Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/11274#discussion_r55294609
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/basicOperators.scala ---
@@ -39,15 +39,26 @@ case class Project(projectList: Seq[NamedExpression],
child: SparkPlan)
child.asInstanceOf[CodegenSupport].produce(ctx, this)
}
+ override def usedInputs: AttributeSet = {
--- End diff --
As discussed offline, this is need to handle the cases that an Attribute
could appear twice in `projectList`, but we can't generate the code for an
Attribute twice.
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