So basically you want to have index-only scans, but you want them to be really slow?
No Robert, i just asked him to make it optional, so that the crash safe visibility map is used only when its need is realized by the DB designer. When there is a table with no indexes/ a table where the data will be often updated/ a database where there will be a batch job together with OLTP stuff, the visibility map is just useless. So i am requesting Heikki to make it optional. I am not asking him to drop that idea, as it might be useful in read only environments.
