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From Ildar Absalyamov <ildar.absalya...@gmail.com>
Subject Re: Histograms and statistics on Asterix
Date Fri, 18 Dec 2015 18:18:09 GMT
Hi Wail,

I do have some doc which can give you some idea of how stats collection will work https://docs.google.com/document/d/12aP8Pzp68b_HxJe-svFmG9dHFX6zliGw-ErNSd_Av3I/edit?usp=sharing
<https://docs.google.com/document/d/12aP8Pzp68b_HxJe-svFmG9dHFX6zliGw-ErNSd_Av3I/edit?usp=sharing>.
But it does not describe the statistical synopsis format. We were planning to use wavelets
instead to histograms for these LSM-based statistics. Let me know if you want to know more
on how wavelets work and why they should be used.

> On Dec 18, 2015, at 07:23, Wail Alkowaileet <wael.y.k@gmail.com> wrote:
> 
> Good to know.
> Is there any type of design document ?
> 
> P.S. Sattam told me that there was some sort of a comparative study shows
> the difference in performance of open vs. closed types. Where can I find it?
> 
> Thanks!
> 
> On Thu, Dec 17, 2015 at 9:16 PM, Mike Carey <dtabass@gmail.com> wrote:
> 
>> Ildar is working on that (camping on the LSM lifecycle) and Wenhai is
>> doing some work on histograms that's intended for in-flight use during
>> query processing (to do dynamic partitioning, e.g., during parallel sorts
>> and joins).
>> 
>> 
>> On 12/17/15 1:53 AM, Wail Alkowaileet wrote:
>> 
>>> Hi Devs,
>>> 
>>> I want to ask if there's any on going work on building histograms and
>>> stats
>>> for Asterix ?
>>> 
>> 
>> 
> 
> 
> -- 
> 
> *Regards,*
> Wail Alkowaileet

Best regards,
Ildar


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