> The whole point of the hint bits is that it's in the same place as the data.
Yes, but the hint bits are currently causing us trouble on several
features or potential features:
* page-level CRC checks
* eliminating vacuum freeze for cold data
* index-only access
* replication
* this patch
* etc.
At a certain point, it's worth the trouble to handle them differently
because of the other features that enables or makes much easier.
-- -- Josh Berkus PostgreSQL Experts Inc.
http://www.pgexperts.com