Peter Geoghegan <> writes:
> On Tue, Sep 6, 2016 at 6:17 AM, Tom Lane <> wrote:
>> It doesn't seem to me that this limit has anything to do with anything,
>> and the comment claiming only that it's "noncritical" isn't helping.

> You've not understood the problem at all. The only thing that's
> critical is that the calculation not fail at all, through a later
> availMem that is < 0 (i.e. a LACKMEM() condition).

I see.  The comment could do with a bit of rewriting, perhaps.

                        regards, tom lane

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