francis0407 commented on a change in pull request #23783: [SPARK-26854][SQL] 
Support ANY/SOME subquery
URL: https://github.com/apache/spark/pull/23783#discussion_r258395446
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
 ##########
 @@ -145,11 +145,14 @@ case class Not(child: Expression)
   override def sql: String = s"(NOT ${child.sql})"
 }
 
-/**
- * Evaluates to `true` if `values` are returned in `query`'s result set.
- */
-case class InSubquery(values: Seq[Expression], query: ListQuery)
-  extends Predicate with Unevaluable {
+abstract class PredicateSubquery extends BinaryExpression with Predicate with 
Unevaluable {
 
 Review comment:
   Besides, using `BinaryExpression` here may cause errors when analyze query. 
It will throw an exception before the rule `ResolveSubquery`. I'll revert this.

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