Re: multivariate statistics v14

I apology if it's already discussed. I am new to this patch.

> Attached is v15 of the patch series, fixing this and also doing quite a
> few additional improvements:
> 
> * added some basic examples into the SGML documentation
> 
> * addressing the objectaddress omissions, as pointed out by Alvaro
> 
> * support for ALTER STATISTICS ... OWNER TO / RENAME / SET SCHEMA
> 
> * significant refactoring of MCV and histogram code, particularly 
>   serialization, deserialization and building
> 
> * reworking the functional dependencies to support more complex 
>   dependencies, with multiple columns as 'conditions'
> 
> * the reduction using functional dependencies is also significantly 
>   simplified (I decided to get rid of computing the transitive closure 
>   for now - it got too complex after the multi-condition dependencies, 
>   so I'll leave that for the future

Do you have any other missing parts in this work? I am asking because
I wonder if you want to push this into 9.6 or rather 9.7.

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp