Refetch only missing field with node resolver

As far as I can see, it's not possible to just refetch a single resolved field on a Node (type that implements the `Node` interface). So when using partially cached data, it's possible to first render the present data, but then the whole parent query is queried afterwards even though only one specific field was missing.

I managed to narrow down the missing field with `missingFieldHandlers`, but at a specific point, there's actually missing data. I agree that this aligns with [what the docs state](https://relay.dev/docs/guided-tour/reusing-cached-data/rendering-partially-cached-data/#:~:text=When%20the%20UsernameComponent,fragments%2C%20is%20missing.).

Is there an option to tell Relay to only refetch the missing field and not the _whole_ query if there is missing data?

Start by reading the partially cached data guidance linked in the issue and tracing how missingFieldHandlers interact with Node resolvers. The issue names no source file or test; done would be a clear determination of whether field-only refetching is supported, with the behavior captured in an appropriate test or documentation.

Written by the indexing model from the issue text.