The<AHREF="../../backend/optimizer">optimizer</A> takes the Query

structure and generates an optimal<A

HREF="../..//include/nodes/plannodes.h">Plan,</A> which contains the

HREF="../../include/nodes/plannodes.h">Plan,</A> which contains the

operations to be performed to execute the query. The<A

HREF="../../backend/optimizer/path">path</A> module determines the best

table join order and join type of each table in the RangeTable, using