On Thu, Jun 10, 2010 at 6:59 PM, J. Greg Davidson <greg@ngender.net> wrote:
> Hi fellow PostgreSQL hackers!
>
> I tried to write an SQL glue function to turn an array
> of alternating key/value pairs into an array of arrays
> and got the message
>
> ERROR: 42704: could not find array type for data type text[]
I do it like this:
create type pair_t as (key text, value text);
> -- BEGIN CODE
>
> -- Here's a simplified example:
>
> CREATE OR REPLACE
> FUNCTION text__(variadic text[]) RETURNS text[][] AS $$
> SELECT ARRAY(
> SELECT ARRAY[ $1[i], $1[i+1] ]
> FROM generate_series(1, array_upper($1,1), 2) i
> )
> $$ LANGUAGE sql;
create or replace function pairs(variadic text[]) returns pair_t[] as
$$
select array(select ($1[i], $1[i+1])::pair_t
FROM generate_series(1, array_upper($1,1), 2) i)
$$ language sql immutable;
merlin