Bug with facets sorting alias by datetime

Users Dgraph
1

Hi. I think there is a bug when sorting facets using alias.

Take a look, this:

{
  q(func: uid(0x8f58)){
    normal: classificacoes @facets(orderasc: _created_time) {
      uid
      descricao
    }
    facet_alias: classificacoes @facets(created: _created_time, orderasc: created) {
      uid
      descricao
    }
  }
}

Yields this:

{
  "data": {
    "q": [
      {
        "normal": [
          {
            "uid": "0x8d92",
            "descricao": "Normal",
            "normal|_created_time": "2018-09-07T18:40:34.755Z"
          },
          {
            "uid": "0x8d7e",
            "descricao": "Alerta",
            "normal|_created_time": "2018-09-07T18:52:17.057Z"
          },
          {
            "uid": "0x8d83",
            "descricao": "Problema",
            "normal|_created_time": "2018-09-07T18:52:32.778Z"
          }
        ],
        "facet_alias": [
          {
            "uid": "0x8d7e",
            "descricao": "Alerta",
            "created": "2018-09-07T18:52:17.057Z"
          },
          {
            "uid": "0x8d83",
            "descricao": "Problema",
            "created": "2018-09-07T18:52:32.778Z"
          },
          {
            "uid": "0x8d92",
            "descricao": "Normal",
            "created": "2018-09-07T18:40:34.755Z"
          }
        ]
      }
    ]
  },
  "extensions": {
    "server_latency": {
      "parsing_ns": 31733,
      "processing_ns": 826947,
      "encoding_ns": 1007517
    },
    "txn": {
      "start_ts": 226780,
      "lin_read": {
        "ids": {
          "1": 246678
        }
      }
    }
  }
}

Looks like its converting to string first and sorting by the string result, and not by the datetime value.