diff options
Diffstat (limited to 'lib/sqlalchemy/sql/expression.py')
| -rw-r--r-- | lib/sqlalchemy/sql/expression.py | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/sqlalchemy/sql/expression.py b/lib/sqlalchemy/sql/expression.py index 9bc127291..1e02ba96a 100644 --- a/lib/sqlalchemy/sql/expression.py +++ b/lib/sqlalchemy/sql/expression.py @@ -2853,11 +2853,15 @@ class Join(FromClause): def get_children(self, **kwargs): return self.left, self.right, self.onclause - def _match_primaries(self, primary, secondary): + def _match_primaries(self, left, right): global sql_util if not sql_util: from sqlalchemy.sql import util as sql_util - return sql_util.join_condition(primary, secondary) + if isinstance(left, Join): + left_right = left.right + else: + left_right = None + return sql_util.join_condition(left, right, a_subset=left_right) def select(self, whereclause=None, fold_equivalents=False, **kwargs): """Create a :class:`Select` from this :class:`Join`. |