On Tue, Oct 3, 2017 at 9:07 AM, Alexander Korotkov
<a.korot...@postgrespro.ru> wrote:
> +1,
> I see 3 options there:
> 1) Drop high-order bit, as you proposed.
> 2) Allow negative queryIds.
> 3) Implement unsigned 64-type.
> #1 causes minor loss of precision which looks rather insignificant in given
> context.
> #2 might be rather unexpected for users whose previously had non-negative
> queryIds.  Changing queryId from 32-bit to 64-bit itself might require some
> adoption from monitoring software. But queryIds are user-visible, and
> negative queryIds would look rather nonlogical.

Per the principal of least astonishment perhaps:
Negative values tend to be considered as error codes as well.

> #3 would be attaching hard and long-term problem by insufficient reason.
> Thus, #1 looks like most harmless solution.

In this case going for #1 looks like the safest bet.

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