more "column targeting" enhancements..columns have a "depth" from their ultimate source column so that corresponding_column() can find the column that is "closest" (i.e. fewest levels of proxying) to the requested column

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/sqlalchemy/schema.py b/lib/sqlalchemy/schema.py
index eb7eb8c1d..d7d728f2b 100644
--- a/lib/sqlalchemy/schema.py
+++ b/lib/sqlalchemy/schema.py
@@ -600,11 +600,11 @@ class Column(SchemaItem, sql._ColumnClause):
         This is a copy of this ``Column`` referenced by a different parent
         (such as an alias or select statement).
         """
-
         fk = [ForeignKey(f._colspec) for f in self.foreign_keys]
         c = Column(name or self.name, self.type, self.default, key = name or self.key, primary_key = self.primary_key, nullable = self.nullable, _is_oid = self._is_oid, quote=self.quote, *fk)
         c.table = selectable
         c.orig_set = self.orig_set
+        c._source_column = self
         c.__originating_column = self.__originating_column
         if not c._is_oid:
             selectable.columns.add(c)