iwanttobepowerful commented on code in PR #4998:
URL: https://github.com/apache/calcite/pull/4998#discussion_r3400289981
##########
core/src/test/resources/sql/sub-query.iq:
##########
@@ -8168,6 +8168,41 @@ SELECT deptno FROM dept WHERE 1000.00 >
!ok
+# [CALCITE-7587] RelDecorrelator fails on correlated scalar subquery with
ROW_NUMBER window function
+# due to RexOver nullability mismatch
+# Correlated scalar sub-query in the SELECT list that contains a window
function.
+# Decorrelation must add the correlation key to the window partition and
preserve nullability
+# of the OVER expression after pulling it above the left correlate.
+SELECT e.ename,
+ (SELECT ROW_NUMBER() OVER (PARTITION BY e.deptno ORDER BY e.empno, d.deptno)
+ FROM dept d
+ WHERE e.deptno = d.deptno) AS rn
+FROM emp e
+ORDER BY e.empno;
+!if (use_old_decorr) {
Review Comment:
let https://github.com/apache/calcite/pull/5014 merge firstly. And then new
decorrelator can return right result.
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