diff options
Diffstat (limited to 'lib/sqlalchemy/sql/util.py')
| -rw-r--r-- | lib/sqlalchemy/sql/util.py | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/sqlalchemy/sql/util.py b/lib/sqlalchemy/sql/util.py index d5f2417c2..1bd4dd857 100644 --- a/lib/sqlalchemy/sql/util.py +++ b/lib/sqlalchemy/sql/util.py @@ -439,12 +439,12 @@ class ClauseAdapter(visitors.ReplacingCloningVisitor): self.exclude = exclude self.equivalents = equivalents or {} - def _corresponding_column(self, col, require_embedded): + def _corresponding_column(self, col, require_embedded, _seen=util.EMPTY_SET): newcol = self.selectable.corresponding_column(col, require_embedded=require_embedded) - if not newcol and col in self.equivalents: + if not newcol and col in self.equivalents and col not in _seen: for equiv in self.equivalents[col]: - newcol = self.selectable.corresponding_column(equiv, require_embedded=require_embedded) + newcol = self._corresponding_column(equiv, require_embedded=require_embedded, _seen=_seen.union([col])) if newcol: return newcol return newcol |