twalthr commented on code in PR #27929:
URL: https://github.com/apache/flink/pull/27929#discussion_r3094509899
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flink-table/flink-table-common/src/main/java/org/apache/flink/table/functions/TableSemantics.java:
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@@ -116,4 +127,40 @@ public interface TableSemantics {
* type inference phase as the changelog mode is still unknown.
*/
Optional<ChangelogMode> changelogMode();
+
+ /** The sort direction for ORDER BY columns in table arguments with set
semantics. */
+ @PublicEvolving
+ enum SortDirection {
+ /** Ascending order with nulls first. */
+ ASC_NULLS_FIRST(false, true),
Review Comment:
The timestamp is not nullable. But the interfaces here just reflect SQL
semantics. Even if not specified explicitly, you will get some implicit null
behavior from the engine. And TableSemantics class will reflect this.
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