Gourav Kumar <gourav1905(at)gmail(dot)com> writes:
> My objective is to construct join graph from a given query.
> A join graph, has a node for each relation involved in a join, and an edge
> between two relations if they share a join predicate among them.
Hm, well, you could adapt the logic in have_relevant_joinclause() and
have_relevant_eclass_joinclause(). Or maybe you could just use them
as-is ... depends on what you have in mind to do with join clauses
that mention 3 or more relations.
regards, tom lane