Support uid() in variables

[smkhalsa]

As discussed here, the uid function doesn't work within variables.

The following query throws an error Cannot do uid() of a variable

    {
      a as var(func: uid(0x27d0)) {}

      q(func: uid(a)) {
        solutions : solution @facets(orderasc: sortOrder, sortOrder: sortOrder) {
          uid
          expand(_all_)
          parentID: uid(a)
        }
      }
    }

[manishrjain]

What is this trying to do? Variables are essentially maps of uid -> value. So, they already have uids.

I think what you could instead do is this:

    {
      a as var(func: uid(0x27d0)) {}

      q(func: uid(a)) {
        parentId: uid
        solutions : solution @facets(orderasc: sortOrder, sortOrder: sortOrder) {
          uid
          expand(_all_)
        }
      }
    }