Re: PGXS: REGRESS_OPTS=--load-language=plpgsql

On Thu, Feb 18, 2010 at 11:38 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Takahiro Itagaki <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp> writes:
>> David Fetter <david(at)fetter(dot)org> wrote:
>>> support both pre-9.0 and post-9.0 PostgreSQLs.  David Wheeler has
>>> suggested that we special-case PL/pgsql for 9.0 and greater, as it's
>>> in template0, where those tests are based.
>
>> +1 for the CREATE LANGUAGE IF NOT EXISTS behavior.
>
>> The regression test in the core is targeting only its version,
>> but some external projects have version-independent tests.
>
> I think it's more like "are under the fond illusion that their tests are
> version-independent".  Are we going to back out the next incompatible
> change we choose to make as soon as somebody notices that it breaks a
> third-party test case?  I don't think so.  Let me point out that
> choosing to install plpgsql by default has already broken "--single"
> restore of practically every pg_dump out there.  Nobody batted an eye
> about that.  Why are we suddenly so concerned about its effects on
> unnamed test suites?

I am still of the opinion that changing this was a bad idea for
exactly this reason. We could perhaps ameliorate this problem by
implementing CREATE OR REPLACE for languages and emitting that
instead; then the command in the dump would be a noop.

...Robert