initialisation:
FOR p_tmp IN SELECT DISTINCT ON(ttc_id) ttc_id FROM ttc_ids
LOOP
-- get next value for index
i = array_upper(p_ttc_ids, 1) + 1; IF i IS NULL THEN i := 0; END IF;
--RAISE NOTICE '[%]', i;
p_ttc_ids[i] := p_tmp.ttc_id;
p_bytes_in[i] := 0;
p_bytes_out[i] := 0;
END LOOP;
This isn't well style for plpgsql. It's slow for bigger arrays.
create or replace function filltest1(int) returns void as $$
declare a int[];
begin
for i in 1..$1 loop
a[i] := 0;
end loop;
end; $$ language plpgsql;
-- with trick, its necessary for $1> 8000
create or replace function filltest2(int) returns void as $$
declare a int[];
begin
a := case $1 when 0 then '{}' when 1 then '{0}' else
'{0'||repeat(',0', $1-1) || '}' end;
end; $$ language plpgsql;
filltest2 is more cryptographic , but is 10-20% faster and for
sizeof(a) > ~ 8000 is 30x faster. If you now max size of array you can
do:
declare a int[] = '{0,0,0,0..........}'; b int[] = '{....}'
every array update generates new version of array -> update is more
expensive than you can know from classic languages.
