private boolean parseSortKey(PsiBuilder builder) {
    PsiBuilder.Marker marker = builder.mark();
    if (!parseFieldName(builder)) {
      marker.drop();
      return false;
    }
    advanceIfMatches(builder, JqlTokenTypes.SORT_ORDERS);
    marker.done(JqlElementTypes.SORT_KEY);
    return true;
  }
private boolean parseSortKey(PsiBuilder builder)