Re: pg_dump, ATTACH, and independently restorable child partitions

From: Justin Pryzby <pryzby(at)telsasoft(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, David Rowley <drowley(at)postgresql(dot)org>, pgsql-hackers(at)lists(dot)postgresql(dot)org
Subject: Re: pg_dump, ATTACH, and independently restorable child partitions
Date: 2020-12-02 22:50:13
Message-ID: 20201202225013.GJ24052@telsasoft.com
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On Wed, Nov 25, 2020 at 06:35:19PM -0500, Tom Lane wrote:
> Justin Pryzby <pryzby(at)telsasoft(dot)com> writes:
> > 1. Maybe pg_restore ExecuteSqlCommandBuf() should (always?) call
> > ExecuteSimpleCommands() instead of ExecuteSqlCommand(). It doesn't seem to
> > break anything (although that surprised me).
>
> That certainly does break everything, which I imagine is the reason
> why the cfbot shows that this patch is failing the pg_upgrade tests.

Thanks for looking, I have tried this.

> What we'd need to do if we want this to work with direct-to-DB restore
> is to split off the ATTACH PARTITION command as a separate TOC entry.
> That doesn't seem amazingly difficult, and it would even offer the
> possibility that you could extract the partition standalone without
> having to ignore errors. (You'd use -l/-L to select the CREATE TABLE,
> the data, etc, but not the ATTACH object.)

--
Justin

Attachment Content-Type Size
v4-0001-pg_dump-output-separate-object-for-ALTER-TABLE.AT.patch text/x-diff 9.6 KB

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