One entity A we have defined the relationship as follows

/**
  * Derived From Event Types
  */
   @Relationship = {
     "/*": {
        "name": "DerivesFrom",
        "entityTypes": [ "pinterestThriftEnumItem" ],
     }
   }
   derivesFromEventTypes: array[Urn] = []

When we specify the relationships like so

mutation {
  updateEventDerivedMetric(urn: "urn:li:eventDerivedMetric:CLICKTHROUGH_TEST_123", 
    input: {
      name: "Clickthrough test 123",
      description: "description",
      derivesFromEventTypes: [         "urn:li:pinterestThriftEnumItem(ACCEPTED_CONTACT_REQUEST_WARNING_CLICK,EVENT_TYPE)",
      "urn:li:pinterestThriftEnumItem:(ACTIONED_USER_REPORT,EVENT_TYPE)"
      ]
  })
}

That works fine. And when we query the relationship on this entity like this:

{
  eventDerivedMetric(urn: "urn:li:eventDerivedMetric:CLICKTHROUGH_TEST_123"){
    urn
    relationships(input: {types: ["DerivesFrom"], direction: OUTGOING}){
      relationships {
        entity {
          urn
        }
      }
    }
  }
}

It works and we get

{
  "data": {
    "eventDerivedMetric": {
      "urn": "urn:li:eventDerivedMetric:CLICKTHROUGH_TEST_123",
      "relationships": {
        "relationships": [
          {
            "entity": {
              "urn": "urn:li:pinterestThriftEnumItem:(ACTIONED_USER_REPORT,EVENT_TYPE)"
            }
          },
          {
            "entity": {
              "urn": "urn:li:pinterestThriftEnumItem:(ACCEPTED_CONTACT_REQUEST_WARNING_CLICK,EVENT_TYPE)"
            }
          }
        ]
      }
    }
  }
}

Looks good. The problem comes when I query the relationship from the other entity using an

INCOMING

direction. So, using this query

{
  pinterestThriftEnumItem(urn: "urn:li:pinterestThriftEnumItem:(ACTIONED_USER_REPORT,EVENT_TYPE)"){
    urn
    category
    relationships(input: {types: ["DerivesFrom"], direction: INCOMING}){
      relationships {
        entity {
          urn
        }
      }
    }
  }
}

I get

null

in the relationship

{
  "data": {
    "pinterestThriftEnumItem": {
      "urn": "urn:li:pinterestThriftEnumItem:(ACTIONED_USER_REPORT,EVENT_TYPE)",
      "category": "EVENT_TYPE",
      "relationships": null
    }
  }
}

I expected to get an entity

urn:li:eventDerivedMetric:CLICKTHROUGH_TEST_123

under the

relationships

prop

this would be in

GmsGraphQLEngine.java