Andres Freund <andres@anarazel.de> writes:
> I can see basically three sensible routes to go for v11 (before we
> improve further):
> 1) Leave it enabled, as currently.
> 2) Disable it by default in v11, leave it enabled in master.
> 3) Increase the costs substantially, so it triggers in far fewer
> cases. Those would be too high for cases that want to benefit fully,
> but would reduce the risk - although it also probably makes it
> harder to easily hit problematic cases.
I'd go with #2, personally. It does seem that the costing needs work,
but it's not clear to me that we know what to change, so it's kinda
late to propose #3 for v11.
regards, tom lane