[Sqlalchemy-tickets] Issue #4320: Negation with .self_group() (zzzeek/sqlalchemy)

[Alana P. <iss...@bi...>]

New issue 4320: Negation with .self_group()
https://bitbucket.org/zzzeek/sqlalchemy/issues/4320/negation-with-self_group

Alana Pradhan:

I think this bug is an extension of https://bitbucket.org/zzzeek/sqlalchemy/issues/3969/negation-of-labeled-element

I hit this bug in 1.2.10 when I add `.self_group()` to the or_ expression:


```
#!python

from sqlalchemy import *
from sqlalchemy.dialects import sqlite
expr = or_(column('x') == 1, column('y') == 2).self_group()

bug = not_(expr.label('foo'))



print(bug.compile())
print(bug.compile(dialect=sqlite.dialect()))

```

```
NOT (x = :x_1 OR y = :y_1)
(x = ? OR y = ?) = 0
```