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BUG #18868: /src/backend/optimizer/path/joinrels.c list_head can be NULL

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From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: dan-eli@mail.ru
Date: 2025-03-26T10:16:53Z
Lists: pgsql-bugs 
The following bug has been logged on the website:

Bug reference:      18868
Logged by:          Daniel Elishakov
Email address:      dan-eli@mail.ru
PostgreSQL version: 17.4
Operating system:   ubuntu 20.04
Description:        

Pointers, returned from function 'list_head' at joinrels.c:1527 and 1528,
may be NULL and is dereferenced at joinrels.c:1550 and 1551.