Order by lower(column-alias) doesn't work...

Hi.

 

This works:

select p.firstname, p.lastname, p.firstname || p.lastname as fullname from onp_crm_person p order by fullname;
 

But this doesn't:

select p.firstname, p.lastname, p.firstname || p.lastname as fullname from onp_crm_person p order by lower(fullname);
ERROR:  column "fullname" does not exist
LINE 1: ... as fullname from onp_crm_person p order by lower(fullname);
 

This is just an example-query, in my real query I have a more complex query generating an array of a custom-type which is then referenced to as a column-alias, and then ORDER BY on a function tranforming this array doesn't work:

 

SELECT ...

...
) SELECT ROW(t.entity_id, t.name)::BigIntVarChar from t order by level DESC) as folder_parent_array
 

 

column "folder_parent_array" does not exist

 

What bigintvarchar_to_text_value_flatten() does is to take the "varchar"-part out of the BigintVarchar-type and "flatten" the array by that value so that it sorts nicely.

Any way round this?