I read release notes, but can't find any related change,
It works for PostgreSQL 14.5 but fails with PostgreSQL 15.0, a test sample below.
Is this error expected ?
Thanks,
create table tbla
( a "char"
);
create table tblb
( b char(1)
);
insert into tbla values ('a');
insert into tbla values ('b');
insert into tblb values ('c');
insert into tblb values ('d');
-- works with 14.5 fails on 15.0
select a from tbla
union all
select
case when true then 'p'
else 'u'
end from tblb;