cloud-fan commented on code in PR #49571:
URL: https://github.com/apache/spark/pull/49571#discussion_r1922482014
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/InlineCTE.scala:
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@@ -61,7 +61,8 @@ case class InlineCTE(
// 1) It is fine to inline a CTE if it references another CTE that is
non-deterministic;
// 2) Any `CTERelationRef` that contains `OuterReference` would have been
inlined first.
refCount == 1 ||
- cteDef.deterministic ||
+ // Don't inline recursive CTEs if not necessary as recursion is very
costly.
Review Comment:
is it really for perf? Semantically we can't inline recursive CTE as we must
run it, right?
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