No: the function is calc_total(int,int,int) and the table have the
same types.
As Tom said that my problem is because of planning in pl/pgsql. As
is written in
http://www.postgresql.org/docs/7.3/static/plpgsql.html#PLPGSQL-OVERVIEW
plans for queries in pl/pgsql are made just once - when they are
first used in function by backend. So AFAICS this planning do not
take into consideration table statistics because it don't see values
of variables in queries (or if see than it must not take them into account,
because they may be changed in future function callings).
I rollback to my previous realization of calc_total() on pl/tcl. I
use there spi_exec - so the query always regards as dynamic - it
always parsed, rewritten, planned but executes fastest much more
:)
On Fri, 3 Oct 2003, Gaetano Mendola wrote:
> Andriy Tkachuk wrote:
>
> > Hi folks.
> >
> > What's wrong with planner that executes my query in function?:
> > (i mean no explanation but runtime)
> >
> >
> > tele=# EXPLAIN analyze select calc_total(6916799, 1062363600, 1064955599);
> > QUERY PLAN
> > ------------------------------------------------------------------------------------------
> > Result (cost=0.00..0.01 rows=1 width=0) (actual time=36919.37..36919.37 rows=1 loops=1)
> > Total runtime: 36919.40 msec
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >
> > tele=# \df+ calc_total
> > ...
> > declare
> > usr alias for $1;
> > d1 alias for $2;
> > d2 alias for $3;
> > res integer;
> > begin
> > select sum(cost) into res
> > from bills where
> > (parent(user_id) = usr or user_id = usr)
> > and dat >= d1 and dat < d2;
> > if res is not null then
> > return res;
> > else
> > return 0;
> > end if;
> > end;
>
> You didn't wrote the type of d1 and d2, I had your same problem:
>
> declare
> a_user alias for $1;
> res INTEGER;
> begin
> select cost into res
> from my_table
> where login = a_user;
>
> ......
> end;
>
> the problem was that login was a VARCHAR and a_user was a TEXT so
> the index was not used, was enough cast a_user::varchar;
>
>
> I believe that your dat, d1, d2 are not "index" comparable.
>
>
> Gaetano
>
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