b715933fc6
Pregel code contains two consecutive joins:
```
g.vertices.innerJoin(messages)(vprog)
...
g = g.outerJoinVertices(newVerts)
{ (vid, old, newOpt) => newOpt.getOrElse(old) }
```
This can be simplified with one join. ankurdave proposed a patch based on our discussion in the mailing list: https://www.mail-archive.com/devspark.apache.org/msg10316.html
Author: Alexander Ulanov <nashb@yandex.ru>
Closes #7749 from avulanov/SPARK-9436-pregel and squashes the following commits:
8568e06 [Alexander Ulanov] Pregel simplification patch
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