| From: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Sergei Kornilov <sk(at)zsrv(dot)org>, Vik Fearing <vik(dot)fearing(at)2ndquadrant(dot)com>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Magnus Hagander <magnus(at)hagander(dot)net>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com>, Euler Taveira de Oliveira <euler(at)timbira(dot)com(dot)br>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Dave Page <dpage(at)pgadmin(dot)org> |
| Subject: | Re: New function pg_stat_statements_reset_query() to reset statistics of a specific query |
| Date: | 2018-12-15 15:21:19 |
| Message-ID: | 4cf51ccb-7a38-db4b-efe6-6c481a0576d3@2ndquadrant.com |
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| Lists: | pgsql-hackers |
On 14/12/2018 19:44, Robert Haas wrote:
> I'm showing up very late to the party here, but I like option 1 best.
> I feel like the SQL standard has a pretty clear idea that NULL is how
> you represent a value is unknown, which shows up in a lot of places.
> Deciding that we're going to use a different sentinel value in this
> one case because NULL is a confusing concept in general seems pretty
> strange to me.
[The difference between #1 and #4 is whether "any" is represented as
NULL or 0.]
An example:
select pg_stat_statements_reset(
10,
(select min(oid) from pg_database where datname like 'test%'),
1234);
(This is obviously a weird example, but it illustrates the
language-theoretic point.)
If you have no matching databases, under #1 this would then apply to all
databases. Under #4 it would not.
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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