Plannode with a righttree

Hi!

I'm trying to implement a top level node that must have a lefttree and a
righttree. The lefttree consists of a regular tree of other nodes required
for the query (that I let postgres' optimizer build on its own) and the
righttree should be a table scan (of a table called for in the FROM clause
of the query). My problem is, that I don't manage to create that scan node
for the table and properly attach it to my node.

Any help or pointers will be greatly appretiated...

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Vanessa V. Gonzalez D.