Question

我有一个加入猪的问题。我将首先向您介绍背景。这是我的代码：

-- START file loading
start_file = LOAD 'dir/start_file.csv' USING PigStorage(';') as (PARTRANGE:chararray,     COD_IPUSER:chararray);

-- trim
A = FOREACH start_file GENERATE TRIM(PARTRANGE) AS PARTRANGE, TRIM(COD_IPUSER) AS COD_IPUSER;

dump A;

给出输出：

(79.92.147.88,20140310)
(79.92.147.88,20140310)
(109.31.67.3,20140310)
(109.31.67.3,20140310)
(109.7.229.143,20140310)
(109.8.114.133,20140310)
(77.198.79.99,20140310)
(77.200.174.171,20140310)
(77.200.174.171,20140310)
(109.17.117.212,20140310)

加载其他文件：

-- Chargement du fichier recherche Hadopi
file2 = LOAD 'dir/file2.csv' USING PigStorage(';') as (IP_RECHERCHEE:chararray, DATE_HADO:chararray);

dump file2;

输出是这样的：

(2014/03/10 00:00:00,79.92.147.88)
(2014/03/10 00:00:01,79.92.147.88)
(2014/03/10 00:00:00,192.168.2.67)

现在，我想做一个左外连接。这是代码：

result = JOIN file2 by IP_RECHERCHEE LEFT OUTER, A by COD_IPUSER;
dump result;

输出是这样的：

(2014/03/10 00:00:00,79.92.147.88,,)
(2014/03/10 00:00:00,192.168.2.67,,)
(2014/03/10 00:00:01,79.92.147.88,,)

＆＃34; file2＆＃34;的所有记录在这里，这很好，但任何start_file都在这里。就像连接失败一样。

你知道问题出在哪里吗？

感谢。

Answer 1

您在file2中错误地标记了字段。您将第一个字段称为IP，将第二个字段称为日期，此时，如dump所示，情况恰恰相反。试试FOREACH file2 GENERATE IP_RECHERCHEE，您会看到您尝试加入的字段。

Answer 2

结果如预期。您正在调用Left outer join，它查找file2中的IP_RECHERCHEE字段与A的COD_IPUSER的匹配。
由于没有匹配，它返回file2中的所有IP_RECHERCHEE字段，并将null替换为来自的字段甲。的
显然2014/03/10 00:00:00 != 20140310

Answer 3

你的领域＆＃39;名称错误，您加入了错误的字段。您似乎想通过IP地址加入。

start_file = LOAD 'dir/start_file.csv' USING PigStorage(';') as (IP:chararray, PARTRANGE:chararray);

A = FOREACH start_file GENERATE TRIM(IP) AS IP, TRIM(PARTRANGE) AS PARTRANGE;

file2 = LOAD 'dir/file2.csv' USING PigStorage(';') as (DATE_HADO:chararray, IP:chararray);

我得到的是这个

(2014/03/10 00:00:00,192.168.2.67,,)
(2014/03/10 00:00:00,79.92.147.88,79.92.147.88,20140310)
(2014/03/10 00:00:00,79.92.147.88,79.92.147.88,20140310)
(2014/03/10 00:00:01,79.92.147.88,79.92.147.88,20140310)
(2014/03/10 00:00:01,79.92.147.88,79.92.147.88,20140310)

猪 - 加入并不起作用

3 个答案: