@Test
void dropDuplicateRows() throws Exception {

  Table t1 = Table.read().csv("../data/bush.csv");
  int rowCount = t1.rowCount();
  Table t2 = Table.read().csv("../data/bush.csv");
  Table t3 = Table.read().csv("../data/bush.csv");
  t1.append(t2).append(t3);
  assertEquals(3 * rowCount, t1.rowCount());
  t1 = t1.dropDuplicateRows();
  assertEquals(rowCount, t1.rowCount());
}