There is an issue with this patch. It's main purpose is the ability to
calculate values of pg_stat_statements view for a time period between
two samples without resetting pg_stat_statements being absolutely sure
that the statement was not evicted.
Such approach solves the problem for metrics with except of min and max
time values. It seems that partial reset is needed here resetting
min/max values during a sample. But overall min/max values will be lost
in this case. Does addition of resettable min/max metrics to the
pg_stat_statemets view seems reasonable here?
--
Andrei Zubkov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company