mccheah commented on issue #45: Lazily submit tasks in ParallelIterable and add cancellation. URL: https://github.com/apache/incubator-iceberg/pull/45#issuecomment-446334195 Still looking over this, but separately I wonder if we've looked into Java's built in parallel iterators, or [spliterators](https://docs.oracle.com/javase/8/docs/api/java/util/Spliterator.html).
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