inlining SQL functions

Hi,

Is there a reason why only a table free SQL functions are allowed to be inlined ?  I wonder why a simple SQL function
containingonly a SELECT * FROM table can't be expanded inline ? Is there an interest in expanding the class of SQL
functionsthat can be inlined ?   

Thanks,
--
Alexey Klyukin                    http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc