Haisheng Yuan created CALCITE-3403:

             Summary: WindowReduceExpressionsRule does not reuse 
                 Key: CALCITE-3403
                 URL: https://issues.apache.org/jira/browse/CALCITE-3403
             Project: Calcite
          Issue Type: Improvement
            Reporter: Haisheng Yuan

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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