Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/12306#discussion_r59288009
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
---
@@ -77,3 +77,24 @@ case class ScalarSubquery(
override def toString: String = s"subquery#${exprId.id}"
}
+
+/**
+ * Base interface for correlated subquery expressions.
+ */
+abstract class CorrelatedSubqueryExpression extends SubqueryExpression{
+ override lazy val resolved: Boolean = false // can't be resolved
+ override def plan: LogicalPlan = SubqueryAlias(toString, query)
+}
+
+case class InSubQuery(query: LogicalPlan) extends
CorrelatedSubqueryExpression with Unevaluable {
+ override def dataType: DataType = ArrayType(NullType)
+ override def nullable: Boolean = true
+ override def withNewPlan(plan: LogicalPlan): InSubQuery =
InSubQuery(plan)
+}
+
+case class Exists(
--- End diff --
style nit
```
case class Exists(query: LogicalPlan)
extends CorrelatedSubqueryExpression with Unevaluable with Predicate {
```
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