Re: element from an array by its index

On Tue, Jul 21, 2009 at 02:29:12PM -0400, Merlin Moncure wrote:
> On Tue, Jul 21, 2009 at 10:47 AM, Sam Mason<sam(at)samason(dot)me(dot)uk> wrote:
> > On Tue, Jul 21, 2009 at 04:08:51PM +0600, Murat Kabilov wrote:
> >> I would like to know if there is a function that extracts an element by its
> >> index from an array?
> >
> > No, the syntax most people expect and use would be arr[ndx]. If you
> > want a function, it would be easy to do:
> >
> > CREATE FUNCTION array_index(anyarray,int)
> > RETURNS anyelement IMMUTABLE
> > LANGUAGE sql AS $$
> > SELECT $1[$2]; $$;
>
> but, why would you write a function to do this?

No idea, my guess was that Murat is driving PG through some other code
and this expected to generate function-call style syntax for everything,
including array indexing.

I'd be interested to know the real reason as well!

--
Sam http://samason.me.uk/