code: protected ManagedProcessBuilder addArgument(String argPart1, String separator, String argPart2) {
          // @see MariaDB4j Issue #30 why 'quoting' (https://github.com/vorburger/MariaDB4j/issues/30)
          StringBuilder sb = new StringBuilder();
          sb.append(StringUtils.quoteArgument(argPart1));
          sb.append(separator);
          sb.append(StringUtils.quoteArgument(argPart2));
          // @see https://issues.apache.org/jira/browse/EXEC-93 why we have to use 'false' here
          // TODO Remove the false when commons-exec has a release including EXEC-93 fixed.
          addArgument(sb.toString(), false);
          return this;
      }
docs: Adds a single argument to the command, composed of two parts and a given separator.
  The two parts are independently escaped (see above), and then concatenated using the separator.