Github user yhuai commented on a diff in the pull request: https://github.com/apache/spark/pull/11820#discussion_r56691329 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala --- @@ -183,8 +183,7 @@ case class Alias(child: Expression, name: String)( } override def sql: String = { - val qualifiersString = - if (qualifiers.isEmpty) "" else qualifiers.map(quoteIdentifier).mkString("", ".", ".") + val qualifiersString = if (qualifiers.isEmpty) "" else qualifiers.head + "." --- End diff -- Can we comment on why we need to just get `head`?
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