Removing pg_auth_members.grantor (was Grantor name gets lost when grantor role dropped)

Tom Lane wrote:
> Alvaro Herrera <alvherre(at)commandprompt(dot)com> writes:

> >> Why is it that we record grantor at all? One could argue that granting
> >> membership in a role is done on behalf of that role and there's no real
> >> need to remember exactly who did it.
>
> > I think you should ask Stephen Frost about that -- added to CC.
>
> > If the grantor bit is not important, then what we should do is just omit
> > emitting the GRANTED BY part in pg_dumpall, which fixes this report.
>
> It's at least something we should reflect on before sweating hard to
> make it work...

I took a look, and concluded that the only bit of code that uses the
grantor at all is pg_dumpall.

Does this means we can remove it altogether? In back branches, we would
take out the pg_dumpall code.

--
Alvaro Herrera http://www.CommandPrompt.com/
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