Pavel Stehule <pavel.steh...@gmail.com> writes:

> Hi
>
> I try to search notice about it, to get info about release date of this
> feature, but I cannot find it.

It's documented in
https://www.postgresql.org/docs/current/functions-comparisons.html, and
has been around since at least 7.4.

> Regards
>
> Pavel

- ilmari
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