On Tue, Sep 27, 2011 at 13:00, Harald Fuchs <hari.fuchs@gmail.com> wrote:
> Pavel Stehule has found a better solution for that:
>
> CREATE OR REPLACE FUNCTION reverse(text) RETURNS text AS $$
> SELECT string_agg(substring($1 FROM i FOR 1), '')
> FROM generate_series(length($1), 1, -1) g(i)
> $$ language sql;
I don't want to get into a pissing contest, but I'm not sure by which
criteria this is "better".
When I needed this function, I compared the speed many different
approaches (6 different versions from the mailing lists). The one I
posted above was the winner, a slightly tuned version of the original
by Shoaib Mir. When testing this right now, it takes half the time of
the function you posted, for short non-Unicode strings at least.
Regards,
Marti
