asterix-installer/src/main/resources/examples/mugshot/aql/left-outer-fuzzy-join.aql

/*
 * 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;

set simfunction "jaccard";
set simthreshold "0.3";

for $msg in dataset MugshotMessages
let $msgsSimilarTags := (
  for $m2 in dataset MugshotMessages
    where  $m2.tags ~= $msg.tags
      and $m2.message-id != $msg.message-id
    return $m2.message
  )
where count($msgsSimilarTags) > 0
order by count($msgsSimilarTags)
limit 10
return {
  "message" : $msg.message,
  "similarly tagged" : $msgsSimilarTags
};