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https://issues.apache.org/jira/browse/CALCITE-2855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16772825#comment-16772825
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Stamatis Zampetakis commented on CALCITE-2855:
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I was referring to the cache inside RelOptCluster. It seems that a
RelMetadataQuery instance is reused as long as there are no rules applied on
some node in the same cluster. If I understand well you want to be able to
reuse a RelMetadataQuery object more than this but I don't know if this is
safe. Have you checked CALCITE-1812?
> Make RelOptCluster constructor public
> -------------------------------------
>
> Key: CALCITE-2855
> URL: https://issues.apache.org/jira/browse/CALCITE-2855
> Project: Calcite
> Issue Type: Improvement
> Reporter: godfrey he
> Assignee: Julian Hyde
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.19.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Expose RelOptCluster Constructor outside package to allow override.
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