There are (at least) 3 ways to call a function from within another
function in plpgsql.
1) v_foo := my_func();
2) select my_func() into v_foo;
3) perform my_func();
The only difference between a select and a perform is that perform
doesn't capture the return value. Also, it should be noted that
perform is a plgpsql-only thing - it won't work outside of a
stored-procedure block.
Just calling 'my_func()' will work in oracle, but in pg you need to
stick a 'perform' in front of it
