It was moved because it’s a How To question, not a tech support question. A tech support question would be related to something in EE. Your question is more about Drupal than EE, and even if it wasn’t about Drupal, its would be about how to accomplish something in EE.
That said, I unfortunately, no nothing about Drupal. My thought would be you would need to create a custom SQL Query. All the conversations, I recall around Drupal were how to get data out of Drupal and into EE; though technically any solution should also work in reverse. Also, I found a link to someone who create a script that converts data from pivot to drupal. Not an exact match, but I’d assume the process would be similar in terms of set-up, since comments, categories, blogs, etc., would need to be transferred.