Posible planner improvement?

[Albert Cervera Areny <albert(at)sedifa(dot)com>]

I've got a query similar to this:

select * from t1, t2 where t1.id > 158507 and t1.id = t2.id;

That took > 84 minutes (the query was a bit longer but this is the part that 
made the difference) after a little change the query took ~1 second:

select * from t1, t2 where t1.id > 158507 and t2.id > 158507 and t1.id = 
t2.id;

The change is pretty simple and it seems (note I don't have a clue on how the 
planner works) it'd be possible for the planner to make this assumption 
itself. Do you think it is really feasible/appropiate?