On 22.10.2013 20:27, Peter Geoghegan wrote:
> On Tue, Oct 22, 2013 at 9:55 AM, Heikki Linnakangas
> <hlinnakangas@vmware.com> wrote:
>> I propose that we use the same approach I used with GiST, and add a flag to
>> the page header to indicate "the downlink hasn't been inserted yet". When
>> insertion (or vacuum) bumps into a flagged page, it can finish the
>> incomplete action by inserting the downlink.
>
> Sounds very reasonable, but I'm interested in how you intend to
> structure things, given this sounds like what could loosely be called
> btree private state. I may also need to use a flag bit for something
> that is of interest to the btree code alone.
I may be missing something, but there are already plenty of b-tree
specific flags. See BTP_* in nbtree.h. I'll just add another to that list.
- Heikki