Re: Statistics Import and Export

>
> +--- error: relation is wrong type
> +SELECT pg_catalog.pg_restore_relation_stats(
> + 'relation', 0::oid,
> + 'relpages', 17::integer,
> + 'reltuples', 400.0::real,
> + 'relallvisible', 4::integer);
>
> Why do you need to specify all the stats (relpages, reltuples, etc)?
> To exercise this you could just do:
> select pg_catalog.pg_restore_relation_stats('relation', 0::oid);
>

In the above case, it's historical inertia in that the pg_set_* call
required all those parameters, as well as a fear that the code - now or in
the future - might evaluate "can anything actually change from this call"
and short circuit out before actually trying to make sense of the reg_class
oid. But we can assuage that fear with just one of the three stat
parameters, and I'll adjust accordingly.

> Since I haven't been following along with this feature development, I
> don't think I can get comfortable enough with all of the changes in
> this test diff to commit them. I can't really say if this is the set
> of tests that is representative and sufficient for this feature.
>

That's fine, I hadn't anticipated that you'd review this patch, let alone
commit it.

> If you agree with me that the failure tests could be shorter, I'm
> happy to commit that, but I don't really feel comfortable assessing
> what the right set of full tests is.

The set of tests is as short as I feel comfortable with. I'll give the
parameter lists one more pass and repost.