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Posted to user@ignite.apache.org by Guilherme Melo <gu...@gmelo.org> on 2017/07/13 13:21:12 UTC
Group By on Scan query
Hello,
I have been reading, and I have not figured out if it is possible to
perforn agregation on a scan query, I am aware I can use the stream api to
do a few things once I've gotten the results, but I was wondering if there
was some internal mechanism to do this, like a reduce step.
Cheers,
Guilherme Melo
www.gmelo.org
Re: Group By on Scan query
Posted by Guilherme Melo <gu...@gmail.com>.
Thank you Andrei I'll give that a try.
On 14 Jul 2017 12:56 a.m., "Andrey Mashenkov" <an...@gmail.com>
wrote:
Hi Guilherme,
ScanQuery doesn't supports aggregation.
You can try to use SqlFieldsQuery for it or run map-reduce task that will
run local ScanQueries on map phase.
On Thu, Jul 13, 2017 at 4:21 PM, Guilherme Melo <gu...@gmelo.org> wrote:
> Hello,
> I have been reading, and I have not figured out if it is possible to
> perforn agregation on a scan query, I am aware I can use the stream api to
> do a few things once I've gotten the results, but I was wondering if there
> was some internal mechanism to do this, like a reduce step.
>
> Cheers,
>
> Guilherme Melo
> www.gmelo.org
>
--
Best regards,
Andrey V. Mashenkov
Re: Group By on Scan query
Posted by Andrey Mashenkov <an...@gmail.com>.
Hi Guilherme,
ScanQuery doesn't supports aggregation.
You can try to use SqlFieldsQuery for it or run map-reduce task that will
run local ScanQueries on map phase.
On Thu, Jul 13, 2017 at 4:21 PM, Guilherme Melo <gu...@gmelo.org> wrote:
> Hello,
> I have been reading, and I have not figured out if it is possible to
> perforn agregation on a scan query, I am aware I can use the stream api to
> do a few things once I've gotten the results, but I was wondering if there
> was some internal mechanism to do this, like a reduce step.
>
> Cheers,
>
> Guilherme Melo
> www.gmelo.org
>
--
Best regards,
Andrey V. Mashenkov