Chapter 4

data movement (copying and distributing)


(b). In the second transformation the rows are copied, so all the unassigned rows reach the dummy step. In the first transformation the rows are distributed, so to the filter step arrives half of the rows. When you do the preview, you see only the unassigned tasks for this half; you don't see the unassigned tasks that went to the other stream.

splitting a stream


(c). Both (a) and (b) solve the situation.

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