Node Connectivity
There are 33 nodes that can be used as predessesor
for a node with an input port of type 
org.uni_leipzig.biggr.ports.FlinkPortObject.
Aggregates
Counts all nodes and edges per graph in the collection.
Combine
Creates the union/intersection/difference of two graph collections.
Graphs -> Graph
Combines all graphs in a collection into one logical graph.
Limit
Limits the number of graphs in a collection to the specified maximum.
Select
Filter logical graphs from a graph collection based on their associated graph head.
CSV DataSource
Loads graph data from a directory containing a logical graph or a graph collection in Gradoop CSV format.
Customizable CSV Reader
Load a graph from different vertex and edge csv files. The vertices and edges can be in an external representation.
EdgeList DataSource
Load graph data from a directory containing a file representing (labeled-)edge list.
GDL DataSource
Reads a graph collection from a GDL string.
CSV DataSink
Writes Gradoop graphs as CSV into a directory.