Facet encoding breaks with loop:false

Issues Dgraph
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2

kesor commented :

When a @recurse query stops because of loop:false, it DOES return the facets but DOES NOT return the predicate that is associated with these facets.

Example:

{
  set {
    _:a <name> "A" .
    _:a <dgraph.type> "Example" .
    _:b <name> "B" .
    _:b <dgraph.type> "Example" .
    _:a <connects> _:b  (number=1) .
    _:b <connects> _:a  (number=7) .
  }
}

query {
  example(func:type("Example"))
  @recurse {
    name
    connects @facets
  }
}

Notice how example[0].connects[0] is missing connects[] but has the facets for that predicate!

{
  "data": {
    "example": [
      {
        "name": "A",
        "connects": [
          {
            "name": "B",
            "connects|number": {
              "0": 7
            }
          }
        ],
        "connects|number": {
          "0": 1
        }
      }

On the other hand, when loop:true is enabled (with depth) it appears that the bug is not there.

query {
  example(func:type("Example"))
  @recurse(loop:true,depth:4) {
    name
    connects @facets
  }
}

{
  "data": {
    "example": [
      {
        "name": "A",
        "connects": [
          {
            "name": "B",
            "connects": [
              {
                "name": "A",
                "connects": [
                  {
                    "name": "B"
                  }
                ],
                "connects|number": {
                  "0": 1
                }
              }
            ],
            "connects|number": {
              "0": 7
            }
          }
        ],
        "connects|number": {
          "0": 1
        }
      },