Was just taking a deeper look at XVector and wondered whether the concept
of an XVector being a single-range view of a Shared* object (essentially an
R vector wrapped in an externalptr to avoid copying?) could be applied to
iteration, where we could slide that range to represent each partition, for
example, without copying or creating new objects. Obviously, XVector would
need the same treatment as Rle to make it generally useful. But it would be
neat to do a bpaggregate without making new data.frames each iteration.
Thoughts?
Michael
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