Re: unnest on multi-dimensional arrays

Hello

postgres=# CREATE OR REPLACE FUNCTION public.reduce_dim(anyarray)
RETURNS SETOF anyarray
LANGUAGE plpgsql
AS $function$
DECLARE s $1%type;
BEGIN
FOREACH s SLICE 1 IN ARRAY $1 LOOP
RETURN NEXT s;
END LOOP;
RETURN;
END;
$function$;
CREATE FUNCTION

postgres=# select reduce_dim(array[array[1, 2], array[2, 3]]);
reduce_dim
------------
{1,2}
{2,3}
(2 rows)

Regards

Pavel Stehule

2013/11/28 Zev Benjamin <zev-pgsql(at)strangersgate(dot)com>

> It appears that unnest, when called on a multi-dimensional array,
> effectively flattens the array first. For example:
>
> => select * from unnest(array[array[1, 2], array[2, 3]]);
> unnest
> --------
> 1
> 2
> 2
> 3
> (4 rows)
>
> while I would have expect something like the following:
>
> => select * from unnest(array[array[1, 2], array[2, 3]]);
> unnest
> --------
> {1, 2}
> {2, 3}
> (2 rows)
>
> Is there any way to get the latter behavior?
>
>
> Zev
>
>
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