Обсуждение: different results from plpgsql functions related to last changes in master
Hi
I did update of plpgsql_check and I see, so some functions returns different result than on older posgresql. Probably this is wanted behave, but It should be mentioned as partial compatibility break, because some regress test can be broken too.create table t(i int);
create function test_t(OUT t) returns t AS $$
begin
$1 := null;
end;
$$ language plpgsql;
select test_t();
result on PostgreSQL11 is null, on older is empty record "()"
Regards
Pavel
Pavel Stehule <pavel.stehule@gmail.com> writes:
> I did update of plpgsql_check and I see, so some functions returns
> different result than on older posgresql. Probably this is wanted behave,
> but It should be mentioned as partial compatibility break, because some
> regress test can be broken too.
This is mentioned in the relevant commit message (4b93f5799):
... A lesser, but still real, annoyance is that ROW format cannot
represent a true NULL composite value, only a row of per-field NULL
values, which is not exactly the same thing.
In the case you're showing here, a true NULL got changed into ROW(NULL)
by the old code, but that no longer happens.
regards, tom lane
Re: different results from plpgsql functions related to last changesin master
От
Pavel Stehule
Дата:
2018-02-18 17:48 GMT+01:00 Tom Lane <tgl@sss.pgh.pa.us>:
Pavel Stehule <pavel.stehule@gmail.com> writes:
> I did update of plpgsql_check and I see, so some functions returns
> different result than on older posgresql. Probably this is wanted behave,
> but It should be mentioned as partial compatibility break, because some
> regress test can be broken too.
This is mentioned in the relevant commit message (4b93f5799):
... A lesser, but still real, annoyance is that ROW format cannot
represent a true NULL composite value, only a row of per-field NULL
values, which is not exactly the same thing.
In the case you're showing here, a true NULL got changed into ROW(NULL)
by the old code, but that no longer happens.
I understand, and I have not any problem with this behave. Just I am expecting so lot of people will be surprised.
Regards
Pavel
regards, tom lane