| From: | David Rowley <dgrowleyml(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Andrew Dunstan <andrew(at)dunslane(dot)net>, Richard Guo <guofenglinux(at)gmail(dot)com>, jian he <jian(dot)universality(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Revert: Remove useless self-joins *and* -DREALLOCATE_BITMAPSETS make server crash, regress test fail. |
| Date: | 2024-05-07 22:35:42 |
| Message-ID: | CAApHDvoR9cXHb_+j7j8=zBty35B8z22SX51cZN7ZRf+QTPJ1fA@mail.gmail.com |
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On Wed, 8 May 2024 at 06:20, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> I find that Richard's proposed fix makes the core regression tests
> pass, but we still fail check-world. So I'm afraid we need something
> more aggressive, like the attached which makes make_restrictinfo
> copy all its input bitmapsets. Without that, we still have sharing
> of bitmapsets across different RestrictInfos, which seems pretty
> scary given what we now see about the effects of 00b41463c. This
> seems annoyingly expensive, but maybe there's little choice?
We could make the policy copy-on-modify. If you put bms_copy around
the bms_del_member() calls in remove_rel_from_query(), does it pass
then?
David
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