lower case table doesnt guard against column from other table copied in

[zzzeek]

as noticed in #5617, metadata works, but lower cases dont guard:

from sqlalchemy import *


c1 = column('x', Integer)
c2 = column('y', Integer)

t = table('t', c1, c2)

t2 = table('t2', c1, c2)

t.c.x is t2.c.x



m = MetaData()


c1 = Column('x', Integer)
c2 = Column('y', Integer)

t = Table('t', m, c1, c2)

t2 = Table('t2', m, c1, c2)

t.c.x is t2.c.x

[sqla-tester]

Mike Bayer has proposed a fix for this issue in the master branch:

raise on lower-case column shared to multiple tables https://gerrit.sqlalchemy.org/c/sqlalchemy/sqlalchemy/+/2277

[sqla-tester]

Mike Bayer has proposed a fix for this issue in the rel_1_3 branch:

raise on lower-case column shared to multiple tables https://gerrit.sqlalchemy.org/c/sqlalchemy/sqlalchemy/+/2278