nastra commented on code in PR #9008:
URL: https://github.com/apache/iceberg/pull/9008#discussion_r1629247791


##########
api/src/main/java/org/apache/iceberg/transforms/Timestamps.java:
##########
@@ -31,54 +33,162 @@
 import org.apache.iceberg.util.DateTimeUtil;
 import org.apache.iceberg.util.SerializableFunction;
 
-enum Timestamps implements Transform<Long, Integer> {
-  YEAR(ChronoUnit.YEARS, "year"),
-  MONTH(ChronoUnit.MONTHS, "month"),
-  DAY(ChronoUnit.DAYS, "day"),
-  HOUR(ChronoUnit.HOURS, "hour");
+class Timestamps implements Transform<Long, Integer> {
+
+  static final Timestamps YEAR_FROM_MICROS =
+      new Timestamps(ChronoUnit.MICROS, ResultTypeUnit.YEARS, "year");
+  static final Timestamps MONTH_FROM_MICROS =
+      new Timestamps(ChronoUnit.MICROS, ResultTypeUnit.MONTHS, "month");
+  static final Timestamps DAY_FROM_MICROS =
+      new Timestamps(ChronoUnit.MICROS, ResultTypeUnit.DAYS, "day");
+  static final Timestamps HOUR_FROM_MICROS =
+      new Timestamps(ChronoUnit.MICROS, ResultTypeUnit.HOURS, "hour");
+  static final Timestamps YEAR_FROM_NANOS =
+      new Timestamps(ChronoUnit.NANOS, ResultTypeUnit.YEARS, "year");
+  static final Timestamps MONTH_FROM_NANOS =
+      new Timestamps(ChronoUnit.NANOS, ResultTypeUnit.MONTHS, "month");
+  static final Timestamps DAY_FROM_NANOS =
+      new Timestamps(ChronoUnit.NANOS, ResultTypeUnit.DAYS, "day");
+  static final Timestamps HOUR_FROM_NANOS =
+      new Timestamps(ChronoUnit.NANOS, ResultTypeUnit.HOURS, "hour");
+
+  static Timestamps get(Types.TimestampType type, String resultTypeUnit) {
+    switch (resultTypeUnit.toLowerCase(Locale.ENGLISH)) {
+      case "year":
+        return get(type, ChronoUnit.YEARS);
+      case "month":
+        return get(type, ChronoUnit.MONTHS);
+      case "day":
+        return get(type, ChronoUnit.DAYS);
+      case "hour":
+        return get(type, ChronoUnit.HOURS);
+      default:
+        throw new IllegalArgumentException(
+            "Unsupported source/result type units: " + type + "->" + 
resultTypeUnit);

Review Comment:
   ```suggestion
               "Unsupported source/result type units: " + type + " -> " + 
resultTypeUnit);
   ```



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