Questions about parser code

Is it considered ok for the pstate data structures to have references to nodes
in the query tree? Or should they do copyObject() if they need to refer to
them? 

Is it ok to scribble on and reuse objects from the parse tree when generating
the transformed tree? Or should the transformed query object be built from
freshly allocated nodes?

--  Gregory Stark EnterpriseDB          http://www.enterprisedb.com