| From: | Michael Paquier <michael(at)paquier(dot)xyz> |
|---|---|
| To: | Lepikhov Andrei <a(dot)lepikhov(at)postgrespro(dot)ru> |
| Cc: | Richard Guo <guofenglinux(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, fuboat(at)outlook(dot)com, pgsql-bugs(at)lists(dot)postgresql(dot)org |
| Subject: | Re: BUG #18077: PostgreSQL server subprocess crashed by a SELECT statement with WITH clause |
| Date: | 2023-09-07 09:46:43 |
| Message-ID: | ZPmcAwVO4qO4z5T5@paquier.xyz |
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| Lists: | pgsql-bugs |
On Thu, Sep 07, 2023 at 03:25:36PM +0700, Lepikhov Andrei wrote:
> I invented a dummy extension "pg_extension" [1], commit 4199a0c,
> which adds CustomScan over the first non-parameterized HashJoin at
> the pathlist.
> The example presented in my letter earlier causes the ERROR on
> CTE. Moreover, if you remove the word 'materialized', you will find
> the same error on Subquery.
>
> [1] https://github.com/danolivo/pg_extension/tree/main
Digressing a bit here about this point.. In the long-term I think
that it would be a good idea to have a template module in
src/test/modules/ that shows how to use a CustomScan so as it is able
to demonstrate how this stuff works, and to check if it is works as
intended. With regression tests, of course.
--
Michael
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