On Fri, Sep 21, 2018 at 10:09 AM Pavel Stehule <pavel.steh...@gmail.com> wrote:
> Hi > > can we implement prefix function for fast test if substr is prefix of some > string? > > create or replace function prefix(str text, substr text) > returns boolean as $$ > select substr(str, 1, length(substr)) = substr > $$ language sql; > > This function can be very effective in C language. Now it should be > implemented with like or regexp, what is significantly more expensive. > > These would just be wrappers around already existing internal functions, right? > Regards > > Pavel > -- Best Regards, Chris Travers Head of Database Tel: +49 162 9037 210 | Skype: einhverfr | www.adjust.com Saarbrücker Straße 37a, 10405 Berlin
