Fix MyPy issues

Signed-off-by: Levko Kravets <levko.ne@gmail.com>

src/databricks/sql/auth/thrift_http_client.py

@@ -1,7 +1,7 @@
 import base64
 import logging
 import urllib.parse
-from typing import Dict, Union
+from typing import Dict, Union, Optional
 
 import six
 import thrift
@@ -26,7 +26,7 @@ def __init__(
         uri_or_host,
         port=None,
         path=None,
-        ssl_options: SSLOptions = None,
+        ssl_options: Optional[SSLOptions] = None,
         max_connections: int = 1,
         retry_policy: Union[DatabricksRetryPolicy, int] = 0,
     ):
@@ -48,10 +48,11 @@ def __init__(
             self.scheme = parsed.scheme
             assert self.scheme in ("http", "https")
             if self.scheme == "https":
-                # TODO: Not sure if those options are used anywhere - need to double-check
-                self.certfile = self._ssl_options.tls_client_cert_file
-                self.keyfile = self._ssl_options.tls_client_cert_key_file
-                self.context = self._ssl_options.create_ssl_context()
+                if self._ssl_options is not None:
+                    # TODO: Not sure if those options are used anywhere - need to double-check
+                    self.certfile = self._ssl_options.tls_client_cert_file
+                    self.keyfile = self._ssl_options.tls_client_cert_key_file
+                    self.context = self._ssl_options.create_ssl_context()
             self.port = parsed.port
             self.host = parsed.hostname
             self.path = parsed.path

src/databricks/sql/types.py

@@ -32,8 +32,8 @@ class SSLOptions:
 
     def __init__(
         self,
-        tls_verify: Optional[bool] = True,
-        tls_verify_hostname: Optional[bool] = True,
+        tls_verify: bool = True,
+        tls_verify_hostname: bool = True,
         tls_trusted_ca_file: Optional[str] = None,
         tls_client_cert_file: Optional[str] = None,
         tls_client_cert_key_file: Optional[str] = None,