20. The method of claim 19 , wherein generating a relational query comprises: performing a traversal of the current expression tree; and generating the relational query based on the current expression tree.
20. The method of claim 19 , wherein generating a relational query comprises: performing a traversal of the current expression tree; and generating the relational query based on the current expression tree. 21. The method of claim 20 , further comprising caching the current expression tree created for relational queries generated.