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-rw-r--r--lib/sqlalchemy/sql/util.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/sql/util.py b/lib/sqlalchemy/sql/util.py
index ac95c3a20..27ae3e624 100644
--- a/lib/sqlalchemy/sql/util.py
+++ b/lib/sqlalchemy/sql/util.py
@@ -298,7 +298,7 @@ def reduce_columns(columns, *clauses, **kw):
omit = util.column_set()
for col in columns:
- for fk in col.foreign_keys:
+ for fk in chain(*[c.foreign_keys for c in col.proxy_set]):
for c in columns:
if c is col:
continue