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https://issues.apache.org/jira/browse/CALCITE-3403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16952341#comment-16952341
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Julian Hyde commented on CALCITE-3403:
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Sorry, I have to grumble about this change.
Most of the changes in this PR are in deprecated methods, and you changed it to
call a method that is semi-deprecated ("This method might be changed or moved
in future.").
> WindowReduceExpressionsRule does not reuse RelMetadataQuery
> -----------------------------------------------------------
>
> Key: CALCITE-3403
> URL: https://issues.apache.org/jira/browse/CALCITE-3403
> Project: Calcite
> Issue Type: Improvement
> Reporter: Haisheng Yuan
> Assignee: jin xing
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.22.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> It creates a new RelMetadataQuery instance, which is a fresh RelMetadataQuery
> without any data cache. We should get RelMetadataQuery from RelOptRuleCall to
> reuse cache as much as possible.
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