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https://issues.apache.org/jira/browse/LUCENE-9287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17065790#comment-17065790
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Adrien Grand commented on LUCENE-9287:
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The change makes sense to me but I don't understand the benchmark, does it mean
that the query takes 40ms once cached? Or is it the time it takes to cache the
query?
> Never cache DocValuesFieldExistsQuery
> -------------------------------------
>
> Key: LUCENE-9287
> URL: https://issues.apache.org/jira/browse/LUCENE-9287
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Ignacio Vera
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently {{DocValuesFieldExistsQuery}} is cached if there are no DV updates
> on the field in question. This query is pretty efficient and some experiments
> show that caching the result might be much more expensive than the benefits
> we get from caching the result.
> For example, indexing 10 million documents with long values and then
> executing this query:
> * without caching it takes around 1ms to run.
> * with caching it takes around 40ms to run and the size of the cache is
> around 1MB (1212792 bytes).
> I wonder if we should never cache this query as it seems the overhead of
> caching the results is not worthy.
>
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