I wrote:
> I left out the proposed regression tests because they fail in "make
> installcheck" mode, unless you've previously built and installed cube
> and seg, which seems like an unacceptable requirement to me.  I don't
> think that leaving the code untested is a good final answer, of course.
> The idea I was toying with was to create a dummy extension for testing
> purposes by means of doing a direct INSERT into pg_extension --- which
> is ugly and would only work for superusers, but the latter is true of
> "CREATE EXTENSION cube" too.  Anybody have a better idea?

I had a possibly better idea: instead of manufacturing an empty extension
with a direct INSERT, hack on the one extension that we know for sure
will be installed, namely postgres_fdw itself.  So we could do, eg,

create function foo() ...
alter extension postgres_fdw add function foo();

and then test shippability of foo() with or without having listed
postgres_fdw as a shippable extension.

This is certainly pretty ugly in its own right, but it would avoid
the maintainability hazards of an explicit INSERT into pg_extension.
So on balance it seems a bit nicer than my first idea.

                        regards, tom lane


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