Tom Lane wrote:

> So, the attached patch just bites the bullet and adds explicit output
> tlist information to struct Path.  I did set things up so that the cost
> is only one pointer in each Path in the typical case where Paths emit
> the set of Vars needed from their relation; in that case, they just
> point to a default PathTarget struct embedded in the parent RelOptInfo.
> A Path emitting something else will need its own PathTarget struct.

Hmm, I wonder if this can be used to attack the problem here in a more
sensible manner:

Álvaro Herrera      
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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