[SPARK-11363] [SQL] LeftSemiJoin should be LeftSemi in SparkStrategies

JIRA: https://issues.apache.org/jira/browse/SPARK-11363

In SparkStrategies some places use LeftSemiJoin. It should be LeftSemi.

cc chenghao-intel liancheng

Author: Liang-Chi Hsieh <viirya@appier.com>

Closes #9318 from viirya/no-left-semi-join.

sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala

@@ -297,11 +297,11 @@ private[sql] abstract class SparkStrategies extends QueryPlanner[SparkPlan] {
   object BroadcastNestedLoop extends Strategy {
     def apply(plan: LogicalPlan): Seq[SparkPlan] = plan match {
       case logical.Join(
-             CanBroadcast(left), right, joinType, condition) if joinType != LeftSemiJoin =>
+             CanBroadcast(left), right, joinType, condition) if joinType != LeftSemi =>
         execution.joins.BroadcastNestedLoopJoin(
           planLater(left), planLater(right), joins.BuildLeft, joinType, condition) :: Nil
       case logical.Join(
-             left, CanBroadcast(right), joinType, condition) if joinType != LeftSemiJoin =>
+             left, CanBroadcast(right), joinType, condition) if joinType != LeftSemi =>
         execution.joins.BroadcastNestedLoopJoin(
           planLater(left), planLater(right), joins.BuildRight, joinType, condition) :: Nil
       case _ => Nil
@@ -311,7 +311,7 @@ private[sql] abstract class SparkStrategies extends QueryPlanner[SparkPlan] {
   object CartesianProduct extends Strategy {
     def apply(plan: LogicalPlan): Seq[SparkPlan] = plan match {
       // TODO CartesianProduct doesn't support the Left Semi Join
-      case logical.Join(left, right, joinType, None) if joinType != LeftSemiJoin =>
+      case logical.Join(left, right, joinType, None) if joinType != LeftSemi =>
         execution.joins.CartesianProduct(planLater(left), planLater(right)) :: Nil
       case logical.Join(left, right, Inner, Some(condition)) =>
         execution.Filter(condition,