Alexander Korotkov escribió: > On Fri, Dec 20, 2013 at 11:43 PM, Alvaro Herrera > <alvhe...@2ndquadrant.com>wrote: > > > Heikki Linnakangas escribió: > > > > > I believe that eliminates all encodings in the Simple family, as > > > well as PForDelta, and surprisingly also Rice encoding. For example, > > > if you have three items in consecutive offsets, the differences > > > between them are encoded as 11 in rice encoding. If you remove the > > > middle item, the encoding for the next item becomes 010, which takes > > > more space than the original. > > > > I don't understand this. If you have three consecutive entries, and the > > differences between them are 11, you need to store two 11s. But if you > > have two items, you only need to store 010 once. So the difference is > > larger, but since you need to store only one of them then overall it's > > still shorter than the original. No? > > I believe Heikki mean both differences are encoded as 11, each one is 1.
Oh, that sucks (or it's great, depending on perspective). -- Álvaro Herrera http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
