I am new to this hacker's job. What I was looking for was to record
the actual disk IO performed for arbituary query plan. I searched
in backend/executor but not sure if that was the right place to
add a tracer. would the /backend/storage be the place that controls
the actual I/O? btw, is there a way to find the definitions of all variables
or functions defined? I tried cscope but it is not good for such a large
framework.
thanks a lot
