BUG #18809: Inconsistent JSON behavoir
The following bug has been logged on the website:
Bug reference: 18809
Logged by: Mark Drake
Email address: mark.drake@golden-hind.com
PostgreSQL version: 17.0
Operating system: Linux
Description:
broadway=# select jsonb('[2,3,1]') @> to_jsonb(1);
?column?
----------
t
(1 row)
broadway=# select jsonb('[2,3,1]') @> to_jsonb(4);
?column?
----------
f
(1 row)
broadway=# select jsonb('[2,3,1]') @> to_jsonb(4);
?column?
----------
f
(1 row)
broadway=# select jsonb('[2,3,1]') - 1;
?column?
----------
[2, 1]
(1 row)
broadway=#
broadway=# select jsonb('[2,3,1]') - to_jsonb(1);
ERROR: operator does not exist: jsonb - jsonb
LINE 1: select jsonb('[2,3,1]') - to_jsonb(1);
^
HINT: No operator matches the given name and argument types. You might need
to add explicit type casts.
broadway=#
Given that the first statement show the array contains an element that
matches to_jsonb(1) the fourth statement should delete the third ( index 2)
item from the array, not return an argument type mismatch. This would solve
the problem of not being able to delete from a JSON integer array by value
On Wednesday, February 12, 2025, PG Bug reporting form <
noreply@postgresql.org> wrote:
The following bug has been logged on the website:
Bug reference: 18809
Logged by: Mark Drake
Email address: mark.drake@golden-hind.com
PostgreSQL version: 17.0
Operating system: Linux
Description:broadway=#
broadway=# select jsonb('[2,3,1]') - to_jsonb(1);
ERROR: operator does not exist: jsonb - jsonb
LINE 1: select jsonb('[2,3,1]') - to_jsonb(1);
^
HINT: No operator matches the given name and argument types. You might
need
to add explicit type casts.
broadway=#Given that the first statement show the array contains an element that
matches to_jsonb(1) the fourth statement should delete the third ( index 2)
item from the array, not return an argument type mismatch. This would solve
the problem of not being able to delete from a JSON integer array by value
This would be a feature request, not a bug report.
Feature requests usually are better sent to the -general mailing list where
support and possible developers are more likely to be looking.
I do concur we seem to have a feature gap here.
David J.
"David G. Johnston" <david.g.johnston@gmail.com> writes:
On Wednesday, February 12, 2025, PG Bug reporting form <
noreply@postgresql.org> wrote:broadway=# select jsonb('[2,3,1]') - to_jsonb(1);
ERROR: operator does not exist: jsonb - jsonb
LINE 1: select jsonb('[2,3,1]') - to_jsonb(1);
This would be a feature request, not a bug report.
Indeed. We have these cases today:
postgres=# \do -
List of operators
Schema | Name | Left arg type | Right arg type | Result type | Description
------------+------+-----------------------------+-----------------------------+-----------------------------+-------------------------------------
...
pg_catalog | - | jsonb | integer | jsonb | delete array element
pg_catalog | - | jsonb | text | jsonb | delete object field
pg_catalog | - | jsonb | text[] | jsonb | delete object fields
...
These are already less than consistent, for example this is allowed:
postgres=# select jsonb('[2,3,1]') - 'foo'::text;
?column?
-----------
[2, 3, 1]
(1 row)
but this not so much:
postgres=# select jsonb('{"a": 1, "b": 2}') - 1;
ERROR: cannot delete from object using integer index
To invent jsonb - jsonb, you'd need to define its behavior for
every possible JSON structure on each side. I foresee plenty of
bikeshedding.
regards, tom lane