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From Glynn Bird <glynn.b...@gmail.com>
Subject Re: _all_docs collation
Date Thu, 26 Mar 2020 09:45:03 GMT
It's not something I was aware of, but it's certainly a known "feature",
documented here:
https://docs.couchdb.org/en/stable/ddocs/views/collation.html#all-docs

(probably because all keys are strings in all_docs, whereas they can be all
sorts of mixed types with a view, and ascii collation would be faster with
that assumption)

On Thu, 26 Mar 2020 at 07:12, Garren Smith <garren@apache.org> wrote:

> Hi Everyone,
>
> While working on the Mango implementation for FDB, I've noticed that
> _all_docs has some weird
> ordering collation. If you do something like GET /db/_all_docs?startkey={}
> it will return all the documents even though in view collation an object is
> ordered after strings. The reason I've noticed this is that in the
> pouchdb-find tests we have a few tests that check that {selector: {_id:
> {$gt: {}}} return all the docs in the database [0].
>
> This ordering feels wrong to me, but I'm guessing its been around for a
> while. Currently for _all_docs on FDB, we have it that if you did the above
> startkey query, it would not return any documents as we are following the
> view collation ordering.
>
> I want to know whether we should keep the old _all_docs ordering or rather
> standardize on view collation ordering everywhere?
>
> I would prefer we change it, but I'm not sure the implications of that for
> client libraries and users.
> Changing it would be a breaking change, but since 4.0 is going to be a lot
> of breaking change I think this would be our best chance to do this.
>
> Cheers
> Garren
>
>
>
> [0]
>
> https://github.com/nolanlawson/pouchdb-find/commit/e1ca2e2d18041f05a3d19bce4254f4d7b349ad20
>

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