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https://issues.apache.org/jira/browse/SYSTEMML-875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Glenn Weidner resolved SYSTEMML-875.
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Resolution: Won't Fix
Fix Version/s: Not Applicable
Not required since separate branches/releases used for spark 1.6 vs spark 2.1.
> 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
> Fix For: Not Applicable
>
>
> 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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