generic way to retrieve array as rowset

When storing data in an array, like this

id    array
1,     {1,2}
2,     {10,20}
3,     {100,200}

is there a generic way to retrieve them as arowset, like this

id    array_dimension1
1    1
1     2
2     10
2     20

By writing something like this:

Select id, explode(array) From foo Where id<3

(I know - store it as a table instead of an array, but beside that.)

Thanks.
Balázs