Re: Manipulating complex types as non-contiguous structures in-memory - Mailing list pgsql-hackers

Andres Freund <andres@anarazel.de> writes:
> I'm not sure what exactly to use as a performance benchmark
> here. For now I chose
> SELECT * FROM (SELECT ARRAY(SELECT generate_series(1, 10000))) d, generate_series(1, 1000) repeat(i);
> that'll hit array_out, which uses iterators.

Hmm, probably those results are swamped by I/O functions though.
I'd suggest trying something that exercises array_map(), which
it looks like means doing an array coercion.  Perhaps like so:

do $$
declare a int4[];
x int;
begin a := array(select generate_series(1,1000)); for i in 1..100000 loop   x := array_length(a::int8[], 1); end loop;
end$$;

Anyway, thanks for poking at it!
        regards, tom lane