[Sqlalchemy-tickets] Issue #4341: create_constraint=False not respected when inheritted (zzzeek/sqlalchemy)

[moon c. <iss...@bi...>]

New issue 4341: create_constraint=False not respected when inheritted
https://bitbucket.org/zzzeek/sqlalchemy/issues/4341/create_constraint-false-not-respected-when

moon cake:

Test case:
```py
import enum

from sqlalchemy import Column, Enum, Integer
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.schema import CreateTable


TableBase = declarative_base()


class Language(enum.Enum):
    english = 'English'


class Test(TableBase):
    __tablename__ = 'enum'

    id = Column(Integer, primary_key=True)
    language = Column(Enum(Language, native_enum=False, create_constraint=False))


class TestBase(TableBase):
    __abstract__ = True

    id = Column(Integer, primary_key=True)
    language = Column(Enum(Language, native_enum=False, create_constraint=False))


class TestInheritted(TestBase):
    __tablename__ = 'enum_inheritted'


print(CreateTable(Test.__table__))
print(CreateTable(TestInheritted.__table__))
```
Output:
```
CREATE TABLE enum (
        id INTEGER NOT NULL,
        language VARCHAR(7),
        PRIMARY KEY (id)
)



CREATE TABLE enum_inheritted (
        id INTEGER NOT NULL,
        language VARCHAR(7),
        PRIMARY KEY (id),
        CONSTRAINT language CHECK (language IN ('english'))
)
```