On 01/04/2026 09:32, Ning Sun wrote:
> I'm maintaining a Rust library pgwire to implement postgres wire
> protocol in rust. While doing a corner case test, I noticed the
> inconsistency for ParameterDescription between backend and frontend.
>
> The backend allows up to 65535 parameters in a prepared statement. But
> when running Describe on the statement, there is a size limit of 30000
> bytes for ParameterDescription on the frontend. This means we can only
> describe statements with at most ~7500 parameters. For statements exceed
> the limit, it ends up with error about the message size.
>
> This patch simply adds ParameterDescription to VALID_LONG_MESSAGE_TYPE
> whitelist to remove the cap.
Committed and backpatched to all supported versions, thanks!
- Heikki
