snuyanzin commented on code in PR #27929:
URL: https://github.com/apache/flink/pull/27929#discussion_r3081116143
##########
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 {
+ /** Ascending order with nulls first. */
+ ASC_NULLS_FIRST(false, true),
+ /** Ascending order with nulls last. */
+ ASC_NULLS_LAST(false, false),
+ /** Descending order with nulls first. */
+ DESC_NULLS_FIRST(true, true),
+ /** Descending order with nulls last. */
+ DESC_NULLS_LAST(true, false);
+
+ private final boolean descending;
+ private final boolean nullsFirst;
Review Comment:
can we instead reuse Calcite's `Direction`
https://github.com/apache/calcite/blob/0ce0c5ae2f7055f13551ebcde8e1aaa2ff17b469/core/src/main/java/org/apache/calcite/rel/RelFieldCollation.java#L54
?
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