The Boundary class is only used internally by the planner to mark the boundaries between partitions within the element graph.
The Checkpoint pipe, if supported by the current planner, will force data to be persisted at the point in the tuple stream an instance of Checkpoint is inserted into the pipe assembly.
The CoGroup pipe allows for two or more tuple streams to join into a single stream via an optional
The GroupBy pipe groups the
The HashJoin pipe allows for two or more tuple streams to join into a single stream via a
The Merge Pipe allows for multiple branches, with the same fields to be spliced back into a single stream.
An Operator is a type of
Subclasses of SubAssembly encapsulate complex assemblies of
Class OperatorException is thrown during field name resolution during planning
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