HyukjinKwon commented on code in PR #47164:
URL: https://github.com/apache/spark/pull/47164#discussion_r1695312108


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ScalaUDF.scala:
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@@ -58,6 +58,8 @@ case class ScalaUDF(
 
   override lazy val deterministic: Boolean = udfDeterministic && 
children.forall(_.deterministic)
 
+  override lazy val foldable: Boolean = deterministic && 
children.forall(_.foldable)

Review Comment:
   Or, if the UDF runs something very heavy, it will stop the Catalyst 
optimizer.



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