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Posted to issues@systemml.apache.org by "Glenn Weidner (JIRA)" <ji...@apache.org> on 2016/08/28 16:44:20 UTC

[jira] [Created] (SYSTEMML-875) Wrap ArrayList with LazyIterableIterator

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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