Thanks for your answer. However, there has been a missunderstanding here. My question is related to control the execution in parallel of different parts of code, similarly to PIG, where there is a planning phase before the execution.


On Wed, Jul 23, 2014 at 1:46 PM, chutium <teng.qiu@gmail.com> wrote:
it seems union should work for this scenario

in part C, try to use: output_a union output_b



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