asterix-app/src/test/resources/runtimets/queries/inverted-index-join/ngram-edit-distance.aql

/*
 * Description    : Fuzzy joins two datasets, Customers and Customers2, based on the edit-distance function of their names.
 *                  Customers has a 3-gram index on name, and we expect the join to be transformed into an indexed nested-loop join.
 * Success        : Yes
 */

drop dataverse test if exists;
create dataverse test;
use dataverse test;

create type AddressType as open {
  number: int32, 
  street: string,
  city: string
}

create type CustomerType as open {
  cid: int32, 
  name: string,
  age: int32?,
  address: AddressType?,
  interests: [string],
  children: [ { name: string, age: int32? } ]
}

create dataset Customers(CustomerType) partitioned by key cid;

create dataset Customers2(CustomerType) partitioned by key cid;

load dataset Customers 
using "edu.uci.ics.asterix.external.dataset.adapter.NCFileSystemAdapter"
(("path"="nc1://data/semistructured/co1k_olist/customer.adm"),("format"="adm"));

load dataset Customers2
using "edu.uci.ics.asterix.external.dataset.adapter.NCFileSystemAdapter"
(("path"="nc1://data/semistructured/co1k_olist/customer.adm"),("format"="adm"));

create index ngram_index on Customers(name) type ngram(3);

write output to nc1:"rttest/inverted-index-join_ngram-edit-distance.adm";

for $a in dataset('Customers')
for $b in dataset('Customers2')
where edit-distance($a.name, $b.name) <= 4 and $a.cid < $b.cid
order by $a.cid, $b.cid
return { "arec": $a, "brec": $b }