Re: pg_upgrade --check fails to warn about abstime

On Wed Sep 20, 2023 at 12:58 PM CDT, Alvaro Herrera wrote:
> On 2023-Sep-20, Tristan Partin wrote:
>
> > > +/*
> > > + * check_for_removed_data_type_usage
> > > + *
> > > + *        similar to the above, but for types that were removed in 12.
> > > + */
> > > +static void
> > > +check_for_removed_data_type_usage(ClusterInfo *cluster, const char *datatype)
> > 
> > Seems like you could make this more generic instead of hardcoding version
> > 12, and then you could use it for any future removed types as well.
>
> Yeah, I thought about that, and then closed that with "we can whack it
> around when we need it".  At this point I imagine there's very few other
> datatypes we can remove from the core server, if any.

Makes complete sense to me. Patch looks good to me with one comment.

> +                pg_fatal("Your installation contains the \"%s\" data type in user tables.\n"
> +                                 "Data type \"%s\" has been removed in PostgreSQL version 12,\n"
> +                                 "so this cluster cannot currently be upgraded.  You can drop the\n"
> +                                 "problem columns, or change them to another data type, and restart\n"
> +                                 "the upgrade.  A list of the problem columns is in the file:\n"
> +                                 "    %s", datatype, datatype, output_path);

I would wrap the second \"%s\" in commas.

> Data type, "abstime", has been...

Maybe also add a "The" to start that sentence to make it less terse. Up 
to you.

-- 
Tristan Partin
Neon (https://neon.tech)