Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/11050#discussion_r55914448
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
---
@@ -174,7 +184,8 @@ case class Alias(child: Expression, name: String)(
override def sql: String = {
val qualifiersString =
if (qualifiers.isEmpty) "" else qualifiers.map("`" + _ +
"`").mkString("", ".", ".")
- s"${child.sql} AS $qualifiersString`$name`"
+ val aliasName = if (isGenerated) s"$name#${exprId.id}" else s"$name"
--- End diff --
ah, I see. This is to workaround an issue in SQLBuilder
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