Haisheng Yuan created CALCITE-2949:
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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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