Submitted by: @ibprovider

Is related to QA564

Hi

------------
create procedure sp_test(IN_ARG INTEGER)
returns (OUT_ARG INTEGER)
as
begin
OUT_ARG=IN_ARG;
end;

select pp.rdb$parameter_name,pp.rdb$parameter_mechanism
from rdb$procedure_parameters pp
where pp.rdb$procedure_name='SP_TEST';

------------
Firebird 2.5.1 returns NULL in rdb$parameter_mechanism column

Firebird 3 [build 29220] returns 1 [fb_prm_mech_type_of] in rdb$parameter_mechanism column

I think, FB3 should write to rdb$parameter_mechanism the NULL or 0 [fb_prm_mech_normal]

Commits: 51f68bd

====== Test Details ======

NB: engine treats nulls and zeroes as the same value, so it is enough to check that parameter mechanism is either null or zero only.