Re: a raft of parallelism-related bug fixes

On Sat, Oct 17, 2015 at 6:17 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> It's good to have your perspective on how this can be improved, and
> I'm definitely willing to write more documentation. Any lack in that
> area is probably due to being too close to the subject area, having
> spent several years on parallelism in general, and 200+ emails on
> parallel sequential scan in particular. Your point about the lack of
> a good header file comment for execParallel.c is a good one, and I'll
> rectify that next week.

Here is a patch to add a hopefully-useful file header comment to
execParallel.c. I included one for nodeGather.c as well, which seems
to be contrary to previous practice, but actually it seems like
previous practice is not the greatest: surely it's not self-evident
what all of the executor nodes do.

--
Robert Haas
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