hvanhovell commented on code in PR #47572:
URL: https://github.com/apache/spark/pull/47572#discussion_r1705482291


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala:
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@@ -342,7 +342,8 @@ case class UnresolvedFunction(
     isDistinct: Boolean,
     filter: Option[Expression] = None,
     ignoreNulls: Boolean = false,
-    orderingWithinGroup: Seq[SortOrder] = Seq.empty)
+    orderingWithinGroup: Seq[SortOrder] = Seq.empty,
+    isInternal: Boolean = false)

Review Comment:
   I think it is fine for two reasons:
   1. It should be very rare to add an internal function. As a 3p extension 
developer you generally want the SQL Dataframe surface to match.
   2. A 3p developer should not really be creating these UnresolvedFunctions. 
This should be done using the Column API, and indirectly through the Spark API.



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