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https://issues.apache.org/jira/browse/CALCITE-2855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16771510#comment-16771510
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godfrey he commented on CALCITE-2855:
-------------------------------------
Not exactly.
A new extended RelMetadataQuery instance will be created each time you use it,
instead get a reusable instance from RelOptCluster#getMetadataQuery. So I need
override RelOptCluster#getMetadataQuery to reduce number of extended
RelMetadataQuery instances.
> 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: 20m
> Remaining Estimate: 0h
>
> Expose RelOptCluster Constructor outside package to allow override.
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