[ENHANCEMENT]: Sorting using facets

[mrwunderbar666]

Use case and current behavior

Currently list predicates can only be sorted by facets if the facets are edge attributes (list of UIDs). Sorting by facet does not work if the facets are for any other kind of list predicates (strings, ints, datetime, etc)

Enhancement

Consider the following mutation

<_:node> <list_predicate> "Value 1" (weight=90) .
<_:node> <list_predicate> "Value 2" (weight=70) .
<_:node> <list_predicate> "Value 3" (weight=30) .
<_:node> <list_predicate> "Value 4" (weight=100) .

I would like to sort the values of the list predicate by the facet weight:

{
  q(func: has(list_predicate)) {
   list_predicate @facets(orderasc: weight)   
}
}

Currently, orderasc: weight is ignored. Desired output:

{
     "q": [
          {
               "list_predicate": [
                    "Value 3",
                    "Value 2",
                    "Value 1",
                    "Value 4"
               ],
               "list_predicate|weight": {
                    "0": 30,
                    "1": 70,
                    "2": 90,
                    "3": 100
               }
          }
     ]
}

Solution proposal

No response

Links to Discuss, RFC or previous Issues and PRs

No response

Links to examples and research

No response

Additional Information

No response