GraphQL连接上的`fields'参数有什么作用？

Question

我无法在amplify / graphQL中找到任何有关此目的的文档，

这是为什么：

@connection(keyName: "bySeason", fields: ["id"])`

与

有什么不同

@connection(keyName: "bySeason")

示例模型

type League @model
{
  id: ID!
  name: String!
  seasons: [Season] @connection(keyName: "bySeason", fields: ["id"])
}