Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/4602#discussion_r28303497
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
---
@@ -112,6 +112,8 @@ case class Alias(child: Expression, name: String)(
extends NamedExpression with trees.UnaryNode[Expression] {
override type EvaluatedType = Any
+ // Alias(Generator, xx) need to be transformed into Generate(generator,
...)
+ override lazy val resolved = childrenResolved &&
!child.isInstanceOf[Generator]
--- End diff --
@marmbrus sorry, I am not so sure your mean, most of change that I made is
move the `aliases` from `Generator` to `Generate`, which means `Generator`
developers will not cares about the aliases any more.
The `Alias(Generator, xx)` here will be transformed to `Generate(generator,
aliases)`, that's why I marked it as `unresolved` for Alias.
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