Hello, Tom.
Tom Lane пишет:
> You'll have better luck (and probably better performance, anyway) doing
> this with an ON UPDATE trigger, instead of a rule.
  But, can  your  know  something about  ".... attribute level rules". 
 This rules  supported in other releases PG. ?  
 And   -  i can't  know how in trigger_function i may release 
 this update .....   without forever loop.
 You have any idea?