Sorry, I was wrong. For public user mapping userid is 0 (InvalidOid), which
is returned as is in UserMapping object. I confused InvalidOid with -1.
Sorry for the confusion.

On Tue, Feb 9, 2016 at 10:21 AM, Tom Lane <> wrote:

> Ashutosh Bapat <> 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
> > 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

Best Wishes,
Ashutosh Bapat
EnterpriseDB Corporation
The Postgres Database Company

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