Re: [Discussion] Code generation in carbon result preparation

Posted by Jacky Li on Oct 12, 2016; 4:03pm
URL: http://apache-carbondata-dev-mailing-list-archive.168.s1.nabble.com/Discussion-Code-generation-in-carbon-result-preparation-tp1792p1816.html

Hi Vishal,

Which part of the preparation are you considering? The column stitching in the executor side?

Regards,
Jacky

> 在 2016年10月12日，下午9:24，Kumar Vishal <[hidden email]> 写道：
>
> Hi All,
> Currently we are preparing the final result row wise, as number of columns
> present in project list(80 columns) is high mainly measure column or no
> dictionary column there are lots of cpu cache invalidation is happening and
> this is resulting to slower the query performance.
>
> *I can think of two solutions for this problem.*
> *Solution 1*. Fill column data vertically, currently it is horizontally(It
> may not solve all the problem)
> *Solution 2*. Use code generation for result preparation.
>
> This is an initially idea.
>
> -Regards
> Kumar Vishal