Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/5082#discussion_r26914668
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala
---
@@ -191,6 +191,8 @@ case class Expand(
val sizeInBytes = child.statistics.sizeInBytes * projections.length
Statistics(sizeInBytes = sizeInBytes)
}
+
+ override def missingInput = super.missingInput.filter(_.name !=
VirtualColumn.groupingIdName)
--- End diff --
My point is we may also support other virtual columns like
`INPUT__FILE__NAME` and `BLOCK__OFFSET__INSIDE__FILE` in the future. These
virtual columns can be used in more general places like `Project` and `Filter`.
That's why I think moving this to `QueryPlan` may make more sense.
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