Re: Use %u to print user mapping's umid and userid

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com>
Cc: Etsuro Fujita <fujita(dot)etsuro(at)lab(dot)ntt(dot)co(dot)jp>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Use %u to print user mapping's umid and userid
Date: 2016-02-09 04:51:30
Message-ID: 20793.1454993490@sss.pgh.pa.us
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Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com> writes:
> Sorry to come to this late.
> The userid being printed is from UserMapping. The new API
> GetUserMappingById() allows an FDW to get user mapping by its OID. This API
> is intended to be used by FDWs to fetch the user mapping inferred by the
> core for given join between foreign relations. In such user mapping object
> , userid may be -1 for a public user mapping.

If that is actually how it works, it's broken and I'm going to insist
on a redesign. There is nothing anywhere that says that 0xffffffff
is not a valid OID.

regards, tom lane

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