Cannot display list type data using expand function

[zhuyaoyhj]

What version of Dgraph are you using?

Dgraph version   : v1.1.1
Dgraph SHA-256   : 20a10e9db316b565464e0a04cea09657eebbaea3b91460ab651997ada63243cc
Commit SHA-1     : 8994a5740
Commit timestamp : 2019-12-16 18:24:50 -0800
Branch           : HEAD
Go version       : go1.13.5

Have you tried reproducing the issue with the latest release?

yes

What is the hardware spec (RAM, OS)?

GNU/Linux， RAM:36G

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

1、data:

schema:
    languages: [string] . 
    type test {
        languages
    }
data:
    _:a <languages> "广东" (lang="zh") .
    _:a <languages> "四川" (lang="zh") .
    _:a <languages> "东北" (lang="zh") .
    _:a <languages> "普通" (lang="zh") .
    _:a <languages> "英语" (lang="en") .
    _:a <languages> "日语" (lang="jo") .
    _:a <dgraph.type> "test" .

2、use expand function to query , no languages data show.

{
    q(func:uid(2)){
        <dgraph.type>
            expand(_all_)
    }
}
or
{
    q(func:uid(2)){
        <dgraph.type>
            expand(test)
    }
}

result:

{
"data": {
"q": [
  {
    "dgraph.type": [
      "test"
    ]
  }
]
},
"extensions": {
"server_latency": {
  "parsing_ns": 326299,
  "processing_ns": 2020930,
  "encoding_ns": 197910,
  "assign_timestamp_ns": 2406986,
  "total_ns": 5633799
},
"txn": {
  "start_ts": 26
},
"metrics": {
  "num_uids": {
    "": 1,
    "dgraph.type": 1,
    "languages": 1
  }
}
}
}

3、query predicate

{
    q(func:uid(2)){
    <languages>
    <dgraph.type>
    }
}

result
{
"data": {
"q": [
  {
    "languages": [
      "广东",
      "普通",
      "东北",
      "英语",
      "四川",
      "日语"
    ],
    "dgraph.type": [
      "test"
    ]
  }
]
},
"extensions": {
"server_latency": {
  "parsing_ns": 326156,
  "processing_ns": 1671640,
  "encoding_ns": 119304,
  "assign_timestamp_ns": 3313287,
  "total_ns": 6979007
},
"txn": {
  "start_ts": 27
},
"metrics": {
  "num_uids": {
    "": 1,
    "dgraph.type": 1,
    "languages": 1
  }
}
}
}

Expected behaviour and actual result.

use expand(all) or expand(type) can query step 3 .

[martinmr]

Thanks for the report and for the steps to reproduce it. I can indeed reproduce it on my side. I'll look into this issue.

[martinmr]

I tracked down the issue to the code trying to retrieve the facets, which is not currently supported with predicates of a list type. This issue is fixed by #4267 which will be included in our next release so I am closing this one as a duplicate.