iwanttobepowerful commented on code in PR #4997:
URL: https://github.com/apache/calcite/pull/4997#discussion_r3370821584
##########
core/src/test/resources/sql/sub-query.iq:
##########
@@ -8168,6 +8168,578 @@ SELECT deptno FROM dept WHERE 1000.00 >
!ok
+# [CALCITE-7584] RelDecorrelator produces incorrect results for correlated
LATERAL sub-queries with window functions
+# Correlated LATERAL sub-query with a window expression.
+# The equality predicate between the inner and outer query must remain applied
+# after decorrelation.
+SELECT e.ename, d.deptno, d.m
+FROM emp e
+JOIN LATERAL (
+ SELECT d.deptno,
+ MAX(d.deptno + e.empno) OVER (PARTITION BY e.deptno) AS m
+ FROM dept d
+ WHERE e.deptno = d.deptno
+) d ON TRUE
+ORDER BY e.empno;
+!if (use_old_decorr) {
Review Comment:
```sql
SELECT e.ename, d.deptno, d.rn
FROM emp e
JOIN LATERAL (
SELECT d.deptno,
ROW_NUMBER() OVER (PARTITION BY e.deptno ORDER BY e.empno, d.deptno) AS
rn
FROM dept d
WHERE e.deptno = d.deptno
) d ON TRUE
ORDER BY e.empno;
```
and
```sql
SELECT 1
FROM calcite_7584_t1 t1
WHERE t1b = (SELECT MAX(tmp.s) FROM (
SELECT SUM(t2c) OVER (PARTITION BY t2c ORDER BY t1.t1d + t2d)
AS s
FROM calcite_7584_t2 t2) AS tmp);
```
failed in TOPDOWN_GENERAL_DECORRELATION
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