Re: [HACKERS] [PATCH] Generic type subscripting

> On Wed, Jan 06, 2021 at 09:22:53PM +0100, Pavel Stehule wrote:
>
> this case should to raise exception - the value should be changed or error
> should be raised
>
> postgres=# insert into foo values('{}');
> postgres=# update foo set a['a'] = '100';
> postgres=# update foo set a['a'][1] = '-1';
> postgres=# select * from foo;
> ┌────────────┐
> │ a │
> ╞════════════╡
> │ {"a": 100} │
> └────────────┘

I was expecting this question, as I've left this like that intentionally
because of two reasons:

* Opposite to other changes, to implement this one we need to introduce
a condition more interfering with normal processing, which raises
performance issues for already existing functionality in jsonb_set.

* I vaguely recall there was a similar discussion about jsonb_set with
the similar solution.

For the references what I mean I've attached the third patch, which does
this. My opinion would be to not consider it, but I'm fine leaving this
decision to committer.