[Bug] Entities Response for Apollo Federation is out of order

[JLaferri]

Unfortunately I don't know the minimal amount of data required to trigger this behavior but basically the data returned in _entities is not in the same order as the objects in my representations input. This causes the data to mismatch with the ID when using Dgraph as a subgraph.

Here is an example:

It does look like the logic attempts to order the entities correctly as per here: https://github.com/dgraph-io/dgraph/blob/master/graphql/resolve/resolver.go#L407

Seems for some reason this fails for me. I suppose I will tag @minhaj-shakeel as it seems this was written by them.

Additionally, I will try to get a local dev environment set up for Dgraph tomorrow to see if I can fix this bug though I have a feeling I may struggle getting that going.

[github-actions]

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