support custom DeParser

[redkale]

My requirement scenario is ：
sql template "SELECT * FROM user WHERE name = :param_name AND status = :param_status"
where param_name and param_status both is null, need generated sql: "SELECT * FROM user"
where param_name is not null, param_status is null, need generated sql: "SELECT * FROM user WHERE name = ? "
so deParse where expression maybe is empty

deparseDistinctClause、deparseSelectItemsClause、deparseOrderByElementsClause requires two parameters ,
Parameter plainSelect mainly used to determine the current selection. like：

  @Override
  protected void deparseDistinctClause(PlainSelect plainSelect, Distinct distinct) {
    if (this.countSelect != plainSelect) {
        super.deparseDistinctClause(plainSelect, distinct);
    } else {
        super.deparseDistinctClause(plainSelect, this.countDistinct);
    }
}

protected void deparseSelectItemsClause(PlainSelect plainSelect, List<SelectItem<?>> selectItems) {
    if (this.countSelect != plainSelect) {
        super.deparseSelectItemsClause(plainSelect, selectItems);
    } else {
        super.deparseSelectItemsClause(plainSelect, this.countRootSelectItems);
    }
}

protected void deparseOrderByElementsClause(PlainSelect plainSelect, List<OrderByElement> orderByElements) {
    if (this.countSelect != plainSelect) {
        super.deparseOrderByElementsClause(plainSelect, orderByElements);
    } else {
        super.deparseOrderByElementsClause(plainSelect, null);
    }
}

[redkale]

@manticore-projects thanks, I resubmitted a request.