Bug: @requires directive behaves unexpectedly

[ya-at]

Describe the bug

Under certain circumstances, the @requires directive behaves unexpectedly. The router incorrectly asks subgraph for both:

1. The target field annotated with @requires
2. The dependent fields specified in the @requires directive

To Reproduce

User subgraph:

type Query {
  myUser: User
}

type User @key(fields: "id") {
  id: Int!
  productStats: ProductStats
  suitableProductsCount: Int @requires(fields: "productStats { productMeta { cost } }")
}

type ProductStats @key(fields: "id", resolvable: false) {
  id: Int!
  productMeta: ProductMeta @shareable
}

type ProductMeta {
  cost: Int @external
  userRating: Int
}

Stats subgraph:

type ProductStats @key(fields: "id") {
  id: Int!
  productMeta: ProductMeta @shareable
}

type ProductMeta {
  cost: Int @shareable
}

Request:

query MyQuery {
  myUser {
    suitableProductsCount
  }
}

What router sends to user subgraph:

query MyQuery__user__0 { myUser { productStats { productMeta { cost } } suitableProductsCount } }

Expected behavior

1. router sends request to user subgraph and asks for { myUser { id productStats { id } }.
2. Then, the entity resolver for ProductStats is used to obtain cost from stats subgraph.
3. And then the entity resolver for User is used to calculate suitableProductsCount.

Output

I tried to fix this by markingproductMeta: ProductMeta as @external in user subgraph and writing @provides(fields: "productMeta { userRating }"). However, it didn't work.

If I move userRating to another place and mark productMeta: ProductMeta as @external, then it works. If productMeta is not marked as @external, then it still doesn't work.

Desktop (please complete the following information):

• OS: macOS
• Version 15