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-rw-r--r--lib/sqlalchemy/sql/schema.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/sqlalchemy/sql/schema.py b/lib/sqlalchemy/sql/schema.py
index c270e1564..33e300bf6 100644
--- a/lib/sqlalchemy/sql/schema.py
+++ b/lib/sqlalchemy/sql/schema.py
@@ -51,7 +51,7 @@ from . import visitors
from .base import DedupeColumnCollection
from .base import DialectKWArgs
from .base import Executable
-from .base import SchemaEventTarget
+from .base import SchemaEventTarget as SchemaEventTarget
from .coercions import _document_text_coercion
from .elements import ClauseElement
from .elements import ColumnClause
@@ -2676,6 +2676,10 @@ class DefaultGenerator(Executable, SchemaItem):
def __init__(self, for_update=False):
self.for_update = for_update
+ @util.memoized_property
+ def is_callable(self):
+ raise NotImplementedError()
+
def _set_parent(self, column, **kw):
self.column = column
if self.for_update: