1 files changed, 10 insertions, 0 deletions
diff --git a/lib/sqlalchemy/orm/identity.py b/lib/sqlalchemy/orm/identity.py
index 63b131a78..4848f73f1 100644
--- a/lib/sqlalchemy/orm/identity.py
+++ b/lib/sqlalchemy/orm/identity.py
@@ -68,6 +68,11 @@ class IdentityMap:
     ) -> Optional[_O]:
         raise NotImplementedError()
 
+    def fast_get_state(
+        self, key: _IdentityKeyType[_O]
+    ) -> Optional[InstanceState[_O]]:
+        raise NotImplementedError()
+
     def keys(self) -> Iterable[_IdentityKeyType[Any]]:
         return self._dict.keys()
 
@@ -206,6 +211,11 @@ class WeakInstanceDict(IdentityMap):
         self._dict[key] = state
         state._instance_dict = self._wr
 
+    def fast_get_state(
+        self, key: _IdentityKeyType[_O]
+    ) -> Optional[InstanceState[_O]]:
+        return self._dict.get(key)
+
     def get(
         self, key: _IdentityKeyType[_O], default: Optional[_O] = None
     ) -> Optional[_O]: