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BUG #19099: Conditional DELETE from partitioned table with non-updatable partition raises internal error

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From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: exclusion@gmail.com
Date: 2025-10-29T20:00:02Z
Lists: pgsql-bugs

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  1. Fix bogus ctid requirement for dummy-root partitioned targets

The following bug has been logged on the website:

Bug reference:      19099
Logged by:          Alexander Lakhin
Email address:      exclusion@gmail.com
PostgreSQL version: 18.0
Operating system:   Ubuntu 24.04
Description:        

The following script:
CREATE EXTENSION file_fdw;
CREATE SERVER file_server FOREIGN DATA WRAPPER file_fdw;
CREATE TABLE pt (a int, b text) partition by list (a);
CREATE FOREIGN TABLE p1 partition of pt for values in (1) SERVER file_server
OPTIONS (format 'csv', filename '/tmp/1.csv');
SET enable_partition_pruning = 'off';
EXPLAIN DELETE FROM pt WHERE false;

raises:
ERROR:  XX000: could not find junk ctid column
LOCATION:  ExecInitModifyTable, nodeModifyTable.c:4867
(Discovered with SQLsmith.)

Reproduced starting from 86dc9005.

On 86dc9005~1 or with enable_partition_pruning = 'on', EXPLAIN outputs the
query plan and "DELETE FROM pt WHERE false;" completes with no error.