Heikki Linnakangas wrote:

That's a clever trick, but I can't help thinking we really should have an explicit field in the page header to indicate what kind of a page it is. It would make life simpler for any external tools that want to peek into pages, including migration utilities after a release or two. We've also been talking about setting hint bits and doing some kind of retail vacuuming in bgwriter with HOT. To do that, we need to identify heap pages in the bgwriter. While heap pages can currently be identified by the fact that they don't have a special area, it feels hackish, and we might want to do something like that for index pages too in the future.

We now have a 16-bit pd_flags field in the page header. We could use a few bits from that.


or add one extra field


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