Deferred columns inconsistency

We are using deferred column:

```
d_column = column_property(
func.pg_func(id), deferred=True)
```

It gave a naming error -- as SQL Alchemy generated column name on that. Hence we label it:

```
d_column = column_property(
func.pg_func(id).label('test'), deferred=True)
```

All works fine since that point, but this column doesn't appear in a sort.
Questions:
* Should it appear?
* If not -- why its name is validated?

首先使用 SQLAlchemy 重現 deferred column_property 範例，並檢查儲存庫中排序和欄位名稱驗證的進入點；issue 中未指定檔案或測試。比較帶標籤和不帶標籤的 deferred 欄位，然後確定並測試排序和驗證的預期行為。

由索引模型根據 Issue 內容生成。