single-row subqueries seer -- join plan?

i've only detected seer lets following:

select foo.a, (select c 
               bar 
               where foo.a = bar.a) 
from foo

as enlarged wholly quarrel bar matches any quarrel foo.

the explain digest i pl/sql developer this:

select statement, idea = all_rows               
 list opening full  bar 
 list opening full  foo 

this doesn't indeed mention tables joined. co-worker asserted some-more fit doing unchanging join. true? join plan such name statement, since doesn't arrangement adult explain plan?

thanks.