On Sun, Nov 18, 2012 at 4:54 PM, Alexander Korotkov <aekorotkov@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.