On Tue, Dec 4, 2012 at 9:34 PM, Robert Haas <robertmh...@gmail.com> wrote:
> On Sun, Nov 18, 2012 at 4:54 PM, Alexander Korotkov > <aekorot...@gmail.com> wrote: > > Patch completely changes storage in posting lists and leaf pages of > posting > > trees. It uses varbyte encoding for BlockNumber and OffsetNumber. > > BlockNumber are stored incremental in page. Additionally one bit of > > OffsetNumber is reserved for additional information NULL flag. To be > able to > > find position in leaf data page quickly patch introduces small index in > the > > end of page. > > This sounds like it means that this would break pg_upgrade, about > which I'm not too keen. Ideally, we'd like to have a situation where > new indexes have additional capabilities, but old indexes are still > usable for things that they could do before. I am not sure whether > that's a realistic goal. This means to have two versions of code which deals with posting trees and lists. For me it seems unlikely we have resources for maintenance of this. ------ With best regards, Alexander Korotkov.
