jchen5 commented on code in PR #41094:
URL: https://github.com/apache/spark/pull/41094#discussion_r1188683767


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala:
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@@ -367,7 +367,7 @@ case class ListQuery(
     plan.output.head.dataType
   }
   override lazy val resolved: Boolean = childrenResolved && plan.resolved && 
numCols != -1
-  override def nullable: Boolean = false
+  override def nullable: Boolean = childOutputs.exists(_.nullable)

Review Comment:
   Ok, I can try changing it to throw an exception in ListQuery.nullable and 
change InSubquery.nullable to check ListQuery.childOutputs directly.



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