Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20827#discussion_r175881819
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -288,6 +288,7 @@ trait NonSQLExpression extends Expression {
final override def sql: String = {
transform {
case a: Attribute => new PrettyAttribute(a)
+ case a: Alias => PrettyAttribute(a.sql, a.dataType)
--- End diff --
my argument is, `Alias` is not an attribute, but here we turn alias into a
special attribute for display. So I think this is corrected.
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