WIP: Cross join via batch broadcast #358
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Signed-off-by: Petros Angelatos <petrosagg@gmail.com>
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The main contribution of this PR is the
AbomArctype which behaves like anArc<T>but it's safe to be Abomonated. This allows one to arrange a collection and get back batches that areSend,Clone, andAbomonationwhich allow them to be sent to other workers locally or over the network.I have provided an example that tries to use this mechanism to implement a cross-join by partitioning the arrangement among workers and then broadcast the new batches for joining. That implementation is currently incorrect because I ran out of steam, but it is enough to demonstrate how a
Batchcan be broadcasted to all workers and then combined with the worker-local arrangement state.