public static List<String> normalizeColumns(List<Object> columns) {
    return columns.stream()
            .map(TableDataUtils::normalizeColumn)
            .collect(Collectors.toList());
  }
@Test
  void testColumns() {
    assertEquals(Arrays.asList("hello world", "hello world"),
            TableDataUtils.normalizeColumns(new Object[]{"hello\tworld", "hello\nworld"}));

    assertEquals(Arrays.asList("hello world", "null"),
            TableDataUtils.normalizeColumns(new String[]{"hello\tworld", null}));
  }