Add stats for min, max, mean, stddev times to pg_stat_statements.

Andrew Dunstan <andrew@dunslane.net>

Commit: 717f709532642f5f7756785c9be17b7ffcec8ae8
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2015-03-27T19:43:22Z
Releases: 9.5.0
Add stats for min, max, mean, stddev times to pg_stat_statements.

The new fields are min_time, max_time, mean_time and stddev_time.

Based on an original patch from Mitsumasa KONDO, modified by me. Reviewed by Petr Jelínek.

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