cloud-fan commented on a change in pull request #31580:
URL: https://github.com/apache/spark/pull/31580#discussion_r585660456
##########
File path:
sql/catalyst/src/main/java/org/apache/spark/sql/connector/expressions/SortDirection.java
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@@ -19,14 +19,33 @@
import org.apache.spark.annotation.Experimental;
+import static
org.apache.spark.sql.connector.expressions.NullOrdering.NULLS_FIRST;
+import static
org.apache.spark.sql.connector.expressions.NullOrdering.NULLS_LAST;
+
/**
* A sort direction used in sorting expressions.
+ * <p>
+ * Each direction has a default null ordering that is implied if no null
ordering is specified
+ * explicitly.
*
* @since 3.2.0
*/
@Experimental
public enum SortDirection {
- ASCENDING, DESCENDING;
+ ASCENDING(NULLS_FIRST), DESCENDING(NULLS_LAST);
+
+ private final NullOrdering defaultNullOrdering;
+
+ SortDirection(NullOrdering defaultNullOrdering) {
+ this.defaultNullOrdering = defaultNullOrdering;
+ }
+
+ /**
+ * Returns the default null ordering to use if no null ordering is specified
explicitly.
+ */
+ public NullOrdering defaultNullOrdering() {
Review comment:
@HeartSaVioR `SortOrder` is not an API we ask users to implement. The
users should call `Expressions.sort` to create an instance of `SortOrder`.
That's why I suggested adding an overload of `Expressions.sort`, as that
makes null ordering optional to the users.
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