code: public static int findLabelColumn(BundleMeta meta) {
      for(int i = 0; i < meta.size(); i++) {
        if(TypeUtil.GUESSED_LABEL.isAssignableFromType(meta.get(i))) {
          return i;
        }
      }
      return -1;
    }
docs: Find the first "label-like" column (matching {@link TypeUtil#GUESSED_LABEL}
  ) in a type information.
  
  @param meta Meta data
  @return Column number, or {@code -1}.