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https://issues.apache.org/jira/browse/SOLR-14166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17332840#comment-17332840
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David Smiley commented on SOLR-14166:
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I did a bit of benchmarking. Depending on the scenario, things can be a bit
better (possible a lot) or worse, but never much worse. I filed LUCENE-9938
which may help further. I'll commit this in a couple days.
> Use TwoPhaseIterator for non-cached filter queries
> --------------------------------------------------
>
> Key: SOLR-14166
> URL: https://issues.apache.org/jira/browse/SOLR-14166
> Project: Solr
> Issue Type: Sub-task
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Major
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> "fq" filter queries that have cache=false and which aren't processed as a
> PostFilter (thus either aren't a PostFilter or have a cost < 100) are
> processed in SolrIndexSearcher using a custom Filter thingy which uses a
> cost-ordered series of DocIdSetIterators. This is not TwoPhaseIterator
> aware, and thus the match() method may be called on docs that ideally would
> have been filtered by lower-cost filter queries.
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