asterix-app/src/test/resources/fuzzyjoin/dblp/040-self-join-aql.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 fuzzy1;

declare type DBLPType as open {
  id: int32, 
  dblpid: string,
  title: string,
  authors: string,
  misc: string
}

declare nodegroup group1 on nc1, nc2;

declare dataset DBLP(DBLPType) 
  primary key id on group1;

write output to nc1:'/tmp/dblp.adm';

//
// -- - Stage 3 - --
//
for $ridpair in 
    //
    // -- - Stage 2 - --
    //
    for $paperR in dataset('DBLP')
    let $tokensR :=
        for $word in counthashed-word-tokens($paperR.title)
        for $token at $i in
            //
            // -- - Stage 1 - --
            //
            for $paper in dataset('DBLP')
            for $word in counthashed-word-tokens($paper.title)
            group by $item := $word with $paper
            order by count($paper)
            return $item
        where $word = $token
        order by $i
        return $i
    for $prefix_tokenR in subset-collection(
                                $tokensR, 
                                0,
                                prefix-len(
                                    len($tokensR), 'Jaccard', .5))

    for $paperS in dataset('DBLP')
    let $tokensS :=
        for $word in counthashed-word-tokens($paperS.title)
        for $token at $i in
            //
            // -- - Stage 1 - --
            //
            for $paper in dataset('DBLP')
            for $word in counthashed-word-tokens($paper.title)
            group by $item := $word with $paper
            order by count($paper)
            return $item
        where $word = $token
        order by $i
        return $i
    for $prefix_tokenS in subset-collection(
                                $tokensS, 
                                0,
                                prefix-len(
                                    len($tokensS), 'Jaccard', .5))

    where $prefix_tokenR = $prefix_tokenS

    let $sim := similarity(
                    len(counthashed-word-tokens($paperR.title)),
                    $tokensR,
                    len(counthashed-word-tokens($paperS.title)),
                    $tokensS,
                    $prefix_tokenR,
                    'Jaccard',
                    .5)
    where $sim >= .5 and $paperR.id < $paperS.id
    group by $idR := $paperR.id, $idS := $paperS.id with $sim
    return {'idR': $idR, 'idS': $idS, 'sim': $sim[0]}

for $paperR in dataset('DBLP')
for $paperS in dataset('DBLP')
where $ridpair.idR = $paperR.id and $ridpair.idS = $paperS.id
return { 'R': { 'dblpid': $paperR.dblpid, 'title': $paperR.title },
         'S': { 'dblpid': $paperS.dblpid, 'title': $paperS.title },
         'sim': $ridpair.sim }