cloud-fan commented on a change in pull request #32298:
URL: https://github.com/apache/spark/pull/32298#discussion_r627429191
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
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@@ -267,6 +268,33 @@ object ScalarSubquery {
}
}
+/**
+ * A subquery that is capable to return multiple scalar values.
+ */
+case class MultiScalarSubquery(
Review comment:
Do we have to create a new subquery expression? It seems like we can
just use `CreateNamedStruct` in `ScalarSubquery.plan`
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