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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