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https://issues.apache.org/jira/browse/LUCENE-7050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15171651#comment-15171651
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Adrien Grand commented on LUCENE-7050:
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bq. What about eg reordering clauses for more efficiency and other potential
uses? [...] it would be cleaner for queries to confess that processing just a
few docs is just as costly as processing all docs.
I opened LUCENE-7055.
> Improve the query cache heuristic to detect costly queries
> ----------------------------------------------------------
>
> Key: LUCENE-7050
> URL: https://issues.apache.org/jira/browse/LUCENE-7050
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-7050.patch
>
>
> Term queries, phrase queries and their combinations through boolean queries
> should not be cached too agressively since they can efficiently make use of
> skip lists. However we also have a number of queries that in practice need to
> visit all matches anyway like PrefixQuery, TermsQuery, PointInSetQuery,
> PointRangeQuery, so caching them more agressively can help avoid computing
> all documents that match in the whole index again and again.
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