Varrays without limit?

I faced a t-sql code that the programmer used a one column temporary table for saving result from another select.
It think this can be done using varray in pl/sql(In fact there is no array in t-sql,if was then programmer used it).
But the problem is I do not know what is the max number of rows can be retrieved from select so I can 't define limit of varray.
Is there any solution?Should I use pl/sql tables or just global temporary tables?
Thanks