Support lists in query variables (Dgraph's GraphQL Variable)

srfrog commented :

This is similar to #2272 but it’s in fact a different feature. The variable array (Gql) is not the same as the argument list. We would need to add support for arrays and convert them into argument list for this to work.

The uid list is not the same as the array in the variable. This is how it works:

{
   //            .... argument list ....
   me(func: uid( "0x1878bd", "0x237702" )) {
    uid
    name@en
    director.film @filter(lt(initial_release_date, "1980-01-01"))  {
      initial_release_date
      name@en
    }
  }
}