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Date: Thu, 27 Jan 2011 18:12:02 +0000
Message-ID: <AANLkTimtBCDuiv_rkTPxF6QrfAa+EZxeO1_gyDeKp5O9@mail.gmail.com>
Subject: Re: erlang views
From: Robert Newson <robert.newson@gmail.com>
To: user@couchdb.apache.org
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Construct views that give you contiguous ranges for the queries you
have. Be wary of doing a query over a much larger range and filtering
out the rows you don't want, that might not scale when you have lots
of docs.

B.

On Thu, Jan 27, 2011 at 6:09 PM, Kenneth Tyler <ken@8thfold.com> wrote:
> thanks,
> ok, looks like i'll have to use something like couchbeam and process the
> view results in erlang
>
>
> ken tyler
>
> On Thu, Jan 27, 2011 at 9:27 AM, Robert Newson <robert.newson@gmail.com>w=
rote:
>
>> No, you can't do that. It's not a language limitation. A b+tree
>> supports efficient key look up. It's also efficient to find the
>> previous and next key when you do so. So couchdb provides contiguous
>> range queries too. Your query can only be completed by a different,
>> and more complicated, data structure than couchdb actually supplies.
>>
>> B.
>>
>> On Thu, Jan 27, 2011 at 5:21 PM, Kenneth Tyler <ken@8thfold.com> wrote:
>> > If i want to select documents by values in certain parts of a key and
>> ignore
>> > other parts I don't think I can do that in couch using javascript view=
s.
>> >
>> > If i have keys: a,3,b,4 -- a,2,c,1 -- a,5,b,2
>> > and i want to return keys that match a, _ , b, _ =A0(where _ means "i =
don't
>> > care")
>> > can i do that if i switch to writing the views in erlang ?
>> >
>> > i know i could deal with this by writing a new view, whose key was mad=
e
>> up
>> > of the 1 and 3rd place values,
>> > but what i want is a way to return rows from a view that contains the
>> full
>> > key by pattern matching
>> > thanks
>> > ken tyler
>> >
>>
>