Re: [PATCH] Use optimized single-datum tuplesort in ExecSort

On Fri, 16 Jul 2021 at 02:53, Ronan Dunklau <ronan(dot)dunklau(at)aiven(dot)io> wrote:
> Please find attached a v9 just moving the flag setting to ExecInitSort, and my
> apologies if I misunderstood your point.

I took this and adjusted a few things and ended up with the attached patch.

The changes are fairly minor. I made the bracing consistent between
both tuplesort_begin calls. I rewrote the comment at the top of
ExecSort() to make it more clear about each method used.

I also adjusted the comment down at the end of ExecSort that was
mentioning something about tuplesort_gettupleslot returning NULL.
Your patch didn't touch this, but to me, the comment just looked wrong
both before and after the changes. tuplesort_gettupleslot returns
false and sets the slot to empty when it runs out of tuples. Anyway,
I wrote something there that I think improves that.

I feel like this patch is commit-worthy now. However, I'll leave it
for a few days, maybe until after the weekend as there's been a fair
bit of interest and I imagine someone will have comments to make.

David