Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/12067#discussion_r58413353
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
---
@@ -307,3 +307,17 @@ case class UnresolvedAlias(child: Expression,
aliasName: Option[String] = None)
override lazy val resolved = false
}
+
+/**
+ * Holds the deserializer expression and the attributes that are available
during the resolution of
+ * this deserializer expression.
--- End diff --
I don't understand this comment. Maybe give an example?
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