Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17185#discussion_r208073035
--- 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 --
nit: `val qualifierPrefix = qualifier.mkString("", ".", ".")`
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