cloud-fan commented on code in PR #50546:
URL: https://github.com/apache/spark/pull/50546#discussion_r2039400525
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveWithCTE.scala:
##########
@@ -83,8 +83,21 @@ object ResolveWithCTE extends Rule[LogicalPlan] {
cteDef.copy(child = alias.copy(child = loop))
}
+ // Simple case of duplicating (UNION ALL) clause, with CTEs
inside.
+ case alias @ SubqueryAlias(_, withCTE @ WithCTE(
+ Union(Seq(anchor, recursion), false, false), _)) =>
+ if (!anchor.resolved) {
+ cteDef
+ } else {
+ val loop = UnionLoop(
+ cteDef.id,
+ anchor,
+ rewriteRecursiveCTERefs(recursion, anchor, cteDef.id,
None))
+ cteDef.copy(child = alias.copy(child = withCTE.copy(plan =
loop)))
+ }
+
// The case of CTE name followed by a parenthesized list of
column name(s), eg.
- // WITH RECURSIVE t(n).
+ // WITH RECURSIVE t(n), with CTEs inside.
Review Comment:
```suggestion
// WITH RECURSIVE t(n).
```
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