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From Jens Rantil <jens.ran...@tink.se>
Subject Re: Issue with ALLOW FILTERING
Date Wed, 06 Aug 2014 08:46:42 GMT
Sylvain,

Your answer was what I was hoping for - that means it's not impossible to
solve ;)

I'll keep an eye on the issue and in case I have the time I will dig into
some code.

Thanks,
Jens


On Wed, Aug 6, 2014 at 10:03 AM, Sylvain Lebresne <sylvain@datastax.com>
wrote:

> On Wed, Aug 6, 2014 at 9:41 AM, Jens Rantil <jens.rantil@tink.se> wrote
>
>>
>> I'm struggling to see any reason for it not being supported.
>>
>
> The time to implement it, plus a bunch of internal implementation reasons
> that makes it not as trivial to support as you seem to suggest it is (of
> course, this is open source, you are welcome to have a look if that's a
> particular itch you want to scratch; there is even a JIRA ticket:
> https://issues.apache.org/jira/browse/CASSANDRA-6377).
>
>
>>
>> Or is it considered implementation specific under what circumstances
>> ALLOW FILTERING can be used?
>>
>
> Currently, it kind of is. ALLOW FILTERING allows to execute "some" queries
> that couldn't be otherwise, but not everything. Again, things that are not
> supported are not mainly for implementation reasons, nothing more, and that
> may/will change in the future. That said, I'm not saying documentation
> cannot be improved (though I'm not sure having the doc saying "this doesn't
> work" would be a lot more helpful than trying it and having the
> implementation saying "this doesn't work").
>
> --
> Sylvain
>
>
>>
>> Thanks,
>> Jens
>>
>>
>> On Tue, Aug 5, 2014 at 8:11 PM, Sávio S. Teles de Oliveira <
>> savio.teles@cuia.com.br> wrote:
>>
>>> You need to create an index on attribute *c.*
>>>
>>>
>>> 2014-08-05 9:24 GMT-03:00 Jens Rantil <jens.rantil@tink.se>:
>>>
>>> Hi,
>>>>
>>>> I'm having an issue with ALLOW FILTERING with Cassandra 2.0.8. See a
>>>> minimal example here:
>>>> https://gist.github.com/JensRantil/ec43622c26acb56e5bc9
>>>>
>>>> I expect the second last to fail, but the last query to return a single
>>>> row. In particular I expect the last SELECT to first select using the
>>>> clustering primary id and then do filtering.
>>>>
>>>> I've been reading
>>>> https://cassandra.apache.org/doc/cql3/CQL.html#selectStmt "ALLOW
>>>> FILTERING" and can't wrap my head around why this won't work.
>>>>
>>>> Could anyone clarify this for me?
>>>>
>>>> Thanks,
>>>> Jens
>>>>
>>>
>>>
>>>
>>> --
>>> Atenciosamente,
>>> Sávio S. Teles de Oliveira
>>> voice: +55 62 9136 6996
>>> http://br.linkedin.com/in/savioteles
>>>  Mestrando em Ciências da Computação - UFG
>>> Arquiteto de Software
>>> CUIA Internet Brasil
>>>
>>
>>
>

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