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https://issues.apache.org/jira/browse/CALCITE-4257?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Starr closed CALCITE-4257.
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Resolution: Won't Fix
CachingRelMetadataProvider is currently being phased out(deprecated?).
> Improve CachingRelMetadataProvider
> ----------------------------------
>
> Key: CALCITE-4257
> URL: https://issues.apache.org/jira/browse/CALCITE-4257
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: James Starr
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> CachingRelMetadataProvider.cached should be parametrizable to allow for usage
> of LRU or soft reference maps. Furthermore, a mechanism should be added to
> prevent RelNode from being cached. Finally, trivial calls should not be
> cached, because it likely as expensive to cache them as it is just perform
> them again.
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