peter-toth commented on a change in pull request #31573:
URL: https://github.com/apache/spark/pull/31573#discussion_r576989349
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
##########
@@ -85,6 +85,26 @@ object SubqueryExpression {
}.isDefined
}
+ /**
+ * Returns true when an expression contains a scalar subquery
+ */
+ def hasScalarSubquery(e: Expression): Boolean = {
+ e.find {
+ case _: ScalarSubquery => true
+ case _ => false
+ }.isDefined
+ }
+
+ /**
+ * Returns true when an expression contains a non-scalar subquery
+ */
+ def hasNonScalarSubquery(e: Expression): Boolean = {
+ e.find {
+ case s: SubqueryExpression if !hasScalarSubquery(s) => true
Review comment:
how about `case s: SubqueryExpression =>
!s.isInstanceOf[ScalarSubquery]` and we probably don't need `def
hasScalarSubquery()` at all?
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