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Re: Don't pass NULL pointer to strcmp().

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Nathan Bossart <nathandbossart@gmail.com>
Cc: Xing Guo <higuoxing@gmail.com>, Aleksander Alekseev <aleksander@timescale.com>, pgsql-hackers <pgsql-hackers@postgresql.org>, Junwang Zhao <zhjwpku@gmail.com>
Date: 2023-11-02T02:39:04Z
Lists: pgsql-hackers 
Nathan Bossart <nathandbossart@gmail.com> writes:
> On Wed, Nov 01, 2023 at 09:57:18PM -0400, Tom Lane wrote:
>> After digging around for a bit, I think part of the problem is a lack
>> of a clearly defined spec for what should happen with NULL string GUCs.

> What if we disallowed NULL string GUCs in v17?

Well, we'd need to devise some other solution for hacks like the
one used by timezone_abbreviations (see comment in
check_timezone_abbreviations).  I think it's not worth the trouble,
especially seeing that 95% of guc.c is already set up for this.
The bugs are mostly in newer code like get_explain_guc_options,
and I think that's directly traceable to the lack of any comments
or docs about this behavior.

			regards, tom lane

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Make GetConfigOption/GetConfigOptionResetString return "" for NULL.

  2. Be more wary about NULL values for GUC string variables.

  3. doc: Replace reference to ERRCODE_RAISE_EXCEPTION by "raise_exception"