Github user vasia commented on a diff in the pull request:
https://github.com/apache/flink/pull/1329#discussion_r44008073
--- Diff: docs/libs/gelly_guide.md ---
@@ -485,13 +485,15 @@ val networkWithWeights =
network.joinWithEdgesOnSource(vertexOutDegrees, (v1: Do
* <strong>Undirected</strong>: In Gelly, a `Graph` is always directed.
Undirected graphs can be represented by adding all opposite-direction edges to
a graph. For this purpose, Gelly provides the `getUndirected()` method.
-* <strong>Union</strong>: Gelly's `union()` method performs a union
operation on the vertex and edge sets of the specified graph and current graph.
Duplicate vertices are removed from the resulting `Graph`, while if duplicate
edges exists, these will be maintained.
+* <strong>Union</strong>: Gelly's `union()` method performs an union
operation on the vertex and edge sets of the specified graph and the current
graph. Duplicate vertices are removed from the resulting `Graph`, while if
duplicate edges exists, these will be maintained.
--- End diff --
I believe "a union" is the correct way ;)
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