How to use getall with orderby in RethinkDB - rethinkdb

Question

i want to list records where id=1 between two timestamps and finally order them according to timestamp.
Mysql query something:
Select * from test
where (timestamp between 100099323 AND 1423699323) AND id=1
order by timestamp
there are more than 5 million documents in rethink database.
I tried using index for the simple mysql query:
Select * from test where id=1 order by timestamp
and Rethinkdb query is:
r.table('test').getAll(1, {index: 'id'}).orderBy({index: 'timestamp'})
but i am getting error:
RqlRuntimeError: Indexed order_by can only be performed on a TABLE or
TABLE_SLICE in:
r.table("test").getAll(1, {index: "id"}).orderBy({index: "timestamp"})
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Any suggestion?

Answer 1

RethinkDB doesn't support efficient index intersection (the Github issue to add this is #809), but you could implement this query efficiently by adding a compound index for the 'id' and 'timestamp' indexes.
If your result set is small enough, though, the orderBy could just be done completely in-memory by dropping the 'index' optarg:
r.table("test").getAll(1, {index: "id"}).orderBy("timestamp")
To do this efficiently for large result sets, you would need an index. Assuming your 'id' and 'timestamp' indexes correspond directly to fields in your rows, adding the index would look like:
r.table("test").indexCreate("id_time",
function(row) {
return [row("id"), row("timestamp")];
})
To get all the rows with id=1 and sort by the timestamp, you would then run:
r.table("test").between([1], [2], {"index": "id_time"})
.orderBy({"index": "id_time"})
In addition, going back to the original query you posted, you could query between two timestamps for id=1 by running:
r.table("test").between([1, <time 1>], [1, <time 2>], {"index": "id_time"})
.orderBy({"index": "id_time"})