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From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: theshallow27@gmail.com
Subject: BUG #19737: Empty `JSON_OBJECT` cannot use documented `ON NULL` or unique-key clauses
Date: Fri, 02 Oct 2026 22:36:20 +0000
Message-ID: <19737-b44cf2e08708b613@postgresql.org> (raw)

The following bug has been logged on the website:

Bug reference:      19737
Logged by:          Shallow
Email address:      theshallow27@gmail.com
PostgreSQL version: 18.6
Operating system:   Linux
Description:        

The documented syntax makes the key/value pair list optional and says that
an
empty pair list constructs an empty object. However, adding any of the
optional
clauses without a pair causes a syntax error.

**Reproduction:**

```sql
SELECT JSON_OBJECT();                 -- returns {}
SELECT JSON_OBJECT(NULL ON NULL);     -- syntax error, SQLSTATE 42601
SELECT JSON_OBJECT(ABSENT ON NULL);   -- syntax error, SQLSTATE 42601
SELECT JSON_OBJECT(WITH UNIQUE KEYS); -- syntax error, SQLSTATE 42601
```

**Expected result:** Each form with an empty pair list should construct
`{}`;
the clauses do not change the result when there are no pairs.

Message-ID: <19737-b44cf2e08708b613@postgresql.org>
Permalink:  ../19737-b44cf2e08708b613@postgresql.org/
Also on:    postgresql.org/message-id/19737-b44cf2e08708b613@postgresql.org

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