Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22788#discussion_r227202767 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala --- @@ -99,7 +99,7 @@ case class UnresolvedTableValuedFunction( case class UnresolvedAttribute(nameParts: Seq[String]) extends Attribute with Unevaluable { def name: String = - nameParts.map(n => if (n.contains(".")) s"`$n`" else n).mkString(".") + nameParts.map(n => if (nameParts.length > 1 || n.contains(".")) s"`$n`" else n).mkString(".") --- End diff -- I don't think this is better for `name`, we should update `sql` though.
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