Re: New function pg_stat_statements_reset_query() to reset statistics of a specific query

On 2018-Nov-28, Amit Kapila wrote:

> The problem with this idea is that if someone specifies a particular
> parameter using query and the query doesn't return any parameters,
> then it can lead to inadvertent behavior.  For example, if user uses
> something like pg_stat_statements_reset(<valid_user_id>,
> <valid_db_id>, SELECT s.queryid FROM pg_stat_statements AS s WHERE
> s.query = 'SELECT $1 AS "ONE"');  now, if the query doesn't return any
> row, we will remove the stats for all queries that belong to
> (userid,dbid).  It could be surprising for some users, that's why we
> came up with option-4 where we keep the default value of parameters as
> 0.

Right, I think option 4 is a clear improvement over option 1.  I can get
behind that one.  Since not many people care to vote, I think this tips
the scales enough to that side.

Thanks for your patience.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services