Certainly not --- per the SQL spec, different elements of a FROM list
are independent, so the datelist relation can't refer to P.
(I think SQL 2003 has a construct called LATERAL that would allow
such things, but we don't implement that yet.)
The only way to do this at the moment in Postgres is to put the
set-returning function into the SELECT target list:
select id, datelist(date_start, date_end) from payment;
which will work fine if datelist() is implemented as a SQL function,
and not so fine if it's implemented in plpgsql. You can work around
this by wrapping the plpgsql function in a SQL function (ick).
I posted an example in another thread a day or so ago.
regards, tom lane
This wraping works! Thanks Tom.
create function datelist_sql(date, date) returns setof date as'
select
* from datelist($1,$2) '
language 'sql' strict immutable;
Then simply do this query
"select datelist('8/1/2005', '8/6/2005')"
otherwise with plpgsql function I got
ERROR: set-valued function called in context that cannot accept a set
