- adjustment for ref #3200 as we need an immutabledict() here so

that union() can be called, in the case of a dialect that uses
execution options inside of initialize() (e.g. oursql)

2 files changed, 13 insertions, 1 deletions

diff --git a/lib/sqlalchemy/engine/strategies.py b/lib/sqlalchemy/engine/strategies.py
index 49438372b..398ef8df6 100644
--- a/lib/sqlalchemy/engine/strategies.py
+++ b/lib/sqlalchemy/engine/strategies.py
@@ -162,7 +162,7 @@ class DefaultEngineStrategy(EngineStrategy):
             def first_connect(dbapi_connection, connection_record):
                 c = base.Connection(engine, connection=dbapi_connection,
                                     _has_events=False)
-                c._execution_options = {}
+                c._execution_options = util.immutabledict()
                 dialect.initialize(c)
             event.listen(pool, 'first_connect', first_connect, once=True)
 
diff --git a/test/engine/test_execute.py b/test/engine/test_execute.py
index a80d157ed..e0bba0afa 100644
--- a/test/engine/test_execute.py
+++ b/test/engine/test_execute.py
@@ -487,6 +487,18 @@ class ExecuteTest(fixtures.TestBase):
         conn.close()
 
     @testing.requires.ad_hoc_engines
+    def test_dialect_init_uses_options(self):
+        eng = create_engine(testing.db.url)
+
+        def my_init(connection):
+            connection.execution_options(foo='bar').execute(select([1]))
+
+        with patch.object(eng.dialect, "initialize", my_init):
+            conn = eng.connect()
+            eq_(conn._execution_options, {})
+            conn.close()
+
+    @testing.requires.ad_hoc_engines
     def test_generative_engine_event_dispatch_hasevents(self):
         def l1(*arg, **kw):
             pass