如何从Graphql返回来自多个集合的数据？

union Result = User | Product

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

type Product {
  id: ID!
  name: String!
  price: Float!
}

type Query {
  search(query: String!): [Result]
}

query {
  search(query: "example") {
    ... on User {
      id
      name
    }
    ... on Product {
      id
      name
      price
    }
  }
}

interface Node {
  id: ID!
}

type User implements Node {
  id: ID!
  name: String!
}

type Product implements Node {
  id: ID!
  name: String!
  price: Float!
}

type Query {
  getNode(id: ID!): Node
}

query {
  getNode(id: "example") {
    id
    ... on User {
      name
    }
    ... on Product {
      name
      price
    }
  }
}