Hadoop 如何在多字段pig中连接两个关系

我有两个CSV文件：

1-fertilliy.csv：

2-Life Expectence.csv：

我想加入他们的pig，结果如下：

我是新来的猪，我不能得到正确的答案，但这是我的代码：

fertility = LOAD 'fertility' USING org.apache.hcatalog.pig.HCatLoader();

lifeExpectency = LOAD 'lifeExpectency' USING   org.apache.hcatalog.pig.HCatLoader();

A = JOIN fertility by country, lifeExpectency by country; 

B = JOIN fertility by year, lifeExpectency by year; 

C = UNION A,B;

DUMP C; 

以下是我的代码的结果：

fertility = LOAD 'fertility' USING org.apache.hcatalog.pig.HCatLoader();

lifeExpectency = LOAD 'lifeExpectency' USING   org.apache.hcatalog.pig.HCatLoader();

A = JOIN fertility by country, lifeExpectency by country; 

B = JOIN fertility by year, lifeExpectency by year; 

C = UNION A,B;

DUMP C; 

---

您可以按国家和年份进行联接，并选择最终输出所需的必要列

fertility = LOAD 'fertility' USING org.apache.hcatalog.pig.HCatLoader();
lifeExpectency = LOAD 'lifeExpectency' USING   org.apache.hcatalog.pig.HCatLoader();

A = JOIN fertility by (country,year), lifeExpectency by (country,year); 
B = FOREACH A GENERATE  fertility::country,fertility::year,fertility::fertility,lifeExpectency::lifeExpectency;  
DUMP B; 

---

您可以按国家和年份进行联接，并选择最终输出所需的必要列

fertility = LOAD 'fertility' USING org.apache.hcatalog.pig.HCatLoader();
lifeExpectency = LOAD 'lifeExpectency' USING   org.apache.hcatalog.pig.HCatLoader();

A = JOIN fertility by (country,year), lifeExpectency by (country,year); 
B = FOREACH A GENERATE  fertility::country,fertility::year,fertility::fertility,lifeExpectency::lifeExpectency;  
DUMP B; 

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谢谢，成功了。只要用转储B替换转储C，我就可以接受它作为正确答案。@AliZuhair更新。提前谢谢你的接受。谢谢你，它成功了。只要用转储B替换转储C，我就可以接受它作为正确答案。@AliZuhair更新。提前感谢您的接受。