docs: private String checkIdentifierStart(
              final String identifier, final String statement
              ) throws VoltCompilerException {
  
          assert identifier != null && ! identifier.trim().isEmpty();
          assert statement != null && ! statement.trim().isEmpty();
  
          int loc = 0;
          do {
              if ( ! Character.isJavaIdentifierStart(identifier.charAt(loc))) {
                  String msg = "Unknown indentifier in DDL: \"" +
                          statement.substring(0,statement.length()-1) +
                          "\" contains invalid identifier \"" + identifier + "\"";
                  throw m_compiler.new VoltCompilerException(msg);
              }
              loc = identifier.indexOf('.', loc) + 1;
          }
          while( loc > 0 && loc < identifier.length());
  
          return identifier;
      }