remove unnecessary code

Author: jatin510

spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala

@@ -2865,11 +2865,6 @@ object QueryPlanSerde extends Logging with ShimQueryPlanSerde with CometExprShim
           case RightOuter => JoinType.RightOuter
           case FullOuter => JoinType.FullOuter
           case LeftSemi => JoinType.LeftSemi
-          // TODO: DF SMJ with join condition fails TPCH q21
-          case LeftAnti if condition.isEmpty => JoinType.LeftAnti
-          case LeftAnti =>
-            withInfo(join, "LeftAnti SMJ join with condition is not supported")
-            return None
           case _ =>
             // Spark doesn't support other join types
             withInfo(op, s"Unsupported join type ${join.joinType}")