presto-iceberg/src/main/java/io/prestosql/plugin/iceberg/PartitionTransforms.java/ColumnTransform/ColumnTransform
class ColumnTransform:        public ColumnTransform(Type type, Function<Block, Block> transform)
        {
            this.type = requireNonNull(type, "resultType is null");
            this.transform = requireNonNull(transform, "transform is null");
        }