Ruben Q L created CALCITE-3539:
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Summary: EnumerableDefaults#nestedLoopJoin returns duplicates for
JoinType.SEMI
Key: CALCITE-3539
URL: https://issues.apache.org/jira/browse/CALCITE-3539
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.21.0
Reporter: Ruben Q L
Assignee: Ruben Q L
Fix For: 1.22.0
The issue can be reproduced by adding the following test to
EnumerablesTest.java:
{code:java}
@Test public void testNestedLoopSemiJoin() {
assertThat(
EnumerableDefaults.nestedLoopJoin(DEPTS, EMPS, (d, e) -> d.deptno ==
e.deptno,
(d, e) -> d.toString(), JoinType.SEMI).toList().toString(),
equalTo("[Dept(20, Sales)]"));
}
{code}
This test performs a "DEPT semi-join EMP" (i.e. select all departments which
have at least one employee):
{code:java}
SELECT * FROM DEPT
WHERE EXISTS (SELECT 1 FROM EMP
WHERE DEPT.DEPTNO = EMP.DEPTNO)
{code}
This semi-join query must not return duplicates, however out test returns:
{code:java}
Expected: "[Dept(20, Sales)]"
but: was "[Dept(20, Sales), Dept(20, Sales)]"
{code}
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