Christopher Rost

Duplicate with #12951 ?

> Solved? Is their some way how to support on this? Still an open issue. See also the duplicate #12951.

I think we should talk about that again ... the deletion of the existing graph head and addition of a new one is suspect ... maybe we should first list...

You know that there is a [`VertexRandomFilter`](https://github.com/dbs-leipzig/gradoop/blob/master/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/sampling/functions/VertexRandomFilter.java) already implemented?

The default threshold of Spotbugs is `medium` which means, that low confidence issues are suppressed. We can configure this by setting configuration `Low/Medium/High`. Setting it to low, the build fails...

Change year in headers from 2020 to 2021.

@timo95 for further commits, please add the issue number as prefix of your commit message ;)

The output of the Evolution operators should be changed from timestamped degrees to intervals.

I agree. We should change the name.

Problem here is that we used this call in several publications. Thus, we could change the name of the operator itself, but not of the Grala call (LogGraph.verify())