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_r345585182
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/subquery.scala
##########
@@ -171,6 +173,57 @@ case class InSubqueryExec(
}
}
+/**
+ * The physical node of non-correlated EXISTS subquery.
+ */
+case class ExistsExec(
+ plan: BaseSubqueryExec,
+ exprId: ExprId)
+ extends ExecSubqueryExpression {
+
+ @transient private var result: Boolean = _
+
+ 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 = plan.executeTake(1).length == 1
+ }
+
+ def values(): Option[Boolean] = Option(result)
+
+ override def eval(input: InternalRow): Any = {
+ result
+ }
+
+ override lazy val canonicalized: ExistsExec = {
+ copy(
+ plan = plan.canonicalized.asInstanceOf[BaseSubqueryExec],
+ exprId = ExprId(0))
+ }
+
+ override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
Review comment:
> again, can we follow `org.apache.spark.sql.execution.ScalarSubquery`? The
codegen is well implemented there.
Done
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