Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/9055#discussion_r42581804
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
---
@@ -263,3 +263,50 @@ case class UnresolvedAlias(child: Expression)
override lazy val resolved = false
}
+
+trait SubQueryExpression extends Unevaluable {
+ def subquery: LogicalPlan
+
+ override def dataType: DataType = BooleanType
+ override def foldable: Boolean = false
+ override def nullable: Boolean = false
+
+ def withNewSubQuery(newSubquery: LogicalPlan): this.type
+}
+
+/**
+ * Exist subquery expression, only used in filter only
+ */
+case class Exists(subquery: LogicalPlan, positive: Boolean)
--- End diff --
Looks like `positive` does not clearly explain the meaning.
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