Марк schrieb am 12.09.2019 um 12:55:
> With `jsonb_set()`, when `new_value` is `NULL`, the function would **erase the whole object**:
>
> postgres=# SELECT jsonb_set('{"something":1}'::jsonb, '{language}', null, true);
> jsonb_set
> -----------
>
> (1 row)
>
> This is really dangerous for it may lead to data loss. Imaging the `new_value` argument being a function which
returns`NULL` values in some cases.
> The expected behavior is, perhaps, to convert an SQL `NULL` value to JSONB null value: 'null'::jsonb
> This way no data would be lost.
>
> Or at the very least, this behavior should be documented.
I have asked the same: https://www.postgresql.org/message-id/flat/qfkua9%242q0e%241%40blaine.gmane.org
In short: not a bug ;)