silundong commented on code in PR #4997:
URL: https://github.com/apache/calcite/pull/4997#discussion_r3378630634
##########
core/src/test/resources/sql/sub-query.iq:
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@@ -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:
It seems this is because the new decorrelator forgot to rewrite the ORDER BY
clause in the window function. Thanks for catching this, I’ll report and fix it.
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