func (c *callbackDatastore) Batch() (ds.Batch, error) { return ds.NewBasicBatch(c), nil }
func (c *queryTestDS) Batch() (ds.Batch, error) { return ds.NewBasicBatch(c), nil }
func (dds *delayed) Batch() (ds.Batch, error) { return ds.NewBasicBatch(dds), nil }