Feature Request: ID Key

[gsouza-cat]

Starting with this GraphQL schema, assume that the 'id' field on Bar is used to resolve the 'bars' field on Foo.

type Foo {
    id: ID!
    name: String!
    bars: [Bar]! @goField(forceResolver: true)
}

type Bar {
    id: ID!
    name: String!
}

If a caller makes the following query, the Bar resolver runs, but it is not needed, because only 'id' from Bar is requested (which is already known).

query Example { foo(id: "id") { id name bars { id } } }

It would be useful to tag ID fields on the 'bars' field of Foo, and skip calling the resolver if only those fields are requested in a query. This is how cosmo federation works with resolving a federated entity, which is a useful feature to have for efficiency. i.e. something like this:

type Foo {
    id: ID!
    name: String!
    bars: [Bar]! @goField(forceResolver: true)
}

type Bar @key(fields: "id") {
    id: ID!
    name: String!
}