Optimization: wikidata page rank query

[adsharma]

Description

./lbug -r wikidata.lbdb
Opening the database at path: wikidata.lbdb in read-only mode.
Enter ":help" for usage hints.
lbug> attach 'page_rank.lbdb' as pr (dbtype lbug); match (p:pr.page_rank), (n:wikidata_node) where p.node_id = n.qid return p.rank, n.qid, n.name order by p.rank limit 20;
┌─────────────────────────────────┐
│ result                          │
│ STRING                          │
├─────────────────────────────────┤
│ Attached database successfully. │
└─────────────────────────────────┘
(1 tuple)
(1 column)
Time: 8.65ms (compiling), 10.96ms (executing)
Error: Buffer manager exception: Unable to allocate memory! The buffer pool is full and no memory could be freed!

Even with analyze, the join order optimziation doesn't kick in.