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https://issues.apache.org/jira/browse/CALCITE-461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14286678#comment-14286678
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Julian Hyde commented on CALCITE-461:
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Alright, in those cases add a comment on the rule for why they simply cannot
work if there are grouping sets and therefore need IS_SIMPLE as a
side-condition.
> Convert more planner rules to handle grouping sets
> --------------------------------------------------
>
> Key: CALCITE-461
> URL: https://issues.apache.org/jira/browse/CALCITE-461
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Jesus Camacho Rodriguez
>
> Very few planner rules can handle non-simple Aggregates.
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