[jira] [Created] (CALCITE-2949) Double aggregate generated for in subquery with distinct

["Haisheng Yuan (JIRA)" <ji...@apache.org>]

Haisheng Yuan created CALCITE-2949:
--------------------------------------

             Summary: Double aggregate generated for in subquery with distinct
                 Key: CALCITE-2949
                 URL: https://issues.apache.org/jira/browse/CALCITE-2949
             Project: Calcite
          Issue Type: Bug
          Components: core
            Reporter: Haisheng Yuan


Repro:
Add the following test to SqlToRelConverterTest.java.

{code:java}
@Test public void testSubQueryIN() {
    final String sql = "select deptno\n"
        + "from EMP e\n"
        + "where deptno in (select distinct deptno\n"
        + "from EMP where empno=e.empno)";
    sql(sql).ok();
  }
{code}

Plan:
{code:java}
LogicalProject(DEPTNO=[$7])
  LogicalJoin(condition=[AND(=($0, $10), =($7, $9))], joinType=[inner])
    LogicalTableScan(table=[[CATALOG, SALES, EMP]])
    LogicalAggregate(group=[{0, 1}])
      LogicalProject(DEPTNO=[$0], EMPNO=[$1])
        LogicalAggregate(group=[{0, 1}])
          LogicalProject(DEPTNO=[$7], EMPNO=[$0])
            LogicalTableScan(table=[[CATALOG, SALES, EMP]])
{code}

One LogicalAggregate would suffice. Although the 2 aggregates can be merged by rules described in issue [CALCITE-1172|https://issues.apache.org/jira/browse/CALCITE-1172], which is not available yet.




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