BUG #18840: Segmentation fault in executing select unnest(array(oidvector))

The following bug has been logged on the website:

Bug reference:      18840
Logged by:          yang lei
Email address:      ylshiyu@126.com
PostgreSQL version: 16.8
Operating system:   Ubuntu 22.04
Description:        

Hi,
I encountered a segmentation fault when using 'select
unnest(array(oidvector))'.

bug demo:
CREATE TABLE my_table (
    id SERIAL PRIMARY KEY,
    oidvector_col oidvector
);
INSERT INTO my_table (oidvector_col) VALUES ('12345 67890 54321');
SELECT unnest(ARRAY(SELECT oidvector_col)) from my_table;

server closed the connection unexpectedly                                   
                                                                       This
probably means the server terminated abnormally
        before or while processing the request.
The connection to the server was lost. Attempting reset: 2025-03-12
20:18:04.642 CST [1478] LOG:  server process (PID 1578) was terminated by
signal 11: Segmentation fault