BUG #15658: Window Function in a left join using AS or alias for the cloumn name

The following bug has been logged on the website:

Bug reference: 15658
Logged by: Justin G
Email address: zzzzz(dot)graf(at)gmail(dot)com
PostgreSQL version: 11.2
Operating system: Debian 9
Description:

Hello postgresql developers

I believe I found an obscure bug with the window function

Postgresql version 11.2
OS Debian 9
PG Admin 4.1

Have 2 basic tables with a Parent child relationship, a One to Many
relationship. The child table also makes reference to a 3rd table which can
have a many to many relationship. This query returns count(*) of the 3rd
table’s keys in the child table grouped by Parent Table ID.

The base SQL statement works:

select calprorules_id cid , count(*) over
(PARTITION BY calprorules_calprorange_id, calprorules_calprohd_id ) as
howmany
from mcal.calprorules

The error occurs when I put the query into a LEFT JOIN:

select counts.count,
caldetail.*, calprorules_desired_value, calprorules_stdpreceision,
calprorules_mutpreceision ,
calprorange_description, calprorange_id, calprorange_from, calprorange_to

from mcal.caldetail
left join mcal.calprorules on calprorules_id = caldetail_calprorules_id
left join (select calprorules_id as cid , count(*) over
(PARTITION BY calprorules_calprorange_id, calprorules_calprohd_id ) as
howmany
from mcal.calprorules) counts
on counts.cid = caldetail_calprorules_id
left join mcal.calprorange on calprorange_id = calprorules_calprorange_id
where caldetail_calhead_id = 179
order by calprorange_description, caldetails_seqence

Postgresql returns
ERROR: column "caldetail.caldetail_id" must appear in the GROUP BY clause or
be used in an aggregate function LINE 2: caldetail.*,
calprorules_desired_value, calprorules_stdprec...
SQL state: 42803 Character: 24

Delete the AS howmany; it works.

I realized after writing this that I should have written the SQL like this,
deleting the LEFT JOIN and moving the window function into the select
statement:

select caldetail.*, calprorules_desired_value, calprorules_stdpreceision,
calprorules_mutpreceision ,
calprorange_description, calprorange_id, calprorange_from, calprorange_to
,
count(*) over (PARTITION BY calprorules_calprorange_id,
calprorules_calprohd_id )
from mcal.caldetail
left join mcal.calprorules on calprorules_id =
caldetail_calprorules_id
left join mcal.calprorange on calprorange_id =
calprorules_calprorange_id
where caldetail_calhead_id = 179
order by calprorange_description, caldetails_seqence

Clearly the second SQL statement is better, but i do not believe the window
function should error when put into a join