Обсуждение: plpgsql : looping over multidimensional array : getting NULL for subdimension

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?

Thanks and Regards,
Samba

Use array_upper(aList, 2);
see the example, maybe can help u


CREATE OR REPLACE FUNCTION
xxx(
     aList varchar[][])
returns TEXT as '
declare
     myUpper1 integer;
     myUpper2 integer;

     myRet varchar := '''';
begin
     myUpper1 := array_upper(aList, 1);
     IF myUpper1 IS NULL THEN
         myUpper1 := 0;
     END IF;
     myUpper2 := array_upper(aList, 2);
     IF myUpper2 IS NULL THEN
         myUpper2 := 0;
     END IF;

     FOR i in 1 .. myUpper1 LOOP
         FOR k in 1 .. myUpper2 LOOP
             myRet := myRet || aList[i][k];
         END LOOP;
         myRet := myRet || ''_'';
     END LOOP;

     RETURN myRet;
end;
'
LANGUAGE 'plpgsql';