SDB and redundant queries

[Devin Bayer]

Hello.  I have been writing a driver for bind SDB and I have been  
getting some odd behavior.  Every query generates four function  
calls.  Why the last two?

First query_find() calls dns_db_find(), which eventually calls an SDB  
driver's lookup and authority functions.  Then in the addauth section  
of query_find, query_addns() is called, which calls dns_db_find()  
again.  Both times lookup is called with the second option "@".

This is very redundant, since the same data is returned the second  
time.  Why does query_addns() need to be called, since dns_db_find()  
calls the SDB's authority function?  Isn't the authority information  
already in the answer?

Please provide any insight into this behavior. Maybe my SDB driver is  
not responding correctly. Thanks for your time, Devin Bayer