Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/12087#discussion_r58412559
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/objects.scala ---
@@ -68,6 +71,69 @@ case class MapPartitions(
}
/**
+ * Applies the given function to each input row and encodes the result.
+ *
+ * TODO: Each serializer expression needs the result object which is
returned by the given function,
--- End diff --
I would soften this. Its not clear that removing this small amount of code
duplication is worth the confusion that would result in showing the
un-common-subexpression-eliminated version of a project in the explain.
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