Re: Schema variables - new implementation for Postgres 15

Hi

pá 4. 11. 2022 v 15:08 odesílatel Dmitry Dolgov <9erthalion6(at)gmail(dot)com>
napsal:

> > On Fri, Nov 04, 2022 at 05:58:06AM +0100, Pavel Stehule wrote:
> > Hi
> >
> > fix clang warning
>
> I've stumbled upon something that looks weird to me (inspired by the
> example from tests):
>
> =# create variable v2 as int;
> =# let v2 = 3;
> =# create view vv2 as select coalesce(v2, 0) + 1000 as result
>
> =# select * from vv2;
> result
> --------
> 1003
>
> =# set force_parallel_mode to on;
> =# select * from vv2;
> result
> --------
> 1000
>
> In the second select the actual work is done from a worker backend.
> Since values of session variables are stored in the backend local
> memory, it's not being shared with the worker and the value is not found
> in the hash map. Does this suppose to be like that?
>

It looks like a bug, but parallel queries should be supported.

The value of the variable is passed as parameter to the worker backend. But
probably somewhere the original reference was not replaced by parameter