Re: [REPOST] plpgsql : looping over multidimensional array : getting NULL for subdimension

[Samba <saasira@xxxxxxxxx>]

Thank you  Merlin for your answer,

       I tried that and is working as you said.
       But when I do 
                   other_array=some_array[1:2];
       I'm getting the entire  '{{samba,sarath,sreenivas},{samba,mukhesh,pavan}}';

       not just the second subarray, i.e. '{{samba,mukhesh,pavan}}'.

       Is there any way I can get only the corresponding slice of the array?

       otherwise I need to call this function multiple times from my java client, once per each sub-array which I think will more expensive 

       that doing it in just one stored procedure call.

Regards,
Samba

On Thu, Dec 2, 2010 at 2:04 AM, Merlin Moncure <mmoncure@xxxxxxxxx> wrote:

On Wed, Dec 1, 2010 at 10:51 AM, Samba <saasira@xxxxxxxxx> wrote:
> Hi all,
>
> I'm trying to loop over a multidimensional array and find if any of the
> elements in a sub-dimensional array are matching some known criteria but
> facing issue with NULL for the sub arrays.
>
> I have a data structure that looks like:
>
>    some_array VARCHAR[][] :=
> '{{samba,sarath,sreenivas},{samba,mukhesh,pavan}}';
>
> I'm trying to assign the individual sub arrays to other array elements like:
>
>   other-array VARCHAR[];
>
>   other_array=some_array[1];
>
> and I'm expecting to get '{samba,sarath,sreenivas}' for index 1 and
> {samba,mukhesh,pavan} for index 2;
> however, I'm getting NULL.
>
> Can some one explain the way I can assign subarrays to other array elements
> plpgsql?

There is no truly effective way to do that.  you can however slice the
array which is almost as good:
other_array=some_array[1:1];
note this will give {{samba,sarath,sreenivas}}, not {samba,sarath,sreenivas}

merlin