Fix a conceptual error in my patch of 2007-10-26 that avoided considering
clauseless joins of relations that have unexploited join clauses. Rather than looking at every other base relation in the query, the correct thing is to examine the other relations in the "initial_rels" list of the current make_rel_from_joinlist() invocation, because those are what we actually have the ability to join against. This might be a subset of the whole query in cases where join_collapse_limit or from_collapse_limit or full joins have prevented merging the whole query into a single join problem. This is a bit untidy because we have to pass those rels down through a new PlannerInfo field, but it's necessary. Per bug #3865 from Oleg Kharin.
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