code: public String getColumnlist(boolean upperCase) {
  	StringBuilder sb = new StringBuilder();
  	for (int i = 0; i < columnNames.length; i++) {
  	    if (i > 0) sb.append(',');
  	    sb.append(upperCase ? columnNames[i].getUpperString() : columnNames[i].getString());
  	}
  	return sb.toString();
      }
docs: return a string list of all columns
  
  @return string list