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-rw-r--r--lib/sqlalchemy/sql/operators.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/sql/operators.py b/lib/sqlalchemy/sql/operators.py
index 10d01acd6..a7e6af116 100644
--- a/lib/sqlalchemy/sql/operators.py
+++ b/lib/sqlalchemy/sql/operators.py
@@ -758,7 +758,7 @@ def nullslast_op(a):
_commutative = set([eq, ne, add, mul])
-_comparison = set([eq, ne, lt, gt, ge, le])
+_comparison = set([eq, ne, lt, gt, ge, le, between_op])
def is_comparison(op):