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Attribute include ``result_proxies``, which is a sequence of the
actual :class:`_engine.ResultProxy` objects,
as well as ``aggregate_rowcount``
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.. versionadded:: 1.3
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should set whatever state on the instance to mark it in the future as
participating in that shard.
:param id_chooser: A callable, passed a query and a tuple of identity
values, which should return a list of shard ids where the ID might
reside. The databases will be queried in the order of this listing.
:param query_chooser: For a given Query, returns the list of shard_ids
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