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https://issues.apache.org/jira/browse/LUCENE-8701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16810823#comment-16810823
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ASF subversion and git services commented on LUCENE-8701:
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Commit 4b0c36b17b6253e0aad36deda5cbf87c44084ec5 in lucene-solr's branch
refs/heads/master from Jim Ferenczi
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=4b0c36b ]
LUCENE-8701: ToParentBlockJoinQuery now creates a child scorer that disallows
skipping over
non-competitive documents if the score of a parent depends on the score of
multiple
children (avg, max, min). Additionally the score mode `none` that assigns a
constant score to
each parent can early terminate top scores's collection.
> Speed up ToParentBlockJoinQuery when total hit count is not needed
> ------------------------------------------------------------------
>
> Key: LUCENE-8701
> URL: https://issues.apache.org/jira/browse/LUCENE-8701
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Jim Ferenczi
> Priority: Minor
> Attachments: LUCENE-8701.patch, LUCENE-8701.patch
>
>
> We spotted a regression on nested queries in the Elastisearch nightly track:
> https://elasticsearch-benchmarks.elastic.co/index.html#tracks/nested/nightly/30d
> It seems related to the fact that we propagate the TOP_SCORES score mode to
> the child query even though we don't compute a max score in the
> BlockJoinScorer and don't propagate the minimum score either. Since it is not
> possible to compute a max score for a document that depends on other
> documents (the children) we should probably force the score mode to COMPLETE
> to build the child scorer. This should avoid the overhead of loading and
> reading the impacts. It should also be possible to early terminate queries
> that use the ScoreMode.None mode since in this case the score of each parent
> document is the same.
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