Mayya Sharipova created LUCENE-10224:
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Summary: 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
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
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