rdblue commented on a change in pull request #1368:
URL: https://github.com/apache/iceberg/pull/1368#discussion_r477439181
##########
File path:
api/src/main/java/org/apache/iceberg/transforms/TimestampTransform.java
##########
@@ -28,22 +28,47 @@
import org.apache.iceberg.expressions.Expression;
import org.apache.iceberg.expressions.Expressions;
import org.apache.iceberg.expressions.UnboundPredicate;
+import org.apache.iceberg.relocated.com.google.common.base.Objects;
import org.apache.iceberg.types.Type;
import org.apache.iceberg.types.Types;
-enum Timestamps implements Transform<Long, Integer> {
- YEAR(ChronoUnit.YEARS, "year"),
- MONTH(ChronoUnit.MONTHS, "month"),
- DAY(ChronoUnit.DAYS, "day"),
- HOUR(ChronoUnit.HOURS, "hour");
+abstract class TimestampTransform implements Transform<Long, Integer> {
private static final OffsetDateTime EPOCH =
Instant.ofEpochSecond(0).atOffset(ZoneOffset.UTC);
- private final ChronoUnit granularity;
- private final String name;
- Timestamps(ChronoUnit granularity, String name) {
+ private ChronoUnit granularity;
+ private String name;
+ private ZoneOffset zoneOffset;
+
+ @SuppressWarnings("unchecked")
+ static TimestampTransform get(Type type, String name) {
+ if (type.typeId() == Type.TypeID.TIMESTAMP) {
+ switch (name.toUpperCase()) {
+ case "YEAR":
+ return new TimestampTransform.TimestampYear(name.toLowerCase());
+ case "MONTH":
+ return new TimestampTransform.TimestampMonth(name.toLowerCase());
+ case "DAY":
+ return new TimestampTransform.TimestampDay(name.toLowerCase());
+ case "HOUR":
+ return new TimestampTransform.TimestampHour(name.toLowerCase());
+ default:
+ throw new UnsupportedOperationException("Unsupported timestamp
method: " + name);
+ }
+ }
+ throw new UnsupportedOperationException(
+ "TimestampTransform cannot transform type: " + type);
+ }
+
+ private TimestampTransform(ChronoUnit granularity, String name) {
this.granularity = granularity;
this.name = name;
+ this.zoneOffset = ZoneOffset.UTC;
+ }
+
+ public TimestampTransform zoneOffset(ZoneOffset newZoneOffset) {
+ this.zoneOffset = newZoneOffset;
Review comment:
Why is `zoneOffset` mutable?
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