Update Optimizer.scala

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala

@@ -292,16 +292,8 @@ object ConstantFolding extends Rule[LogicalPlan] {
 
       // Fold expressions that are foldable.
       case e if e.foldable => Literal.create(e.eval(null), e.dataType)
-
-      // Fold "literal in (item1, item2, ..., literal, ...)" into true or false directly when all
-      // elements is literal.
-      case InSet(Literal(v, _), hSet) => {
-        val isExists = hSet.contains(v)
-        if(isExists) Literal.create(true, BooleanType) else Literal.create(false, BooleanType)
-      }
 
-      // Fold "literal in (item1, item2, ..., literal, ...)" into true directly when 
-      // not all elements is literal.
+      // Fold "literal in (item1, item2, ..., literal, ...)" into true directly.
       case In(Literal(v, _), list) if list.exists {
           case Literal(candidate, _) if candidate == v => true
           case _ => false