From af47a68a330ae5842983f9e7bfc443fd184352e9 Mon Sep 17 00:00:00 2001
From: Kamun Rustem <r.kamun@gmail.com>
Date: Sun, 14 Feb 2021 16:10:14 -0800
Subject: [PATCH] fallback to NullType when dialect type not found

---
 snowdialect.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/snowdialect.py b/snowdialect.py
index 2d744371..02d647cd 100644
--- a/snowdialect.py
+++ b/snowdialect.py
@@ -380,8 +380,7 @@ def _get_schema_columns(self, connection, schema, **kw):
                                 (sqltypes.String, sqltypes.BINARY)):
                     col_type_kw['length'] = character_maximum_length
 
-            type_instance = col_type(**col_type_kw)
-
+            type_instance = col_type if isinstance(col_type, sqltypes.NullType) else col_type(**col_type_kw)
             current_table_pks = schema_primary_keys.get(table_name)
 
             ans[table_name].append({