[Sqlalchemy-tickets] Issue #3584: Column.copy and TypeDecorator bug in 1.1 beta (zzzeek/sqlalchemy)

[Yegor R. <iss...@bi...>]

New issue 3584: Column.copy and TypeDecorator bug in 1.1 beta
https://bitbucket.org/zzzeek/sqlalchemy/issues/3584/columncopy-and-typedecorator-bug-in-11

Yegor Roganov:

As per https://bitbucket.org/zzzeek/sqlalchemy/commits/ed535649d423
 `TypeDecorator` inherits from `SchemaEventTarget`, thus this statement
```
        if isinstance(type_, SchemaEventTarget):
            type_ = type_.copy(**kw)
```
in `Column.copy` raises `TypeError: copy() got an unexpected keyword argument 'schema'` since `TypeDecorator.copy` doesn't accept any params.


Part of the stacktrace:
```
  File "alembic/env.py", line 24, in merge_metadata
    t.tometadata(base_metadata)
  File "env/lib/python3.4/site-packages/sqlalchemy/sql/schema.py", line 814, in tometadata
    args.append(c.copy(schema=schema))
  File "env/lib/python3.4/site-packages/sqlalchemy/sql/schema.py", line 1330, in copy
    type_ = type_.copy(**kw)
TypeError: copy() got an unexpected keyword argument 'schema'
```