Is there anyway to get list of table name, before raw parser is analyze?

Hi all,

Right now i am trying to understand how SQL parser is work. 

My question is there anyway to get list of table name and its atribut
before raw parser is analyze?

Because i like to understand how PostgreSQL "break-down" the asterik at
target list, specialy in "natural join" case where PostgreSQL can give
query result that have unabigous attribut and match the right join key.

Thank You.

-- 
Mohammad Heykal Abdillah <heykal.abdillah@gmail.com>