fix #26 INSERT...SELECT causes an exception

Author: jayvynl

clickhouse_backend/driver/client.py

@@ -5,7 +5,7 @@
 
 from .escape import escape_params
 
-insert_pattern = re.compile(r'\s*insert\s+into', flags=re.IGNORECASE)
+insert_pattern = re.compile(r'\s*insert\s+into.+?values\s*', flags=re.IGNORECASE)
 
 
 class Client(client.Client):

tests/basic/tests.py

@@ -829,3 +829,10 @@ def test_saving_an_object_again_does_not_create_a_new_object(self):
         a.headline = "Updated headline"
         a.save()
         self.assertEqual(a.id, current_id)
+
+
+class RawSQLTest(TestCase):
+    def test_insert_select(self):
+        table = Article._meta.db_table
+        with connections[DEFAULT_DB_ALIAS].cursor() as cursor:
+            cursor.execute(f'insert into {table} select * from {table}')