Amazon S3 Object Lambda now integrates with Amazon Athena, allowing you to automatically modify S3 data as it is being queried. With S3 Object Lambda, you can add your own code to S3 GET, HEAD, and LIST API requests to modify data as it is returned to your application. For example, you can use a Lambda function to automatically mask sensitive data columns when running queries in Amazon Athena. When you use S3 Object Lambda with Amazon Athena, you can more easily customize your data for different applications, without having to maintain multiple derivative copies of source data in Amazon S3.
Source:: Amazon AWS