Merge "implement cython for cache_anon_map, prefix_anon_map" into main

1 files changed, 6 insertions, 21 deletions

diff --git a/lib/sqlalchemy/sql/base.py b/lib/sqlalchemy/sql/base.py
index 4165751ca..b5a20830d 100644
--- a/lib/sqlalchemy/sql/base.py
+++ b/lib/sqlalchemy/sql/base.py
@@ -30,6 +30,12 @@ from .. import util
 from ..util import HasMemoized
 from ..util import hybridmethod
 
+try:
+    from sqlalchemy.cyextension.util import prefix_anon_map  # noqa
+except ImportError:
+    from ._py_util import prefix_anon_map  # noqa
+
+
 coercions = None
 elements = None
 type_api = None
@@ -1012,27 +1018,6 @@ class Executable(roles.StatementRole, Generative):
         return self._execution_options
 
 
-class prefix_anon_map(dict):
-    """A map that creates new keys for missing key access.
-
-    Considers keys of the form "<ident> <name>" to produce
-    new symbols "<name>_<index>", where "index" is an incrementing integer
-    corresponding to <name>.
-
-    Inlines the approach taken by :class:`sqlalchemy.util.PopulateDict` which
-    is otherwise usually used for this type of operation.
-
-    """
-
-    def __missing__(self, key):
-        (ident, derived) = key.split(" ", 1)
-        anonymous_counter = self.get(derived, 1)
-        self[derived] = anonymous_counter + 1
-        value = derived + "_" + str(anonymous_counter)
-        self[key] = value
-        return value
-
-
 class SchemaEventTarget:
     """Base class for elements that are the targets of :class:`.DDLEvents`
     events.