On 17/07/2017 16:57, Andres Freund wrote:
> The latter obviously isn't ready, but might make clearer what I'm
> thinking about.

It did for me, and FWIW I like this approach.

> If we were to go this route we'd have to probably move
> the callback assignment into the ExecInit* routines, and possibly
> replace the switch in ExecInitNode() with another callback, assigned in
> make_*, and implement callbacks for ExecShutdown, MultiExecProcNode etc.
> This results in a good speedup in tpc-h btw:
> master total min: 46434.897 cb min: 44778.228 [diff -3.70]

Is it v11 material or is there any chance to make it in v10?

Julien Rouhaud
http://dalibo.com - http://dalibo.org

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