Poc: pg_stat_statements with planid

Hello Hackers

As described in 
http://www.postgresql-archive.org/pg-stat-statements-HLD-for-futur-developments-td6012381.html

here is a proposal to add a planid identifier to pg_stat_statements.
The new key for the view is userid, dbid, queryid, planid.

planid is calculated using code from pg_stat_plans extension.

This proposal also include columns :
- created, 
- last_updated 
from
http://www.postgresql-archive.org/PROPOSAL-timestamp-informations-to-pg-stat-statements-td5912306.html

GUC pg_stat_statements.track_plan (boolean) default to true has been added.

Plan id values are: 
- 0 for utility statements,
- 1 for non utility statements when track_plan = false;
- value for non utility statements when track_plan = true;

I think this could be an interesting pre-requisite before adding
- sample values for the constants and parameters
- plans
- planning counters 
- ...

Feedbacks are wellcome, regarding development, planid calculation, lock
management, interest, ...

Regards
PAscal

pgss_with_planid.patch
<http://www.postgresql-archive.org/file/t348768/pgss_with_planid.patch>  
pgss_with_planid.tar
<http://www.postgresql-archive.org/file/t348768/pgss_with_planid.tar>  



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