Re: BUG #16636: Upper case issue in JSONB type

On Fri, Sep 25, 2020 at 8:13 AM PG Bug reporting form <
noreply(at)postgresql(dot)org> wrote:

> The following bug has been logged on the website:
>
> Bug reference: 16636
> Logged by: ChandraKumar Ovanan
> Email address: osaimar19(at)gmail(dot)com
> PostgreSQL version: 11.0
> Operating system: Windows 10
> Description:
>
> Hi All,
> Below example which I was execute query in postgres.
> The problem statement here, when I use upper case function by converting
> JSONB object has Null value,
> Then I getting below error.
> Please could fix it defect or why this behavior on postures,required
> clarification
>
> Error message:
> SQL Error [22P02]: ERROR: invalid input syntax for type json
> Detail: Token "NULL" is invalid.
> Where: JSON data, line 1: ...E": "2018-01-10", "NAME": "TEST3"}, {"DATE":
> NULL...
>
> CREATE TABLE logs(id serial, data JSONB);
> INSERT INTO logs VALUES
> (1,
>
> '[{"name":"test1","date":"2020-11-11"},{"name":"test2","date":"2018-01-10"}]'),
> (2,
> '[{"name":"test3","date":"2020-05-18"},{"name":"test4","date":"null"}]');
>
> SELECT * FROM logs WHERE data @> '[{"date":null}]';
> SELECT * FROM logs WHERE upper(data::text)::jsonb @>
> upper('[{"date":"2018-01-10"}]')::jsonb ; --Not working
>
>
The error and the example queries don't seem to match...

When you upper('{"date":null}'::text) you get the literal text:
{"date":NULL}, which is not valid json; a JSON null "value" must be written
in lowercase. You would find the same problem had you chosen a boolean
field and written true/false as documented on the json data type page [1],
Table 8.23, and the json standard [2]

David J.

1. https://www.postgresql.org/docs/13/datatype-json.html
2. https://www.json.org/json-en.html