Mark Kirkwood <markir@paradise.net.nz> writes:
> Right - in principle it is not that difficult to add (once I have the
> machinery for the cost limiter going properly that is). I thinking we
> could either:
> 1. Add hooks to count work_mem allocations where they happen, or
> 2. Scan the plan tree and deduce how many work_mem allocations there
> will be.
The problem with this is that many of the cost models depend on
work_mem, so you can't simply arbitrarily alter the setting
after-the-fact. At least not if you don't want to kill performance.
regards, tom lane