snuyanzin commented on code in PR #27929:
URL: https://github.com/apache/flink/pull/27929#discussion_r3081108934
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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 +128,39 @@ public interface TableSemantics {
* type inference phase as the changelog mode is still unknown.
*/
Optional<ChangelogMode> changelogMode();
+
+ /** Sort direction for ORDER BY columns in table arguments with set
semantics. */
+ enum SortDirection implements Serializable {
Review Comment:
do we need it to have `Serializable`?
aren't java's enums serializable by default?
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