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  1. Calcite
  2. CALCITE-1558

AggregateExpandDistinctAggregatesRule gets field mapping wrong if groupKey is used in aggregate function

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.12.0
    • Component/s: None
    • Labels:
      None

      Description

      In AggregateExpandDistinctAggregatesRule.convertSingletonDistinct,
      if the groupKey is also used in some aggregate function,
      the field mapping of top level aggregate would be messy.
      Bad cases are:

              // Equivalent SQL:
              //   SELECT deptno, COUNT(deptno), SUM(DISTINCT sal)
              //   FROM emp
              //   GROUP BY deptno
      
              //   SELECT deptno, SUM(cnt), SUM(sal)
              //   FROM
              //     SELECT deptno, COUNT(deptno) AS cnt, sal
              //     FROM emp
              //     GROUP BY deptno, sal
              //   GROUP BY deptno
      

      or a more complex case:

              // Equivalent SQL:
              //   SELECT deptno, SUM(deptno), SUM(DISTINCT sal), MAX(deptno), MAX(comm)
              //   FROM emp
              //   GROUP BY deptno
      
              //   SELECT deptno, SUM(sumOfInnerComm), SUM(sal), MAX(maxOfInnerDeptno), MAX(maxOfInnerComm)
              //   FROM
              //     SELECT deptno, sal, SUM(deptno) as sumOfInnerDeptno, MAX(deptno) as maxOfInnerDeptno, MAX(comm) AS maxOfInnerComm
              //     FROM emp
              //     GROUP BY deptno, sal
              //   GROUP BY deptno
      

      I have fixed these cases, and will provide a patch later after more tests.

        Attachments

        1. patch_1558.v1
          8 kB
          Zhenghua Gao

          Activity

            People

            • Assignee:
              julianhyde Julian Hyde
              Reporter:
              docete Zhenghua Gao
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              Dates

              • Created:
                Updated:
                Resolved: