Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/14842#discussion_r78424378
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SortOrder.scala
---
@@ -21,26 +21,44 @@ import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.catalyst.analysis.TypeCheckResult
import org.apache.spark.sql.catalyst.expressions.codegen.{CodegenContext,
ExprCode}
import org.apache.spark.sql.types._
-import
org.apache.spark.util.collection.unsafe.sort.PrefixComparators.BinaryPrefixComparator
-import
org.apache.spark.util.collection.unsafe.sort.PrefixComparators.DoublePrefixComparator
+import org.apache.spark.util.collection.unsafe.sort.PrefixComparators._
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 = NullsFirst
}
+// default null order is last for desc
--- End diff --
remove
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