Github user xwu0226 commented on a diff in the pull request:
https://github.com/apache/spark/pull/14842#discussion_r77076122
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SortOrder.scala
---
@@ -28,14 +28,24 @@ abstract sealed class SortDirection {
def sql: String
}
+// default null order is firt for asc
case object Ascending extends SortDirection {
override def sql: String = "ASC"
}
+case object AscendingNullLast extends SortDirection {
--- End diff --
Thanks! I think this could work.
```
case class SortOrder(child: Expression, direction: SortDirection,
nullOrdering: NullOrdering) {
...
}
object SortOrder {
def apply(child: Expression, direction: SortDirection): SortOrder = {
new SortOrder(child, direction, direction.defaultNullOrdering)
}
}
```
Let me run the test and see.
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