AngersZhuuuu commented on a change in pull request #26437: [SPARK-29800][SQL] 
Plan Exists 's subquery in PlanSubqueries
URL: https://github.com/apache/spark/pull/26437#discussion_r344443599
 
 

 ##########
 File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/subquery.scala
 ##########
 @@ -171,6 +171,63 @@ case class InSubqueryExec(
   }
 }
 
+/**
+ * The physical node of exists-subquery. This is for support use exists in 
join's on condition,
+ * since some join type we can't pushdown exists condition, we plan it here
+ */
+case class ExistsExec(child: Expression,
+                      subQuery: String,
+                      plan: BaseSubqueryExec,
+                      exprId: ExprId,
+                      private var resultBroadcast: Broadcast[Boolean] = null)
+  extends ExecSubqueryExpression {
+
+  @transient private var result: Boolean = _
+
+  override def dataType: DataType = BooleanType
+  override def children: Seq[Expression] = child :: Nil
+  override def nullable: Boolean = child.nullable
+  override def toString: String = s"EXISTS ${plan.name}"
+  override def withNewPlan(plan: BaseSubqueryExec): ExistsExec = copy(plan = 
plan)
+
+  override def semanticEquals(other: Expression): Boolean = other match {
+    case in: ExistsExec => child.semanticEquals(in.child) && 
plan.sameResult(in.plan)
+    case _ => false
+  }
+
+
+  def updateResult(): Unit = {
+    result = !plan.execute().isEmpty()
 
 Review comment:
   > Yeah, we need to change RewritePredicateSubquery which handles correlated 
subquery rewrites. The only thing i am not sure is about the outer joins.
   
   Yes, outer join is complex, if we do this, we need to add end to end test 
case cover each case to make sure the final plans are as expected.

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