/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

drop  dataverse TinySocial if exists;
create  dataverse TinySocial;

use TinySocial;


create type TinySocial.EmploymentType as
{
  `organization-name` : string,
  `start-date` : date,
  `end-date` : date?
}

create type TinySocial.FacebookUserType as
 closed {
  id : int32,
  alias : string,
  name : string,
  `user-since` : datetime,
  `friend-ids` : {{int32}},
  employment : [EmploymentType]
}

create  dataset FacebookUsers(FacebookUserType) primary key id;

with  lonelyusers as (
      select element d
      from  FacebookUsers as d
      where (TinySocial.coll_count(d.`friend-ids`) < 2)
  ),
      lonelyusers2 as (
      select element d
      from  FacebookUsers as d
      where (TinySocial.coll_count(d.`friend-ids`) < 2)
  )
select element {'user1':{'id':l1.id,'name':l1.name},'user2':{'id':l2.id,'name':l2.name}}
from  lonelyusers as l1,
      lonelyusers2 as l2
where (l1.id < l2.id)
order by l1.id,l2.id
;