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[jira] [Created] (CALCITE-2647) In RelBuilder, add a groupKey method that assumes only one grouping set


Julian Hyde created CALCITE-2647:
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             Summary: 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


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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