Github user cloud-fan commented on a diff in the pull request:
    --- Diff: 
    @@ -100,7 +100,7 @@ case class NaturalJoin(tpe: JoinType) extends JoinType {
       override def sql: String = "NATURAL " + tpe.sql
    -case class UsingJoin(tpe: JoinType, usingColumns: 
Seq[UnresolvedAttribute]) extends JoinType {
    --- End diff --
    the USING column can never has a qualifier, or be a nested field, we don't 
need to use `UnresolvedAttribute` here.

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