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[jira] [Created] (CALCITE-2757) DISTINCT not being handled correctly in RelToSqlConverter


KrishnaKant Agrawal created CALCITE-2757:
--------------------------------------------

             Summary: DISTINCT not being handled correctly in RelToSqlConverter
                 Key: CALCITE-2757
                 URL: https://issues.apache.org/jira/browse/CALCITE-2757
             Project: Calcite
          Issue Type: Bug
          Components: core
            Reporter: KrishnaKant Agrawal
            Assignee: Julian Hyde


  SELECT DISTINCT sum(x) OVER (PARTITION BY y) FROM t

is valid (per SQL standard) but

  SELECT sum(x) OVER (PARTITION BY y)
  FROM t
  GROUP BY sum(x) OVER (PARTITION BY y)

is not. For example, given the query

  select sum(deptno) over (partition by loc)
  from dept
  group by  sum(deptno) over (partition by loc);

Oracle gives

  ORA-00934: group function is not allowed here

Therefore we should generate a sub-query, something like this:

  SELECT c1
  FROM (
    SELECT sum(deptno) OVER (PARTITION BY loc)
    FROM dept) AS t
  GROUP BY c1;



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