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https://issues.apache.org/jira/browse/LUCENE-8950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16907090#comment-16907090
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Adrien Grand commented on LUCENE-8950:
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OK I got confused with the notion of deprecation, which suggests to me that we
need to find a replacement, but reading your last message, my understanding is
that you would like to introduce a sub class of FieldComparator that hides the
fact that it maintains an implicit PQ, and make simple comparators extend this
sub class instead of FieldComparator directly? I would be +1 to giving it a try
and making the change if the perf hit is negligible.
> FieldComparators Should Not Maintain Implicit PQs
> -------------------------------------------------
>
> Key: LUCENE-8950
> URL: https://issues.apache.org/jira/browse/LUCENE-8950
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Atri Sharma
> Priority: Major
>
> While doing some perf tests, I realised that FieldComparators inherently
> maintain implicit priority queues for maintaining the sorted order of
> documents for the given sort order. This is wasteful especially in the case
> of a multi feature sort order and a large number of hits requested.
>
> We should change this to have FieldComparators maintain only the top and
> bottom values, and use them as barriers to compare
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