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BUG #19342: ERROR: function gcd(smallint, smallint) is not unique

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From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: dqetool@126.com
Date: 2025-12-02T13:02:53Z
Lists: pgsql-bugs 
The following bug has been logged on the website:

Bug reference:      19342
Logged by:          Jason Smith
Email address:      dqetool@126.com
PostgreSQL version: 18.0
Operating system:   Ubuntu 22.04
Description:        

Run the following statements, where the error may be not expected.
```sql
CREATE TABLE t1 (c1 SMALLINT);
SELECT (gcd(c1, c1)) FROM t1; -- ERROR: function gcd(smallint, smallint) is
not unique
```