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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Richard Guo <guofenglinux@gmail.com>
Cc: fuboat@outlook.com
Cc: pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #18077: PostgreSQL server subprocess crashed by a SELECT statement with WITH clause
Date: Mon, 04 Sep 2023 22:04:33 -0400
Message-ID: <1237514.1693879473@sss.pgh.pa.us> (raw)
In-Reply-To: <CAMbWs49PRmEWmR0BKG-r8Me0kwr1iLo96diFenhtHYGCvcGgvw@mail.gmail.com>
References: <18077-b9db97c6e0ab45d8@postgresql.org>
	<CAMbWs4-4mDc9j5t+d3MbOSFSTqCDAHQKVV8zE8yiwsaXFGHL9Q@mail.gmail.com>
	<CAMbWs4_zxFFSy8+6-FG2ZdJc91TQGM+yG0Yh7gydhjTQfb=9fg@mail.gmail.com>
	<694541.1693600870@sss.pgh.pa.us>
	<CAMbWs49PRmEWmR0BKG-r8Me0kwr1iLo96diFenhtHYGCvcGgvw@mail.gmail.com>

Richard Guo <guofenglinux@gmail.com> writes:
> BTW, do you think get_name_for_var_field() has similar problem for
> RTE_SUBQUERY case?  The RTE_CTE code path in that function crawls up the
> namespace stack before recursing into the CTE while the RTE_SUBQUERY
> code patch does not, which looks like an oversight.

Hmm, seems suspicious ...

> I tried to find a
> test case to show it's indeed a problem but with no luck.

Note that any test case here would be of the form "dump a view
or rule definition", not "EXPLAIN".  What did you try?

			regards, tom lane





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