docs: static Collection<String> columnToAlias(Settings settings) {
          FieldAlias fa = alias(settings);
          List<String> columnNames = StringUtils.tokenize(settings.getProperty(HiveConstants.COLUMNS), ",");
  
          // eliminate virtual columns
          // we can't use virtual columns since some distro don't have this field...
          for (String vc : HiveConstants.VIRTUAL_COLUMNS) {
              columnNames.remove(vc);
          }
  
          for (int i = 0; i < columnNames.size(); i++) {
              String original = columnNames.get(i);
              String alias = fa.toES(original);
              if (alias != null) {
                  columnNames.set(i, alias);
              }
          }
          return columnNames;
      }