Re: Create a separate test file for exercising system views

On Mon, Jan 30, 2017 at 6:02 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> In connection with the "pg_hba_file_settings view patch" thread, I was
> wondering where we could logically insert a regression test case for that
> view. I realized that there is no natural home for it among the existing
> regression tests, because it's not really connected to any SQL language
> feature. The same is true for a number of other built-in views, and
> unsurprisingly, most of them are not exercised anywhere :-(.
>
> Accordingly, I propose creating a new regression test file whose charter
> is to exercise the SRFs underlying system views, as per attached.
> I don't think we desperately need new tests for views that expand to
> simple SQL, but these test cases correspond directly to code coverage
> for C functions, so they seem worthwhile.
>
> I did not do anything about testing the various pg_stat_xxx views.
> Those could be added later, or maybe they deserve their own home.
> (In many cases, those would need something smarter than the basic
> count(*) technique used here, because the C functions are invoked
> in the view's SELECT list not in FROM, so the planner would throw
> away those calls.)
>
> Comments/objections?

Nice idea to group those tests in the same file. I am not noticing any
issues with the patch proposed.
--
Michael