| /* |
| * Description : Equi self-joins a dataset, DBLP, based on its title. |
| * DBLP has a secondary btree index on title, and given the 'indexnl' hint |
| * 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 DBLPType as closed { |
| id: int32, |
| dblpid: string, |
| title: string, |
| authors: string, |
| misc: string |
| } |
| |
| create dataset DBLP(DBLPType) partitioned by key id; |
| |
| load dataset DBLP |
| using "edu.uci.ics.asterix.external.dataset.adapter.NCFileSystemAdapter" |
| (("path"="nc1://data/dblp-small/dblp-small-id.txt"),("format"="delimited-text"),("delimiter"=":")) pre-sorted; |
| |
| create index title_index on DBLP(title); |
| |
| write output to nc1:"rttest/btree-index-join_title-secondary-equi-join_03.adm"; |
| |
| for $a in dataset('DBLP') |
| for $b in dataset('DBLP') |
| where $a.title /*+ indexnl */ = $b.title |
| return {"arec": $a, "brec": $b} |