Re: trigger example for plsample

On Wed, Apr 6, 2022 at 5:44 PM Mark Wong <markwkm(at)gmail(dot)com> wrote:
>
> On Thu, Mar 10, 2022 at 06:36:44PM -0500, Chapman Flack wrote:
> > On 03/02/22 15:12, Mark Wong wrote:
> >
> > > I've attached v2, which reduces the output:
> > >
> > > * Removing the notices for the text body, and the "compile" message.
> > > * Replaced the notice for "compile" message with a comment as a
> > > placeholder for where a compiling code or checking a cache may go.
> > > * Reducing the number of rows inserted into the table, thus reducing
> > > the number of notice messages about which code path is taken.
> >
> > I think the simplifying assumption of a simple interpreted language
allows
> > a lot more of this code to go away. I mean more or less that whole first
> > PG_TRY...PG_END_TRY block, which could be replaced with a comment saying
> > something like
> >
> > The source text may be augmented here, such as by wrapping it as the
> > body of a function in the target language, prefixing a parameter list
> > with names like TD_name, TD_relid, TD_table_name, TD_table_schema,
> > TD_event, TD_when, TD_level, TD_NEW, TD_OLD, and args, using whatever
> > types in the target language are convenient. The augmented text can be
> > cached in a longer-lived memory context, or, if the target language
uses
> > a compilation step, that can be done here, caching the result of the
> > compilation.
> >
> > That would leave only the later PG_TRY block where the function gets
> > "executed". That could stay largely as is, but should probably also have
> > a comment within it, something like
> >
> > Here the function (the possibly-augmented source text, or the result
> > of compilation if the target language uses such a step) should be
> > executed, after binding these values from the TriggerData struct to
> > the expected parameters.
> >
> > That should make the example shorter and clearer, and preserve the
output
> > tested by the regression test. Trying to show much more than that
involves
> > assumptions about what the PL's target language syntax looks like, how
its
> > execution engine works and parameters are bound, and so on, and that is
> > likely to just be distracting, IMV.
>
> I think I've applied all of these suggestions and attached a new patch.
>

Cool... I also have a look into the code. To me everything is also ok!!!

Regards,

--
Fabrízio de Royes Mello