public static String normalizeColumn(String column) {
    if (column == null) {
      return "null";
    }
    return column.replace("\t", " ").replace("\r\n", " ").replace("\n", " ");
  }
@Test
  void testColumn() {
    assertEquals("hello world", TableDataUtils.normalizeColumn("hello\tworld"));
    assertEquals("hello world", TableDataUtils.normalizeColumn("hello\nworld"));
    assertEquals("hello world", TableDataUtils.normalizeColumn("hello\r\nworld"));
    assertEquals("hello  world", TableDataUtils.normalizeColumn("hello\t\nworld"));

    assertEquals("null", TableDataUtils.normalizeColumn(null));
  }