Re: [HACKERS] path toward faster partition pruning

Hi Amit,

On 03/27/2018 06:42 AM, Amit Langote wrote:
> I have managed to make the recursion go away in the attached updated
> version. I guess that's the result of employing the idea of a "output
> register" for individual pruning steps as mentioned in Robert's email
> upthread where he detailed the "pruning steps" approach [1].
>
> With the new patch, pruning steps for arguments of, say, an OR clause are
> not performed recursively. Instead, each pruning step is performed
> independently and its output is stored in a slot dedicated to it. Combine
> steps are always executed after all of the steps corresponding to its
> arguments have been executed. That's ensured by the way steps are allocated.
>

Running v41 with "partition_prune" under valgrind gives the attached report.

Best regards,
Jesper