Glenn Weidner created SYSTEMML-875:
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Summary: Wrap ArrayList with LazyIterableIterator
Key: SYSTEMML-875
URL: https://issues.apache.org/jira/browse/SYSTEMML-875
Project: SystemML
Issue Type: Sub-task
Components: Runtime
Reporter: Glenn Weidner
Add LazyIterableIterator wrappers for classes implementing PairFlatMapFunction
but returning a collection such as:
ArrayList<Tuple2<MatrixIndexes, MatrixBlock>> ret = new
ArrayList<Tuple2<MatrixIndexes, MatrixBlock>>();
Wrapping the ArrayList with LazyIterableIterator allows the return value to be
both Iterable and Iterator to maintain backward compatibility. An example of a
class where this pattern would need to be refactored is:
runtime.instructions.spark.CumulativeOffsetSPInstruction
(RDDCumSplitFunction.call).
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