Convert Cursor to array

Hi,

In a procedure, I put data of Cursor in a two-dimensional array. This allows
me to sort rows.

The problem is this method is too slow.

In fact, I translate a pl/sql procedure to a plpgsql.
Under Oracle, we use bulk and I search to use equivalent of this under
postgresql.

Is that exist ?

Oracle procedure

cursor childCursor is select * from CHILD WHERE......
....
open childCursor;
fetch childCursor bulk collect into children;
close childCursor;

Postgresql procedure :

FOR childRecord IN select * from nico.CHILD WHERE...
LOOP
-- on met les éléments dans le tableau
children[recordcount] := '{'
|| childRecord.child_id ||
','
|| childRecord.evolution ||
','
|| childRecord.isremoved ||
','
|| childRecord.child_class
|| ','
|| childRecord.indx || ','
|| childRecord.ele_id || ','

|| childRecord.doc_id ||
'}';

recordcount := recordcount + 1;

END LOOP;

Bulk are native Oracle array and it is probably faster than array.
Is there native method postgresql to replace bulk ?

Best regards.