#26908: jsonfield__key__isnull lookup crashes
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Reporter: sigfrido | Owner:
Type: Bug | Status: new
Component: contrib.postgres | Version: 1.9
Severity: Normal | Resolution:
Keywords: jsonb,postgresql | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 1 | UI/UX: 0
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Comment (by sigfrido):
You're right, I didn't notice:
{{{
(('{"key": null}' :: jsonb) -> 'key') = 'null'::jsonb
-- which is different from SQL null, thus:
(('{"key": null}' :: jsonb) -> 'key') is null = false
-- but:
(('{"key": null}' :: jsonb) ->> 'key') is null = true
}}}
so after the fix, I believe the '''isnull''' lookup would behave exactly
as '''has_key'''.
I won't expect that. There would be no way to find instances having a
{'key':null}.
On the other hand, on PG docs they say that jsonb 'null' and SQL NULL have
different meaning. Should we introduce a new lookup '''is_null_json'''
maybe?
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Ticket URL: <https://code.djangoproject.com/ticket/26908#comment:2>
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