lib/rom/sql/associations/many_to_many.rb in rom-sql-3.2.0 vs lib/rom/sql/associations/many_to_many.rb in rom-sql-3.3.0

@@ -18,10 +18,10 @@
           schema =
             if left.schema.key?(foreign_key)
               if target != self.target
                 target.schema.merge(join_schema)
               else
-                left.schema.project(*columns)
+                left.schema.uniq.project(*columns)
               end
             else
               target_schema
             end.qualified