[Sqlalchemy-tickets] Issue #3287: Load options ignore inherited classes with alias (zzzeek/sqlalchemy)

[malthe <iss...@bi...>]

New issue 3287: Load options ignore inherited classes with alias
https://bitbucket.org/zzzeek/sqlalchemy/issue/3287/load-options-ignore-inherited-classes-with

malthe:

If a query is made on an alias then the ``load_only`` option fails to exclude properties that are set on a base class of the aliased mapper.
```python
q = sess.query(alias).options(load_only("age"))
```
This is demonstrated in a test case here: https://github.com/malthe/sqlalchemy/tree/load-only-with-alias-issue