Re: Sample rate added to pg_stat_statements

> To summarize the results of all benchmarks, I compiled them into a table:
Thanks for compiling the benchmark data above.

The main benefit of this patch will be to give the user
a toggle if they are observing high spinlock contention
due to pg_stat_statements which will likely occur
on larger machines.

I also did not see this thread [1] mentioned in the thread above,
but one of the reasons pg_stat_statements.track_planning
was turned off by default was due to the additional spinlock
acquire to track the planning stats. Bringing this up as sample_rate
might also be beneficial as well if a user decides to track planning.

Regards,

Sami

[1] https://www.postgresql.org/message-id/flat/2895b53b033c47ccb22972b589050dd9@EX13D05UWC001.ant.amazon.com