Re: [HACKERS] Optional message to user when terminating/cancelling backend

On Fri, Jul 06, 2018 at 12:18:02PM +1200, Thomas Munro wrote:
> 6118  --select pg_cancel_backend(pg_backend_pid(), 'it brings on many changes');
> 6119  select pg_cancel_backend(pg_backend_pid(), NULL);
> 6120! ERROR:  canceling statement due to user request
> 6121--- 25,32 ----
> 6122
> 6123  --select pg_cancel_backend(pg_backend_pid(), 'it brings on many changes');
> 6124  select pg_cancel_backend(pg_backend_pid(), NULL);
> 6125!  pg_cancel_backend
> 6126! -------------------
> 6127!  t
> 
> Apparently Windows can take or leave it as it pleases.
> 
> https://ci.appveyor.com/project/postgresql-cfbot/postgresql/build/1.0.4488

The test coverage looks adapted if it is possible to catch such
failures, so that's nice.

+select pg_cancel_backend();
+ERROR:  function pg_cancel_backend() does not exist
+LINE 1: select pg_cancel_backend();
This negative test is not really necessary.
--
Michael