Github user decibel commented on the issue:
https://github.com/apache/incubator-madlib/pull/78
Ok, I think I finally figured out what's going on here... you're keeping a
table of every possible destination, as well as the minimum cost to that
destination seen so far. The rest of this is just a question of walking through
the edges, throwing away any paths that would exceed the cost to a destination
that's already been seen, right?
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