Re: polyphase merge?

Good point. I would note this issue. Thanks for the advice :).

Regards,

Don

On Wed, Feb 4, 2009 at 6:09 PM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:

>
> On Wed, 2009-02-04 at 14:42 +0800, Don Marvick wrote:
>
> > 4. any other issue needs consideration?
>
> Most attempts to improve sorting further have fallen to nothing because
> of the lack of repeatable test results. In particular, coming up with
> test cases *after* writing the code is a good way to get lost in
> discussions and have your work passed over.
>
> The best starting point is to collect a number of test cases, both
> typical and extreme cases. Do some research to show that "typical" cases
> really are that and be prepared for some expressions of reasonable
> doubt. Publish that data so test results can be objectively verified and
> then measure those cases on existing code, with various settings of
> tunable parameters.
>
> Then it will be a simple matter to prove your changes are effective in
> target cases without damaging other cases. We would also want the
> changes to work automatically without additional tunable parameters.
>
> --
> Simon Riggs www.2ndQuadrant.com
> PostgreSQL Training, Services and Support
>
>