Github user hvanhovell commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16954#discussion_r105780845
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
 ---
    @@ -40,19 +43,189 @@ abstract class PlanExpression[T <: QueryPlan[_]] 
extends Expression {
     /**
      * A base interface for expressions that contain a [[LogicalPlan]].
      */
    -abstract class SubqueryExpression extends PlanExpression[LogicalPlan] {
    +abstract class SubqueryExpression(
    +    plan: LogicalPlan,
    +    children: Seq[Expression],
    +    exprId: ExprId) extends PlanExpression[LogicalPlan] {
    +
    +  override lazy val resolved: Boolean = childrenResolved && plan.resolved
    +  override lazy val references: AttributeSet =
    +    if (plan.resolved) super.references -- plan.outputSet else 
super.references
       override def withNewPlan(plan: LogicalPlan): SubqueryExpression
    +  override def semanticEquals(o: Expression): Boolean = o match {
    +    case p: SubqueryExpression =>
    +      this.getClass.getName.equals(p.getClass.getName) && 
plan.sameResult(p.plan) &&
    +        children.length == p.children.length &&
    +        children.zip(p.children).forall(p => p._1.semanticEquals(p._2))
    +    case _ => false
    +  }
     }
     
     object SubqueryExpression {
    +  /**
    +   * Returns true when an expression contains an IN or EXISTS subquery and 
false otherwise.
    +   */
    +  def hasInOrExistsSubquery(e: Expression): Boolean = {
    +    e.find {
    +      case _: ListQuery | _: Exists => true
    +      case _ => false
    +    }.isDefined
    +  }
    +
    +  /**
    +   * Returns true when an expression contains a subquery that has outer 
reference(s). The outer
    +   * reference attributes are kept as children of subquery expression by
    +   * [[org.apache.spark.sql.catalyst.analysis.Analyzer.ResolveSubquery]]
    +   */
       def hasCorrelatedSubquery(e: Expression): Boolean = {
         e.find {
    -      case e: SubqueryExpression if e.children.nonEmpty => true
    +      case s: SubqueryExpression => s.children.nonEmpty
           case _ => false
         }.isDefined
       }
     }
     
    +object SubExprUtils extends PredicateHelper {
    --- End diff --
    
    Ok, so the the `SubExprUtils` should be moved to the `OuterReference` 
companion :)...
    
    Let's leave it for now.


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