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Question

我试图从Pig中的列中删除字符：\n、\t和\r，但是我得到了错误的输出。

以下是我正在做的事情：

qr_1 = LOAD 'hdfs://localhost:9000/sample.csv' USING PigStorage(',') as (Id:int,PostTypeId:int,AcceptedAnswerId:int,ParentId:int,CreationDate:chararray,DeletionDate:chararray,Score:int,ViewCount:int,Body:chararray,OwnerUserId:int,OwnerDisplayName:chararray,LastEditorUserId:int,LastEditorDisplayName:chararray,LastEditDate:chararray,LastActivityDate:chararray,Title:chararray,Tags:chararray,AnswerCount:int,CommentCount:int,FavoriteCount:int,ClosedDate:chararray,CommunityOwnedDate:chararray);
qr_1 = FOREACH qr_1 GENERATE Id .. ViewCount, REPLACE(Body,'\n','') as Body, OwnerUserId .. ;
qr_1 = FOREACH qr_1 GENERATE Id .. ViewCount, REPLACE(Body,'\r','') as Body, OwnerUserId .. ;   
qr_1 = FOREACH qr_1 GENERATE Id .. ViewCount, REPLACE(Body,'\t','') as Body, OwnerUserId .. ;   

输入：

5585779,1,5585800,,2011-04-07 18:27:54,,1432,3090250,"<p>How can I convert a <code>String</code> to an <code>int</code> in Java?</p>

<p>My String contains only numbers and I want to return the number it represents.</p>

<p>For example, given the string <code>""""1234""""</code> the result should be the number <code>1234</code>.</p>",537967,,2756409,user166390,2015-09-10 21:30:42,2016-03-07 00:42:49,Converting String to Int in Java?,<java><string><type-conversion>,12,0,239

输出：

(5585779,1,5585800,,2011-04-07 18:27:54,,1432,3090250,"<p>How can I convert a <code>String</code> to an <code>int</code> in Java?</p>,,,,,,,,,,,,,)
(,,,,,,,,,,,,,,,,,,,,,)
(,,,,,,,,,,,,,,,,,,,,)
(,,,,,,,,,,,,,,,,,,,,,)
(,,537967,,2756409,user166390,,,Converting String to Int in Java?,,12,0,239,,,,,,,,,)

我在做什么？

谢谢。

而且"\n“也没什么区别。

Answer 1

数据中有逗号，这就是为什么字段和模式不是matching.Use CSVLoader，然后使用替换命令替换'\t‘、'\n’、'\r‘

<p>For example, given the string