Update Optimizer.scala

Author: pzzs

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

@@ -294,12 +294,10 @@ object ConstantFolding extends Rule[LogicalPlan] {
       case e if e.foldable => Literal.create(e.eval(null), e.dataType)
 
       // Fold "literal in (item1, item2, ..., literal, ...)" into true or false directly.
-      case In(Literal(v, _), list) =>
-        val isExists = list.exists {
-          case Literal(candidate, _) if candidate == v => true
-          case _ => false
-        }
-        if (isExists) Literal.create(true, BooleanType) else Literal.create(false, BooleanType)
+      case InSet(Literal(v, _), hSet) => {
+        val isExists = hSet.contains(v)
+        if(isExists) Literal.create(true, BooleanType) else Literal.create(false, BooleanType)
+      }
     }
   }
 }