Question

我有两组元组，我想通过第一个元素将它们连接起来并将其他部分合并为一个元组，想知道如何在Hadoop上的Pig中实现它？

输入两个元组集，

1,(1,2)
2,(2,3)

1,(b,c,b,c)
2,(c,d,c,d)

预期产出，

1,(1,2,b,c,b,c)
2,(2,3,c,d,c,d)

提前谢谢，林

Answer 1

值得考虑的想法......

输入：

dataA：

1   (1,2)
2   (2,3)

<强>数据B：

1   (b,c,b,c)
2   (c,d,c,d)

猪脚本：

A = LOAD 'dataA'  USING  PigStorage('\t') AS  (aid:long, atuple : tuple(af1:long, af2:long));
B = LOAD 'dataB'  USING  PigStorage('\t') AS  (bid:long, btuple : tuple(bf1:chararray, bf2:chararray, bf3:chararray, bf4:chararray));
C = JOIN A BY aid, B BY bid;
D = FOREACH C GENERATE aid AS id, FLATTEN(atuple) AS (af1:long, af2:long) , FLATTEN(btuple) AS (bf1:chararray, bf2:chararray, bf3:chararray, bf4:chararray);
E = FOREACH D GENERATE id, (af1..bf4);
DUMP E;

输出：DUMP E：

(1,(1,2,b,c,b,c))
(2,(2,3,c,d,c,d))

在Pig中合并元组

1 个答案: