Unhandled pb.node expand with parent edge

[danielmai]

What version of Dgraph are you using?

v1.0.16. This does NOT happen on master.

Have you tried reproducing the issue with latest release?

Yes (v1.0.16)

Steps to reproduce the issue (command/config used to run Dgraph).

1. Run Dgraph cluster running v1.0.16
2. Set schema:

name: string @index(term) .
age: int .
friend: uid .

4. Run query and get error response:

{
  q(func: anyofterms(name, "Michael")) {
    uid
    name
    friend {
      uid
      expand(_all_)
    }
  }
}

{
  "name": "t",
  "url": "http://localhost:8080/query?debug=true",
  "errors": [
    {
      "code": "ErrorInvalidRequest",
      "message": ": Unhandled pb.node expand with parent friend"
    }
  ]
}

Remove expand(_all_) from the query and get an empty response:

{
  q(func: anyofterms(name, "Michael")) {
    uid
    name
    friend {
      uid
    }
  }
}

{
  "data": {
    "q": []
  }
}

Expected behaviour and actual result.

An empty query response should be returned instead of an error.

[campoy]

Hey, @martinmr

Since you're already working on expand, could you have a look at this one?

[martinmr]

Fixed.