Add a function that can build an EdgePartition faster.

[ArcherShao]

If user can make sure every edge add by the order, use this function to build an EdgePartition will be faster.

[AmplabJenkins]

Can one of the admins verify this patch?

[rxin]

Jenkins, add to whitelist.

[AmplabJenkins]

Merged build triggered.

[AmplabJenkins]

Merged build started.

[AmplabJenkins]

Merged build finished.

[AmplabJenkins]

Refer to this link for build results: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/14901/

[rxin]

@ArcherShao do you mind fixing the style error? You can verify that locally also using sbt/sbt scalastyle

[AmplabJenkins]

Merged build triggered.

[AmplabJenkins]

Merged build started.

[AmplabJenkins]

Merged build finished.

[AmplabJenkins]

Refer to this link for build results: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/14982/

[ArcherShao]

PrimitiveKeyOpenHashMap has changed to GraphXPrimitiveKeyOpenHashMap, I will send a new pull request.

[rxin]

@ArcherShao if you are sending / have sent a new pull request, do you mind closing this one? Thanks!