cloud-fan commented on a change in pull request #32470:
URL: https://github.com/apache/spark/pull/32470#discussion_r651629291
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
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@@ -652,3 +652,15 @@ case object UnresolvedSeed extends LeafExpression with
Unevaluable {
override def dataType: DataType = throw new UnresolvedException("dataType")
override lazy val resolved = false
}
+
+/**
+ * An intermediate expression to hold a resolved (nested) column. Some rules
may need to undo the
+ * column resolution and use this expression to keep the original column name.
+ */
+case class TempResolvedColumn(child: Expression, nameParts: Seq[String])
extends UnaryExpression
Review comment:
Actually, we don't require it to be a named expression, so it's more
robust to keep the type as `Expression`.
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