mrocklin / dask / 2208

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Support delayed and single-partition bags in Bag.join

This can significantly improve performance when joining against larger
collections due to serialization overhead on the distributed scheduler.

There is still more work to do here for multi-partition joins.

Experiments also show that GC is having a profound effect on performance
here.

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14613 of 15876 relevant lines covered (92.04%)

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