Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1205#discussion_r41377863
--- Diff: docs/libs/gelly_guide.md ---
@@ -194,6 +194,29 @@ val edgeTuples = env.readCsvFile[String, String,
Double]("path/to/edge/input")
val graph = Graph.fromTupleDataSet(vertexTuples, edgeTuples, env)
{% endhighlight %}
+
+* from a CSV file of Edge data and an optional CSV file of Vertex data.
+In this case, Gelly will convert each row from the Edge CSV file to an
`Edge`, where the first field will be the source ID, the second field will be
the target ID and the third field (if present) will be the edge value. The
parameter `readVertices` defines whether vertex data are provided. If
`readVertices` is set to `true`, then `pathVertices` must be specified. In this
case, each row from the Vertex CSV file will be converted to a `Vertex`, where
the first field will be the vertex ID and the second field will be the vertex
value. If `readVertices` is set to false, then Vertex data will be ignored and
vertices will be automatically created from the edges input.
+If the edges have no associated value, set the `hasEdgeValues` parameter
to `false`.
--- End diff --
Move this sentence after "... (if present) will be the edge value."?
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