cloud-fan commented on code in PR #40856:
URL: https://github.com/apache/spark/pull/40856#discussion_r1173558023
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/InlineCTE.scala:
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@@ -68,50 +69,91 @@ case class InlineCTE(alwaysInline: Boolean = false) extends
Rule[LogicalPlan] {
cteDef.child.exists(_.expressions.exists(_.isInstanceOf[OuterReference]))
}
+ /**
+ * Accumulates all the CTEs from a plan into a special map.
+ *
+ * @param plan The plan to collect the CTEs from
+ * @param cteMap A mutable map that accumulates the CTEs and their reference
information by CTE
+ * ids. The value of the map is tuple whose elements are:
+ * - The CTE definition
Review Comment:
```suggestion
* - The CTE definition ID
```
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