- DeferredColumnLoader checks row for column, if present sends it to

ColumnLoader to create the row processor
- eager loaders ensure deferred foreign key cols are present in the primary list of columns (and secondary...).  because eager loading with LIMIT/OFFSET doesn't re-join to the parent table anymore this is now necessary. [ticket:864]

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/sqlalchemy/sql/util.py b/lib/sqlalchemy/sql/util.py
index 81d28ac7e..70d1940e6 100644
--- a/lib/sqlalchemy/sql/util.py
+++ b/lib/sqlalchemy/sql/util.py
@@ -96,6 +96,11 @@ class ColumnFinder(visitors.ClauseVisitor):
     def __iter__(self):
         return iter(self.columns)
 
+def find_columns(selectable):
+    cf = ColumnFinder()
+    cf.traverse(selectable)
+    return iter(cf)
+    
 class ColumnsInClause(visitors.ClauseVisitor):
     """Given a selectable, visit clauses and determine if any columns
     from the clause are in the selectable.