Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/11316#discussion_r53726965
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LocalRelation.scala
---
@@ -45,6 +45,9 @@ object LocalRelation {
case class LocalRelation(output: Seq[Attribute], data: Seq[InternalRow] =
Nil)
extends LeafNode with analysis.MultiInstanceRelation {
+ // A local relation must have resolved output.
+ require(output.forall(_.resolved), "Unresolved attributes found when
constructing LocalRelation.")
--- End diff --
The reported error was `cannot resolve 'i' given input columns: []` which
is pretty confusing since every node in the plan does actually have `output`.
The reason for this error was we were constructing a `LocalRelation` that
itself was unresolved. Since this isn't a valid plan, I added this check to
force an earlier failure.
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