Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/14842#discussion_r77141646
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SortOrder.scala
---
@@ -26,21 +26,40 @@ import
org.apache.spark.util.collection.unsafe.sort.PrefixComparators.DoublePref
abstract sealed class SortDirection {
def sql: String
+ def defaultNullOrdering: NullOrdering
+}
+
+abstract sealed class NullOrdering {
+ def sql: String
}
case object Ascending extends SortDirection {
override def sql: String = "ASC"
+ override def defaultNullOrdering: NullOrdering = NullFirst
}
+// default null order is last for desc
case object Descending extends SortDirection {
override def sql: String = "DESC"
+ override def defaultNullOrdering: NullOrdering = NullLast
+}
+
+case object NullFirst extends NullOrdering{
+ override def sql: String = "NULLS FIRST"
+}
+
+case object NullLast extends NullOrdering{
+ override def sql: String = "NULLS LAST"
}
/**
* An expression that can be used to sort a tuple. This class extends
expression primarily so that
* transformations over expression will descend into its child.
*/
-case class SortOrder(child: Expression, direction: SortDirection)
+case class SortOrder(
--- End diff --
Update the sql and toString methods.
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