[Sqlalchemy-tickets] Issue #4135: Enable set_shard on baked qurires (zzzeek/sqlalchemy)

[Rishi S. <iss...@bi...>]

New issue 4135: Enable set_shard on baked qurires
https://bitbucket.org/zzzeek/sqlalchemy/issues/4135/enable-set_shard-on-baked-qurires

Rishi Sharma:

I am exploring the use of baked queries to help reduce the compilation overhead. Looks great, however, we use ShardedQuery as the query_cls in our session and need the flexibility to set_shard on the query object. The reason for this is to avoid our catch-all implementation of query_chooser, which calls query.statement and negates the performance gain from the baked query.


Roughly speaking, being able to do the following would be useful for us:
```
#!python

baked_query(session).params(user_id=user_id).set_shard(shard_id).one_or_none()
```

We are currently on 1.1.15