| From: | "Anton A(dot) Melnikov" <a(dot)melnikov(at)postgrespro(dot)ru> |
|---|---|
| To: | jian he <jian(dot)universality(at)gmail(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com> |
| Cc: | Nikita Malakhov <hukutoc(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Erik Rijkers <er(at)xs4all(dot)nl>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: remaining sql/json patches |
| Date: | 2023-10-16 13:44:27 |
| Message-ID: | c04ff761-930b-4345-ae23-f78b8ee7ce32@postgrespro.ru |
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| Lists: | pgsql-hackers |
Hello!
On 16.10.2023 15:49, jian he wrote:
> add the following code after ExecEvalJsonExprCoercion if
> (!InputFunctionCallSafe(...) works, but seems like a hack.
>
> if (!val_string)
> {
> *op->resnull = true;
> *op->resvalue = (Datum) 0;
> }
It seems the constraint should work here:
After
CREATE TABLE test (
js text,
i int,
x jsonb DEFAULT JSON_QUERY(jsonb '[1,2]', '$[*]' WITH WRAPPER)
CONSTRAINT test_constraint
CHECK (JSON_QUERY(js::jsonb, '$.a' RETURNING char(5) OMIT QUOTES EMPTY ARRAY ON EMPTY) > 'a')
);
INSERT INTO test_jsonb_constraints VALUES ('[]');
one expected to see an error like that:
ERROR: new row for relation "test" violates check constraint "test_constraint"
DETAIL: Failing row contains ([], null, [1, 2]).
not "INSERT 0 1"
With best regards,
--
Anton A. Melnikov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company
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