asterix-app/src/test/resources/demo_aql/local/110-self-join-dblp.aql

use dataverse demo_aql;

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) 
  partitioned by key id on group1;

write output to nc1:"/tmp/110-self-join-dblp.adm";

set simthreshold '.5f';

for $k in (
  for $i in dataset('DBLP')
  for $j in dataset('DBLP')
  where $i.title ~= $j.title
  order by $i.id, $j.id
  return {'dblp1': $i, 'dblp2': $j}
) 
where $k.dblp1.id < $k.dblp2.id
return $k