Could you Bruce please add a TODO item for this feature?
The description could look something like this:

Eliminate the table T from the query/subquery if the following requirements
are satisfied:
1. T is left joined
2. T is referenced only in the join expression where it is left joined
3. the left join's join expression is a simple equality expression like
T1.C1=T2.C2; T1!=T2 and (T==T1 or T==T2)
4. the column of T in the join exression is the primary key of T


I hope it is comlete.
I think this is the simplest case, so we should start with this.


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