WIP: createBatchOperation()

[mfix22]

New createBatchOperation() API

This would not only let users delegate to multiple roots at once (with aliasing), but also create a batched operation to send directly to downstream remoteSchemas (using toPromise(execute(link, operation)) for example)

• delegateToSchema() and createDocument() use createBatchOperation
  to ensure tests pass w/ either
  • Let me know if you want me to revert those changes. It was more an exercise to see if I cover all the current tests before writing more tests

CC: @freiksenet, @stubailo

[mfix22]

Also i know the new API is landing soon, so I can definitely refactor this to work with the new API if need be. Just thought I would toss up my progress sooner rather than later.

[freiksenet]

This is cool. 👍

I think this will also enable using data loader with delegateToSchema, as createBatchOperation can be used as a batch operation.

I wonder if you could rebase it on top of next-api, I think it's gonna be merged very soon and I feel we should base the work on that.

[mfix22]

Sounds good. I'll try and rebase off of next-api.

Totally! There are tons of batching type updates we can work on separate to this too, like for example collecting up fields such that only one fetch to a remote schema is made per request cycle (instead of one per root) (:

[freiksenet]

Closing in favor of #724