Re: Statistics Import and Export

On Sun, 2025-02-23 at 20:03 -0500, Corey Huinker wrote:
> If we're fine with giving up on appendNamedArgument() for relstats,
> wouldn't we also want to mash these into a single call?

...

> appendPQExpBuffer(out, "\t'relation', '%s'::regclass"
>                        ",\n\t'version', '%u'::integer"
>                        ",\n\t'relpages', '%d'::integer"
>                        ",\n\t'reltuples', '%s'::real"
>                        ",\n\t'relallvisible', '%d'::integer",
>                        qualname, fout->remoteVersion, rsinfo-
> >relpages,
>                        rsinfo->reltuples_str, rsinfo->relallvisible);
> appendPQExpBufferStr(out, "\n);\n");

+1.

>
>
> Part of me thinks we'd want to do the reverse - change the struct to
> store char[32] to for each of relpages, reltuples, and relallvisible,
> and then convert reltpages to int in the one place where we actually
> need to use in its numeric form, and even then only in one place.
> Conversions to and from other data types introduce the possibility,
> though very remote, of the converted-and-then-unconverted value being
> cosmetically different from what we got from the server, and if down
> the road we're dealing with more complex data types, those
> conversions might become significant.

That's a good point but let's avoid excessive redundancy in the
structures. Adding a few fields to RelStatsInfo should be enough.

Regards,
    Jeff Davis