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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2785) Implement Graph's fromCsvReader in Gelly-Scala
Date Wed, 07 Oct 2015 11:14:26 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14946685#comment-14946685
] 

ASF GitHub Bot commented on FLINK-2785:
---------------------------------------

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."?


> Implement Graph's fromCsvReader in Gelly-Scala
> ----------------------------------------------
>
>                 Key: FLINK-2785
>                 URL: https://issues.apache.org/jira/browse/FLINK-2785
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Gelly
>            Reporter: Vasia Kalavri
>            Assignee: Vasia Kalavri
>            Priority: Minor
>
> Graphs's {{fromCsvReader}} method is currently missing from the Gelly Scala API. It cannot
be implemented as a simple wrapper over the Java method, because the Java method returns a
{{GraphCsvReader}}, which in return creates a Graph after specifying types with appropriate
methods. The Scala version of the method can be more nicely implemented using the {{ScalaCsvInputFormat}}.



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