NewPlanner creates a new Planner from the Configuration and a ctx object The context.Context object is used to determine the lifecycle of stateful DataSources It's important to note that stateful DataSources must be closed when they are no longer being used Stateful DataSources could be those that initiate a WebSocket connection to an origin, a database client, a streaming client, etc..

LocalTypeFieldExtractor takes an ast.Document as input and generates the TypeField configuration for both root and child nodes.

RequiredFieldExtractor extracts all required fields from an ast.Document containing a parsed federation subgraph SDL by visiting the directives specified in the federation specification and extracting the required meta data.