AngersZhuuuu commented on a change in pull request #26437: [SPARK-29800][SQL]
Plan non-correlated Exists 's subquery in PlanSubqueries
URL: https://github.com/apache/spark/pull/26437#discussion_r345621559
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/subquery.scala
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@@ -171,6 +172,44 @@ case class InSubqueryExec(
}
}
+/**
+ * The physical node of non-correlated EXISTS subquery.
+ */
+case class ExistsExec(
+ plan: BaseSubqueryExec,
+ exprId: ExprId)
+ extends ExecSubqueryExpression {
+
+ @volatile private var result: Option[Boolean] = None
+
+ override def dataType: DataType = BooleanType
+ override def children: Seq[Expression] = Nil
+ override def nullable: Boolean = false
+ override def toString: String = s"EXISTS
(${plan.simpleString(SQLConf.get.maxToStringFields)})"
+ override def withNewPlan(plan: BaseSubqueryExec): ExistsExec = copy(plan =
plan)
+
+ override def semanticEquals(other: Expression): Boolean = other match {
+ case in: ExistsExec => plan.sameResult(in.plan)
+ case _ => false
+ }
+
+ def updateResult(): Unit = {
+ result = Some(plan.executeTake(1).length == 1)
+ }
+
+ def values(): Option[Boolean] = result
+
+ override def eval(input: InternalRow): Any = {
+ require(result.isDefined, s"$this has not finished")
+ result
Review comment:
> should be `result.get`
Yea..updated.
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