Kingbase数组排序

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create or replace function RTU_ARRAY_SORT(anyarray text[],f_order text) returns text[]
as declare 
	tmp text;
	result text[];
begin
	if lower(f_order) = 'desc' then
		for tmp in select unnest(anyarray) as a order by a desc
		loop
			result := array_append(result,tmp::text);
		end loop;
		return result;
	elsif lower(f_order) = 'asc' then
		for tmp in select unnest(anyarray) as a order by a asc
		loop
			result := array_append(result,tmp::text);
		end loop;
		return result;
	else 
		return array['f_order must be asc or desc!'];
	end if;
end;

select RTU_ARRAY_SORT('{1,3,2}','asc');
select RTU_ARRAY_SORT('{1,3,2}','desc');
select RTU_ARRAY_SORT('{a,c,b}','asc');
select RTU_ARRAY_SORT('{a,c,b}','desc');

返回分别是：
{1,2,3}
{3,2,1}
{a,b,c}
{c,b,a}