Re: BUG #16619: Amcheck detects corruption in hstore' btree index (ver 2)

Hi, Peter!

On Wed, Sep 16, 2020 at 8:47 PM Peter Geoghegan <pg@bowt.ie> wrote:
> On Wed, Sep 16, 2020 at 7:24 AM Anastasia Lubennikova
> <a.lubennikova@postgrespro.ru> wrote:
> > For v2 indexes pivot tuple's offset can contain any random number which
> > will lead to bt_pivot_tuple_identical() failure.
> >
> > The fix is pretty simple - only compare data part of the tuples. I think
> > we can skip offnum check for all index versions to keep the code simple.
>
> I pushed a tweaked version of this patch. It seemed worth preserving
> the inclusion of offset number in the bt_pivot_tuple_identical()
> memcmp() comparison. The field contains important metadata that really
> should match. Also, I made sure to compare t_info field on all indexes
> (including pg_upgrade'd indexes) for the same reason.
>
> We already account for heapkeyspace difference in other similar
> routines, such as invariant_l_offset().  It's not hard to do this here
> as well.

I was going to tweak this patch in a similar way, but made it in
advance.  Your commit looks good to me, thanks!

------
Regards,
Alexander Korotkov