Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/13471#discussion_r65613435
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LocalRelation.scala
---
@@ -57,7 +57,13 @@ case class LocalRelation(output: Seq[Attribute], data:
Seq[InternalRow] = Nil)
LocalRelation(output.map(_.newInstance()),
data).asInstanceOf[this.type]
}
- override protected def stringArgs = Iterator(output)
+ override protected def stringArgs: Iterator[Any] = {
+ if (data.isEmpty) {
+ Iterator("Empty", output)
--- End diff --
Good point... How about just "<empty>"? Both "Empty" and "EmptyRelation"
look like some class name, while "<empty>" reads more like an annotation. (This
is pretty subjective though.)
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