Introduction :-

Harnessing the power of Snowflake and AWS together can significantly enhance your data operations. This guide will walk you through the process of creating an external function in Snowflake, integrated with AWS services.

Prerequisites :-

Ensure you have completed the initial Snowflake API integration

Step-by-Step Guide to Creating an External Function

1. Define the External Function

To define your external function, you will use the CREATE EXTERNAL FUNCTION command. Here is a template to get you started:

CREATE EXTERNAL FUNCTION my_external_function(n INTEGER, v VARCHAR)
 RETURNS VARIANT
 API_INTEGRATION = your_api_integration_name
 AS '<resource_invocation_url>';

2. Customize the Command

Personalize the command to suit your specific needs:

- Replace your_api_integration_name with the name of the API integration you previously created.
- Substitute <resource_invocation_url> with the Resource Invocation URL from your worksheet. Ensure this URL contains the API Gateway resource name, not just the stage name.
- Optionally, modify the function name to better reflect its purpose.

3. Configure Function Arguments

This example utilizes two arguments (an INTEGER and a VARCHAR) to match the expected input for the Lambda function. Adjust the arguments as needed for your specific Lambda function requirements.

4. Execute the Command

If you have not already executed the CREATE EXTERNAL FUNCTION command, do so now to create the function in Snowflake.

Testing Your External Function

The final step is to call your external function to ensure it operates correctly. For comprehensive details on how to do this, refer to the section “Calling an External Function for AWS” in the relevant documentation.

Conclusion :-

This guide equips you with the necessary steps to create and integrate an external function within Snowflake, leveraging the robust functionalities of AWS. By following these instructions, you can optimize your data processes and maximize the capabilities of both platforms.