Hi.
I use [that](https://github.com/xzkostyan/clickhouse-sqlalchemy) library
and tries to make migrations using alembic.
Here is simple implementation for that dialect:
```
class ClickHOuseImpl(postgresql.PostgresqlImpl):
__dialect__ = 'clickhouse'
transactional_ddl = False
```
Here is what I got after running `alembic init`:
```
op.create_table('order_logs',
sa.Column('ts_spawn', clickhouse_sqlalchemy.types.UInt32(),
nullable=False),
sa.Column('platform_id', clickhouse_sqlalchemy.types.UInt32(),
nullable=False),
sa.Column('slave_prefix', clickhouse_sqlalchemy.types.String(),
nullable=False),
sa.Column('int_orders_ids', clickhouse_sqlalchemy.types.Array(<class
'clickhouse_sqlalchemy.types.UInt32'>), nullable=False),
sa.Column('state', clickhouse_sqlalchemy.types.UInt8(), nullable=False),
sa.Column('step', clickhouse_sqlalchemy.types.UInt8(), nullable=False),
sa.Column('ext_orders_ids', clickhouse_sqlalchemy.types.Array(<class
'clickhouse_sqlalchemy.types.String'>), nullable=True),
sa.Column('url', clickhouse_sqlalchemy.types.String(), nullable=True),
sa.Column('request', clickhouse_sqlalchemy.types.String(),
nullable=True),
sa.Column('response', clickhouse_sqlalchemy.types.String(),
nullable=True),
sa.PrimaryKeyConstraint('ts_spawn', 'platform_id', 'slave_prefix',
'int_orders_ids', 'state', 'step')
)
```
As you can see array-elements generated not correct: nested types have
`<class...>` substring.
`alembic.autogenerate.render._repr_type` shows me, that custom
representation of types uses only if module_name startswith
`sqlalchemy.dialects`:
```
...
if hasattr(autogen_context.migration_context, 'impl'):
impl_rt = autogen_context.migration_context.impl.render_type(
type_, autogen_context)
else:
impl_rt = None
mod = type(type_).__module__
imports = autogen_context.imports
if mod.startswith("sqlalchemy.dialects"):
dname = re.match(r"sqlalchemy\.dialects\.(\w+)", mod).group(1)
if imports is not None:
imports.add("from sqlalchemy.dialects import %s" % dname)
if impl_rt:
return impl_rt
...
```
Is there any ways to fix the problem?
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