The connector uses the result set streaming API to improve the performance in fetching query results. To take advantage of this feature you must include and allow the athena:GetQueryResultsStream action in your IAM policy statement. For details on managing Athena IAM policies, see https://docs.aws.amazon.com/athena/latest/ug/access.html. This is configured using the Use Result Set Streaming option (the UseResultSetStreaming property). For more information, see Use Result Set Streaming.