| From: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> |
|---|---|
| To: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Chapman Flack <chap(at)anastigmatix(dot)net>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: lazy detoasting |
| Date: | 2018-04-25 11:50:50 |
| Message-ID: | 877eovbjc3.fsf@news-spur.riddles.org.uk |
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| Lists: | pgsql-hackers |
>>>>> "Andrew" == Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> writes:
>>>>> "Peter" == Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> writes:
>> On 4/11/18 11:33, Tom Lane wrote:
>>> (Wanders away wondering what Peter has done about toasted parameter
>>> values for procedures in general ...)
Peter> I'm not sure. How can a procedure have a toasted parameter value?
Andrew> do $$ declare a text; begin select f1.a into a from f1; call p1(a); end; $$;
And behold:
do $$
declare a text;
begin
select f1.a into a from f1;
delete from f1;
commit;
perform pg_sleep(10); -- vacuum f1 in another session while it sleeps
call p1(a);
end; $$;
INFO: a: (t,t,f,"missing chunk number 0",,)
(p1 in this case is using toast_item_detail() from the module I just put
up at https://github.com/RhodiumToad/pg-toastutils to examine the value)
--
Andrew (irc:RhodiumToad)
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