Re: TRUNCATE on foreign tables

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Hello,

The attached patch is the revised version of TRUNCATE on foreign tables.

Definition of the callback is revised as follows:

typedef void (*ExecForeignTruncate_function) (List *frels_list,
                                             bool is_cascade,
                                             bool restart_seqs);

The "frels_list" is a list of foreign tables that are connected to a partic=
ular
foreign server, thus, the server-id pulled out by foreign tables id should =
be
identical for all the relations in the list.
Due to the API design, this callback shall be invoked for each foreign serv=
er
involved in the TRUNCATE command, not per table basis.

The 2nd and 3rd arguments also informs FDW driver other options of the
command. If FDW has a concept of "cascaded truncate" or "restart sequence",
it can adjust its remote query. In postgres_fdw, it follows the manner of
usual TRUNCATE command.

Best regards,

2020=E5=B9=B41=E6=9C=888=E6=97=A5(=E6=B0=B4) 1:08 Kohei KaiGai <kaigai@hete=
rodb.com>:
>
> 2020=E5=B9=B41=E6=9C=887=E6=97=A5(=E7=81=AB) 16:03 Michael Paquier <micha=
[email protected]>:
> >
> > On Mon, Jan 06, 2020 at 04:32:39PM -0500, Stephen Frost wrote:
> > > RESTRICT, yes.  I don't know about ONLY being sensible as we don't
> > > really deal with inheritance and foreign tables very cleanly today, a=
s I
> > > said up-thread, so I'm not sure if we really want to put in the effor=
t
> > > that it'd require to figure out how to make ONLY make sense.
> >
> > True enough.
> >
> > > The question about how to handle IDENTITY is a good one.  I suppose
> > > we could just pass that down and let the FDW sort it out..?
> >
> > Looking at the code, ExecuteTruncateGuts() passes down restart_seqs,
> > so it sounds sensible to me to just pass down that to the FDW
> > callback and the callback decide what to do.
> >
> It looks to me the local sequences owned by a foreign table shall be rest=
arted
> by the core, regardless of relkind of the owner relation. So, even if FDW=
 driver
> is buggy, consistency of the local database is kept, right?
> Indeed, "restart_seqs" flag is needed to propagate the behavior, however,
> it shall be processed on the remote side via the secondary "TRUNCATE" com=
mand.
> Is it so sensitive?
>
> Best regards,
> --
> HeteroDB, Inc / The PG-Strom Project
> KaiGai Kohei <[email protected]>



--=20
HeteroDB, Inc / The PG-Strom Project
KaiGai Kohei <[email protected]>

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