"EXPLAIN (format XML) " command in PostgreSQL9.3.4 gives the plan chosen by
the optimizer in XML format. In my program, I have to extract certain data
about optimizer plan from this XML output. I am using *LibXML2* library for
parsing the XML. I had successfully extracted information about which
relations are involved and what joins are used by parsing the XML. But
I am *unable
to extract the* *order of joining the relations from the XML output*. I
conceptually understood that the reverse level order traversal of binary
tree representation of the XML plan will give correct ordering of joins
applied. But I could not figure out how do I get that from the XML? Does
libXML2 support anything of this sort? If not how should I proceed to
tackle this?
