[Sqlalchemy-tickets] Issue #3180: don't fall over for dialects that have discrepancies in table cols vs. index cols reported (zzzeek/sqlalchemy)

[Mike B. <iss...@bi...>]

New issue 3180: don't fall over for dialects that have discrepancies in table cols vs. index cols reported
https://bitbucket.org/zzzeek/sqlalchemy/issue/3180/dont-fall-over-for-dialects-that-have

Mike Bayer:

this is happening on oracle but we can just guard against this more fundamentally:


```
#!python

from sqlalchemy import create_engine, Table, MetaData, Integer
import mock

e = create_engine("sqlite://")
e.execute("""create table x (a integer, b integer)""")
e.execute("""create index x_i on x(a, b)""")

def mock_get_columns(self, connection, table_name, **kw):
    return [
        {"name": "b", "type": Integer, "primary_key": False}
    ]

with mock.patch.object(e.dialect, "get_columns", mock_get_columns):
    m = MetaData()
    t = Table('x', m, autoload_with=e)
```