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定义
A = load '/data/rawevents/20100819/data' as (alpha:int, beta:chararray, …);
B = filter A by bot_finder(zeta) = 0;
…
store Z into 'data/processedevents/20100819/data';
A = load 'rawevents' using HCatLoader();
B = filter A by date = '20100819' and by bot_finder(zeta) = 0;
…
store Z into 'processedevents' using HCatStorer("date=20100819");
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