views containing aggregates

NAGY Andras (nagya(at)inf(dot)elte(dot)hu) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
views containing aggregates

Long Description
Not sure, whether the `Views containing aggregates sometimes fail' and `Allow views of aggregate columns' entries from the TODO cover this, therefore the bug report. An aggregate select from a view containing aggregates behaves differently as expected. Even if the support for this is on TODO, until fixing this, postgres should print a warning or otherwise reject such use of views.

Sample Code
create table example (
name text
);
insert into example values('alpha');
insert into example values('alpha');
insert into example values('alpha');
insert into example values('alpha');
insert into example values('beta');
insert into example values('beta');
insert into example values('gamma');

-- the following should always return the number
-- of rows a simple `select * from relation' would return

select count(*) from example;
count
-------
7
(1 row)

create view example_view as select name from example group by name;
select * from example_view;
name
-------
alpha
beta
gamma
(3 rows)

-- however, it is not the case here

select count(*) from example_view;
count
-------
4
2
1
(3 rows)

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