Gregory Stark <stark@enterprisedb.com> writes:
> I think a better way to get a real "percentage done" would be to add a method
> to each node which estimates its percentage done based on the percentage done
> its children report and its actual and expected rows and its costs.
You can spend a week inventing some complicated method, and the patch
will be rejected because it adds too much overhead. Anything we do here
has to be cheap enough that no one will object to having it turned on
all the time --- else it'll be useless exactly when they need it.
regards, tom lane