[Sqlalchemy-tickets] Issue #3033: WHERE 0 = 1 silently generated (zzzeek/sqlalchemy)

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

New issue 3033: WHERE 0 = 1 silently generated
https://bitbucket.org/zzzeek/sqlalchemy/issue/3033/where-0-1-silently-generated

Jefffrey:

Running:


```
#!python

query = session.query(A).filter( and_( A.id == string_a
                                                          , A.b.key == string_b ) )
```


where:


```
#!python

class A(Base):
    __tablename__   = 'a_table'
    id              = Column(Integer, primary_key = True)
    # ...

class B(Base):
    __tablename__       = 'b_table'
    id                  = Column(Integer, primary_key = True)
    # ...
    a_id = Column(Integer, ForeignKey('a_table.id'), nullable = False)
    a = relationship("A", backref = backref("b", uselist = False))
```

produces a query like:


```
#!sql

SELECT ... 
FROM a_table
WHERE 0 = 1
```