Allow session.exec(delete(Table)) to delete all rows from a table

Author: jnewbery

sqlmodel/orm/session.py

@@ -17,6 +17,7 @@
 from sqlalchemy.orm._typing import OrmExecuteOptionsParameter
 from sqlalchemy.sql._typing import _ColumnsClauseArgument
 from sqlalchemy.sql.base import Executable as _Executable
+from sqlalchemy.sql import Delete
 from sqlmodel.sql.base import Executable
 from sqlmodel.sql.expression import Select, SelectOfScalar
 from typing_extensions import deprecated
@@ -49,20 +50,34 @@ def exec(
         _add_event: Optional[Any] = None,
     ) -> ScalarResult[_TSelectParam]: ...
 
+    @overload
+    def exec(
+        self,
+        statement: Delete[_TSelectParam],
+        *,
+        params: Optional[Union[Mapping[str, Any], Sequence[Mapping[str, Any]]]] = None,
+        execution_options: Mapping[str, Any] = util.EMPTY_DICT,
+        bind_arguments: Optional[Dict[str, Any]] = None,
+        _parent_execute_state: Optional[Any] = None,
+        _add_event: Optional[Any] = None,
+    ) -> None:
+        ...
+
     def exec(
         self,
         statement: Union[
             Select[_TSelectParam],
             SelectOfScalar[_TSelectParam],
             Executable[_TSelectParam],
+            Delete[_TSelectParam],
         ],
         *,
         params: Optional[Union[Mapping[str, Any], Sequence[Mapping[str, Any]]]] = None,
         execution_options: Mapping[str, Any] = util.EMPTY_DICT,
         bind_arguments: Optional[Dict[str, Any]] = None,
         _parent_execute_state: Optional[Any] = None,
         _add_event: Optional[Any] = None,
-    ) -> Union[TupleResult[_TSelectParam], ScalarResult[_TSelectParam]]:
+    ) -> Union[TupleResult[_TSelectParam], ScalarResult[_TSelectParam], None]:
         results = super().execute(
             statement,
             params=params,