Method hour

fe/src/main/java/org/apache/impala/util/IcebergUtil.java:600–605

(String sourceName, int sourceId)

          }

          @Override
          public Pair<String, Integer> hour(String sourceName, int sourceId) {
            String mappingKey = getPartitionTransformMappingKey(sourceId,
                TIcebergPartitionTransformType.HOUR);
            return new Pair<>(mappingKey, null);
          }

          @Override
          public Pair<String, Integer> alwaysNull(int fieldId, String sourceName,