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https://issues.apache.org/jira/browse/CALCITE-2647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16668215#comment-16668215
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Yuzhao Chen commented on CALCITE-2647:
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This sounds great, can i make some contribution ?
> In RelBuilder, add a groupKey method that assumes only one grouping set
> -----------------------------------------------------------------------
>
> Key: CALCITE-2647
> URL: https://issues.apache.org/jira/browse/CALCITE-2647
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
>
> In RelBuilder, add a groupKey method that assumes only one grouping set.
> Since this is the most common case (GROUP BY in SQL, without GROUPING SETS or
> ROLLUP or CUBE) it will make many uses of the RelBuilder API more concise.
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