add test case to capture default impl

diff --git a/test/sql/test_types.py b/test/sql/test_types.py
index d4ef25b4b95da3065461345b151bd4fe57cb92ef..942c0c5874836a1f7cd7607fb4a319b72631f05e 100644 (file)
--- a/test/sql/test_types.py
+++ b/test/sql/test_types.py
@@ -3810,8 +3810,10 @@ class PickleTest(fixtures.TestBase):
             assert p1.compare_values(p1.copy_value(obj), obj)
 
     def test_customized_impl(self):
-        p1 = PickleType(impl=mysql.LONGBLOB)
+        p1 = PickleType()
+        assert isinstance(p1.impl, LargeBinary)
 
+        p1 = PickleType(impl=mysql.LONGBLOB)
         assert isinstance(p1.impl, mysql.LONGBLOB)