Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/4904#discussion_r25947236
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala
---
@@ -152,6 +153,18 @@ case class Sort(
global: Boolean,
child: LogicalPlan) extends UnaryNode {
override def output = child.output
+
+ override def resolveChildren(name: String, resolver: Resolver) = {
+ val input = child match {
+ case Project(list, c) => list.filter {
+ case Alias(g: GetField, _) => false
+ case Alias(g: GetItem, _) => false
--- End diff --
Can we just filter out everything except `AttributeReference`? I don't know
all corner cases of `ORDER BY` and feel this way is safer.
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