Re: [WIP] Effective storage of duplicates in B-tree index.

Hi Anastasia,

On 2/18/16 12:29 PM, Anastasia Lubennikova wrote:
> 18.02.2016 20:18, Anastasia Lubennikova:
>> 04.02.2016 20:16, Peter Geoghegan:
>>> On Fri, Jan 29, 2016 at 8:50 AM, Anastasia Lubennikova
>>> <a.lubennikova@postgrespro.ru>  wrote:
>>>> I fixed it in the new version (attached).
>>
>> Thank you for the review.
>> At last, there is a new patch version 3.0. After some refactoring it
>> looks much better.
>> I described all details of the compression in this document
>> https://goo.gl/50O8Q0 (the same text without pictures is attached in
>> btc_readme_1.0.txt).
>> Consider it as a rough copy of readme. It contains some notes about
>> tricky moments of implementation and questions about future work.
>> Please don't hesitate to comment it.
>>
> Sorry, previous patch was dirty. Hotfix is attached.

This looks like an extremely valuable optimization for btree indexes but 
unfortunately it is not getting a lot of attention.  It still applies 
cleanly for anyone interested in reviewing.

It's not clear to me that you answered all of Peter's questions in [1].  I understand that you've provided a README but
itmay not be clear if 
 
the answers are in there (and where).

Also, at the end of the README it says:

13. Xlog. TODO.

Does that mean the patch is not yet complete?

Thanks,
-- 
-David
david@pgmasters.net

[1] 
http://www.postgresql.org/message-id/CAM3SWZQ3_PLQCH4w7uQ8q_f2t4HEseKTr2n0rQ5pxA18OeRTJw@mail.gmail.com