better example documentation

Signed-off-by: Andre Furlan <[email protected]>

Author: andrefurlan-db

examples/README.md

@@ -38,3 +38,4 @@ To run all of these examples you can clone the entire repository to your disk. O
 this example the string `ExamplePartnerTag` will be added to the the user agent on every request.
 - **`staging_ingestion.py`** shows how the connector handles Databricks' experimental staging ingestion commands `GET`, `PUT`, and `REMOVE`.
 - **`sqlalchemy.py`** shows a basic example of connecting to Databricks with [SQLAlchemy](https://www.sqlalchemy.org/). 
+- **`custom_cred_provider.py`** shows how to pass a custom credential provider to bypass connector authentication. Please install databricks-sdk prior to running this example.

examples/custom_cred_provider.py

@@ -1,3 +1,5 @@
+# please install databricks-sdk prior to running this example.
+
 from databricks import sql
 from databricks.sdk.oauth import OAuthClient
 import os
@@ -16,7 +18,7 @@
                  http_path       = os.getenv("DATABRICKS_HTTP_PATH"),
                  credentials_provider=creds) as connection:
 
-    for x in range(1, 100):
+    for x in range(1, 5):
         cursor = connection.cursor()
         cursor.execute('SELECT 1+1')
         result = cursor.fetchall()