A better approach 

         path         | level |                  text
----------------------+-------+----------------------------------------
 {-19,4}              |     0 | Top comment
 {-19,4,-22,8}        |     1 | Top reply to top comment
 {-19,4,-22,8,-12,11} |     2 | Top response to top reply
 {-19,4,-22,8,-1,9}   |     2 | Meh response to top reply
 {-19,4,-6,5}         |     1 | Earliest reply to top comment
 {-3,7}               |     0 | Less highly rated comment
 {-3,7,-5,10}         |     1 | Reply to less highly rated comment
 {0,3}                |     0 | Crap comment that nobody wants to read