Re: PL/pgSQL, RAISE and error context

Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
> 2015-01-26 14:02 GMT+01:00 Marko Tiikkaja <marko(at)joh(dot)to>:
> I am thinking, so solution

> /* if we are doing RAISE, don't report its location */
> if (estate->err_text == raise_skip_msg)
> return;

> is too simple, and this part should be fixed. This change can be done by on
> plpgsql or libpq side. This is bug, and it should be fixed.

Doing this in libpq is utterly insane. It has not got sufficient context
to do anything intelligent. The fact that it's not intelligent is exposed
by the regression test changes that the proposed patch causes, most of
which do not look like improvements.

Another problem is that past requests to change this behavior have
generally been to the effect that people wanted *more* context suppressed
not less, ie they didn't want any CONTEXT lines at all on certain
messages. So the proposed patch seems to me to be going in exactly the
wrong direction.

The design I thought had been agreed on was to add some new option to
plpgsql's RAISE command which would cause suppression of all CONTEXT lines
not just the most closely nested one. You could argue about whether the
behavior needs to be 100% backwards compatible or not --- if so, perhaps
it could be a three-way option all, none, or one line, defaulting to the
last for backwards compatibility.

regards, tom lane