BITMAP_BIT_POSITION
Purpose
Use BITMAP_BIT_POSITION to construct the one-to-one mapping between a number and a bit position.
                  
The argument expr is of type NUMBER. It is the absolute bit position in the bitmap.
                  
BITMAP_BIT_POSITION returns a NUMBER, the relative bit position. 
                  
If  expr is NULL, the function returns NULL.
                  
If  expr is not an integer, you will see the following error message:
                  
Invalid value has been passed to a BITMAP COUNT DISTINCT related operator.