has no docs
> -----------------------------------------------------------------------
>
> Key: LUCENE-9584
> URL: https://issues.apache.org/jira/browse/LUCENE-9584
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 7.7.3, 8.6.3
> Reporter: hackerwin7
> Priority: Major
> Labels: performance
> Attachments: LUCENE-7.7.0-PointInSetQuery_terminate_early.patch
>
>
> Today, in a point in set query after BKD intersect we get a DocIdSetBuilder
> result, if result's iterator have no docs, then the PointInSetQuery still
> create ConstantScoreScorer with an empty DocIdSetIterator.
> In a Boolean Query, such as query = subQuery1 AND subQuery2 AND subQuery3
> .... subQueryN
> if subQuery1 is a PointInSetQuery and get a empty result iterator, and
> subsequent subQuery2 ~ subQueryN would still evaluate to call build scorer,
> this is an unnecessary cost for this query.
>
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