huaxingao commented on code in PR #13166:
URL: https://github.com/apache/iceberg/pull/13166#discussion_r2118340730
##########
spark/v4.0/spark/src/main/java/org/apache/iceberg/spark/functions/HoursFunction.java:
##########
@@ -57,7 +60,19 @@ public String name() {
return "hours";
}
- public static class TimestampToHoursFunction extends
BaseScalarFunction<Integer> {
+ public abstract static class BaseToHourFunction extends
BaseScalarFunction<Integer>
+ implements ReducibleFunction<Integer, Integer> {
+ @Override
+ public Reducer<Integer, Integer> reducer(ReducibleFunction<?, ?>
otherBucketFunction) {
+
Review Comment:
nit: Remove this line?
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