@Test
public void testEmptyCopy() {

  DoubleColumn doubles = DoubleColumn.create("doubles", 100);
  for (int i = 0; i < 100; i++) {
    doubles.append(RandomUtils.nextDouble(0, 10_000));
  }
  DoubleColumn empty = doubles.emptyCopy();
  assertTrue(empty.isEmpty());
  assertEquals(doubles.name(), empty.name());
}