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https://issues.apache.org/jira/browse/LUCENE-10224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mayya Sharipova updated LUCENE-10224:
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Description:
Currently MultiCollector::MultiLeafCollector doesn't implement
competitiveIterator; so it doesn't have an ability to skip non-competitive
documents on field sort. Check when it is useful to have this ability : 1)
e.g. when MultiCollector contains only a single sub-collector 2) when multiple
sub-collectors have the same sort fields
Another thing we need to do is to disable skipping functionality of all
sub-collectors if the combined scoreMode of MultiCollectors is
scoreMode.isExhaustive() == true. Because currently is one of sub-collectors is
TopFieldCollector and its scoreMode is not exhaustive, it will update its
competitiveIterator when its hits threshold is reached, even though we will
never end up using this competitiveIterator, so useless work is done here.
Relates to https://issues.apache.org/jira/browse/LUCENE-9280
was:
Currently MultiCollector::MultiLeafCollector doesn't implement
competitiveIterator; so it doesn't have an ability to skip non-competitive
documents on field sort. Check when it is useful to have this ability : 1)
e.g. when MultiCollector contains only a single sub-collector 2) when multiple
sub-collectors have the same sort fields
Another thing we need to do is to disable skipping functionality of all
sub-collectors if the combined scoreMode of MultiCollectors is
scoreMode.isExhaustive() == true. Because currently is one of sub-collectors is
TopFieldCollector and its scoreMode is not exhaustive, it will update its
competitiveIterator when its hits threshold is reached, even though we will
never end up using this competitiveIterator, so useless work here.
Relates to https://issues.apache.org/jira/browse/LUCENE-9280
> MultiCollector to control skipping docs on field sort
> -----------------------------------------------------
>
> Key: LUCENE-10224
> URL: https://issues.apache.org/jira/browse/LUCENE-10224
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Mayya Sharipova
> Priority: Minor
>
> Currently MultiCollector::MultiLeafCollector doesn't implement
> competitiveIterator; so it doesn't have an ability to skip non-competitive
> documents on field sort. Check when it is useful to have this ability : 1)
> e.g. when MultiCollector contains only a single sub-collector 2) when
> multiple sub-collectors have the same sort fields
> Another thing we need to do is to disable skipping functionality of all
> sub-collectors if the combined scoreMode of MultiCollectors is
> scoreMode.isExhaustive() == true. Because currently is one of sub-collectors
> is TopFieldCollector and its scoreMode is not exhaustive, it will update its
> competitiveIterator when its hits threshold is reached, even though we will
> never end up using this competitiveIterator, so useless work is done here.
> Relates to https://issues.apache.org/jira/browse/LUCENE-9280
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