Marko A. Rodriguez created TINKERPOP-1162:
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             Summary: Add VertexProgram.getTransientComputeKeys() for removing 
scratch-data.
                 Key: TINKERPOP-1162
                 URL: https://issues.apache.org/jira/browse/TINKERPOP-1162
             Project: TinkerPop
          Issue Type: Improvement
          Components: process
    Affects Versions: 3.1.0-incubating
            Reporter: Marko A. Rodriguez
            Assignee: Marko A. Rodriguez
             Fix For: 3.2.0-incubating


When you run a PageRankVertexProgram or a PeerPressureVertexProgram, you have 
an {{edgeCount}} property which is used for determining the weight 
distribution. This is just some "scratch pad data." We need a way to tell the 
GraphComputer which properties are "scratch pad" and thus, delete them before 
outputting the `ComputerResult`.

I propose:

{code}
Set<String> VertexProgram.getTransientComputeKeys()
{code}

We can have a default that returns {{Collections.emptySet()}}. This would be 
breaking as the GraphComputer provider will need to handle dropping such 
properties. This, of course, will be verified in a 
{{GraphComputerTest.shouldSupportTransientProperties()}}.



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