Adding a groupby ability to subgraph of the graph protocol

Question

How would I add the aggregation and grouping to a subgraph deployed as a hosted service on thegraph protocol? The schema.graphql does not support adding a type Query{...} or a type object in general such as

type Aggregated{
  field: String!
  value: String!
}

When I try to add these, I am getting Aggregated: - Defined without @entity directive- Missing field: id: ID!

Do you know any example subgraphs that support grouping? Thanks

Answer 1

field id is mandatory,

try this

type Aggregated{
  id: ID! 
  field: String!
  value: String!
}