MaxGekk commented on a change in pull request #28328:
URL: https://github.com/apache/spark/pull/28328#discussion_r414566719



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
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@@ -519,7 +519,9 @@ case class InSet(child: Expression, hset: Set[Any]) extends 
UnaryExpression with
 
   override def sql: String = {
     val valueSQL = child.sql
-    val listSQL = hset.toSeq.map(Literal(_).sql).mkString(", ")

Review comment:
       It doesn't accept UTF8String at 
https://github.com/apache/spark/blob/ff39c9271ca04951b045c5d9fca2128a82d50b46/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/literals.scala#L292




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