Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/17185#discussion_r208079335 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala --- @@ -201,7 +204,7 @@ case class Alias(child: Expression, name: String)( } override def sql: String = { - val qualifierPrefix = qualifier.map(_ + ".").getOrElse("") + val qualifierPrefix = if (qualifier.nonEmpty) qualifier.mkString(".") + "." else "" --- End diff -- ah my bad, I thought it would return empty string for empty seq. Let's leave it.
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