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From "Paul Joseph Davis (JIRA)" <>
Subject [jira] Commented: (COUCHDB-415) View sorting
Date Sun, 02 Aug 2009 07:42:14 GMT


Paul Joseph Davis commented on COUCHDB-415:

Just realized that my old patch may not be the entire answer to this. For reference, the old
patch only allows specifying forward or reverse sorting for array key elements at definition

Nils here apparently wants to select a range of rows by endtime and then resort based on starttime.
My patch would only give "sort by end time asc, sort by startime asc within endtime keys".
Think simple Excel sort by multiple columns type sorting here.

That said, the patch itself isn't too hard.

> View sorting
> ------------
>                 Key: COUCHDB-415
>                 URL:
>             Project: CouchDB
>          Issue Type: Wish
>    Affects Versions: 0.9
>            Reporter: Nils Breunese
> I'd like to be able to sort the output of a view. I have a view that generates a list
of event objects with start and end timestamps (and some other data). I emit this data using
the end timestamp as the key, because that is what I want to use for my ?startkey=... query.
But I'd like the results to be sorted by the start timestamp. I understand this is not currently
possible using regular CouchDB views.
> The CouchDB Users mailinglist suggested to use couchdb-lucene, as that does offer the
option to sort on any indexed field. I'm trying that route now, but it feels like overkill
to add a full-text indexer to CouchDB just to be able to sort the output of my view.
> Some soundbites from the IRC channel when I brought this up:
> ----
> <rnewson> breun: jan___: in this case the data to sort on is known at map time,
so an extension to emit to support multiple keys (with separate btrees) would do it. not sure
how much effort that is, though.
> <rnewson> sorting at query time feels infeasible.
> <jan____> rnewson: I think davisp had something like that working back in the day.
i.e. alternate sort oder. davisp?
> <rnewson> jan___: I missed that, but it sounds reasonable at emit time.
> <davisp> I think its this one:
> ----
> I would love to have view sorting native in CouchDB.

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