On Tue, 1 Aug 2023 at 06:39, Andy Fan <zhihui.fan1213@gmail.com> wrote:
>
> Hi:
>
> Currently if we want to extract a numeric field in jsonb, we need to use
> the following expression: cast (a->>'a' as numeric). It will turn a numeric
> to text first and then turn the text to numeric again.
Why wouldn't you use cast(a->'a' as numeric), or ((a->'a')::numeric)?
We have a cast from jsonb to numeric (jsonb_numeric in jsonb.c) that
does not require this additional (de)serialization through text.
Kind regards,
Matthias van de Meent
Neon (https://neon.tech)