examples.mugshot.aql.left-outer-join-aggr.aql Maven / Gradle / Ivy

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/*
 * 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.
 */
use dataverse TinySocial;

for $user in dataset MugshotUsers
let $result := {
    "uname" : $user.name,
    "msg-length" : avg(
        for $message in dataset MugshotMessages
        where $message.author-id = $user.id
        return string-length($message.message)
      )
  }
order by $result.msg-length desc
limit 10
return $result;