Improve array_agg and Array processing

The :class:`_functions.array_agg` will now set the array dimensions to 1.
Improved :class:`_types.ARRAY` processing to accept ``None`` values as
value of a multi-array.

Fixes: #7083
Change-Id: Iafec4f77fde9719ccc7c8535bf6235dbfbc62102

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/sqlalchemy/testing/config.py b/lib/sqlalchemy/testing/config.py
index e418b48be..1cb463977 100644
--- a/lib/sqlalchemy/testing/config.py
+++ b/lib/sqlalchemy/testing/config.py
@@ -13,6 +13,8 @@ import collections
 import typing
 from typing import Any
 from typing import Iterable
+from typing import Optional
+from typing import overload
 from typing import Tuple
 from typing import Union
 
@@ -37,6 +39,15 @@ else:
     _fixture_functions = None  # installed by plugin_base
 
 
+@overload
+def combinations(
+    *comb: Union[Any, Tuple[Any, ...]],
+    argnames: Optional[str] = None,
+    id_: Optional[str] = None,
+):
+    ...
+
+
 def combinations(*comb: Union[Any, Tuple[Any, ...]], **kw: str):
     r"""Deliver multiple versions of a test based on positional combinations.