diff options
Diffstat (limited to 'lib/sqlalchemy/sql/util.py')
| -rw-r--r-- | lib/sqlalchemy/sql/util.py | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/sqlalchemy/sql/util.py b/lib/sqlalchemy/sql/util.py index 7bcc8e7d7..1b4bc67fc 100644 --- a/lib/sqlalchemy/sql/util.py +++ b/lib/sqlalchemy/sql/util.py @@ -104,6 +104,9 @@ def determine_date_affinity(expr): left_affin, right_affin = \ determine_date_affinity(expr.left), \ determine_date_affinity(expr.right) + + if left_affin is None or right_affin is None: + return None if operators.is_commutative(expr.operator): key = tuple(sorted([left_affin, right_affin], key=lambda cls:cls.__name__)) |