Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/2527
Would a graph translator simplify the conversion from Long to String? You
can do `graph.run(new TranslateEdgeValues<...>(new StringToLong())` and write a
simple `public class StringToLong implements TranslateFunction<String, Long> {
...`. Or this could be an anonymous class.
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