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https://issues.apache.org/jira/browse/CALCITE-907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16837104#comment-16837104
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Chunwei Lei commented on CALCITE-907:
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[~julianhyde], do we still need this rule? If yes, I would like to implement it.
> Add AggregateExchangeTransposeRule
> ----------------------------------
>
> Key: CALCITE-907
> URL: https://issues.apache.org/jira/browse/CALCITE-907
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Priority: Major
>
> A rule that would recognize an Aggregate on top of an Exchange and push down
> the aggregation. The result is a local Aggregate followed by an Exchange
> followed by a summarizing Aggregate.
> It would exploit SqlSplittableAggFunction, similar to CALCITE-751.
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