Query planner duplicate calls to services on interface types

[apollographql]

Query planner duplicate calls to services on interface types

[jazzyray]

Hello,

(Using "@apollo/gateway": "^0.19.1")

Just to add something to this.
Federation over interface objects is virutally unusable for us.

Consider the following federated GraphQL query that sits in front
of three services. Described in this blog post:

https://www.ontotext.com/blog/the-rise-of-the-knowledge-graph

The following graphql query

query {
    annotation(id: "https://www.ontotext.com/blog/the-rise-of-the-knowledge-graph/annotation/1") {
      body {
        source { 
          similar {
           id
           name
          }
        }
        purpose
      }
    }
  }

Returns the attached result and query plan. query-response.txt

The gateway invokes 10s of duplicate backend service queries to the same service with the same set of identical query variables/representations. See log apollo-gw.log

This is a performance nightmare.

Is there any further work (PR's) that might help save me time trying to resolve this.

[abernix]

The fix for this was released in @apollo/[email protected]! 🎉