support positional parameters at the execute level even for DBs where we dont expect positional

1 files changed, 4 insertions, 2 deletions

diff --git a/lib/sqlalchemy/engine/default.py b/lib/sqlalchemy/engine/default.py
index 1f2001e05..af1e42f38 100644
--- a/lib/sqlalchemy/engine/default.py
+++ b/lib/sqlalchemy/engine/default.py
@@ -180,8 +180,10 @@ class DefaultExecutionContext(base.ExecutionContext):
             return params
         else:
             def proc(d):
-                if d is None:
-                    return None
+                # sigh, sometimes we get positional arguments with a dialect
+                # that doesnt specify positional (because of execute_text())
+                if not isinstance(d, dict):
+                    return d
                 return dict([(k.encode(self.dialect.encoding), d[k]) for k in d])
             if isinstance(params, list):
                 return [proc(d) for d in params]