Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/10852#discussion_r50767337
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/object.scala
---
@@ -30,6 +30,15 @@ trait ObjectOperator extends LogicalPlan {
/** The serializer that is used to produce the output of this operator.
*/
def serializer: Seq[NamedExpression]
+ override def output: Seq[Attribute] = serializer.map(_.toAttribute)
+
+ /**
+ * An [[ObjectOperator]] may have one or more deserializers to convert
internal rows to objects.
+ * For each deserializer, [[ObjectOperator]] should also provide the
attributes that can resolve
+ * this deserializer.
--- End diff --
"An [[ObjectOperator]] must also provide the attributes that are available
during the resolution of each deserializer."
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