Aggregation operation on DynamoDB+ElasticSearch

** Which Category is your question related to? ** GraphQL API

** What AWS Services are you utilizing? ** AppSync, DynamoDB, ElasticSearch

** Provide additional details e.g. code snippets ** Let’s assume I have defined the model in my Amplify app:

type Item @model @searchable {
  id: ID!
  inventoryType: String!
  itemName: String!
  price: Int
}

I want to do things like:

SELECT DISTINCT(inventoryType) FROM Item;
SELECT SUM(price) FROM Item;
SELECT SUM(price) FROM Item WHERE inventoryType="xxx";

As they are complex query, I want to utilize ElasticSearch. The graphql query generated by amplify codegen is:

export const searchItems = `query SearchItems(
  $filter: SearchableItemFilterInput
  $sort: SearchableItemSortInput
  $limit: Int
  $nextToken: Int
) {
  searchItems(
    filter: $filter
    sort: $sort
    limit: $limit
    nextToken: $nextToken
  ) {
    items {
      id
      inventoryType
      itemName
      price
    }
    nextToken
  }
}
`;

My questions are:

• Can I do the above operations by utilizing the generated query?
• If yes, what are the queries (filter) look like?
• If not, what is the right way to achieve this?

[krsnaa]

This seems like this is a valid questions re: aggregations on the GQL API. My guess is that it will require a custom VTL script. An official response/code-snippet would be appreciated.

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