Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9630#discussion_r44566660
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -381,6 +383,16 @@ class Dataset[T] private[sql](
new Dataset(sqlContext, execution, ExpressionEncoder.tuple(encoders))
}
+ private def withEncoder(c: TypedColumn[_, _]): TypedColumn[_, _] = {
--- End diff --
Perhaps this should live in `TypedColumn` itself so we don't have to
duplicate the logic.
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