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[CALCITE-7402] Two-level nested correlated subquery causes TopDownGeneralDecorrelator type mismatch during translation #4780

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Merged
silundong merged 1 commit into from
Jan 30, 2026
+26 −1
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[CALCITE-7402] Two-level nested correlated subquery causes TopDownGeneralDecorrelator type mismatch during translation #4780

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3 changes: 2 additions & 1 deletion core/src/main/java/org/apache/calcite/sql2rel/TopDownGeneralDecorrelator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -931,7 +931,8 @@ static List<RexNode> rewrite(
(RexCorrelVariable) fieldAccess.getReferenceExpr();
CorDef corDef = new CorDef(v.id, fieldAccess.getField().getIndex());
int newIndex = requireNonNull(unnestedQuery.corDefOutputs.get(corDef));
return new RexInputRef(newIndex, fieldAccess.getType());
return new RexInputRef(
newIndex, unnestedQuery.r.getRowType().getFieldList().get(newIndex).getType());
}
return super.visitFieldAccess(fieldAccess);
}
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24 changes: 24 additions & 0 deletions core/src/test/resources/sql/new-decorr.iq
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Expand Up @@ -276,4 +276,28 @@ select deptno from dept d1 where exists (

!ok

# [CALCITE-7402] Two-level nested correlated subquery causes TopDownGeneralDecorrelator type mismatch during translation
# This case comes from sub-query.iq [CALCITE-5716]
!use scott
SELECT dept.deptno, (
SELECT max(emp.empno)
FROM emp
WHERE empno = (SELECT max(empno) AS maxDept
FROM emp e2
WHERE e2.deptno = dept.deptno)
AND emp.deptno = dept.deptno),
dept.dname
FROM dept;
+--------+--------+------------+
| DEPTNO | EXPR$1 | DNAME |
+--------+--------+------------+
| 10 | 7934 | ACCOUNTING |
| 20 | 7902 | RESEARCH |
| 30 | 7900 | SALES |
| 40 | | OPERATIONS |
+--------+--------+------------+
(4 rows)

!ok

# End new-decorr.iq
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