传递一个带空格的参数

Question

当我用如下所示的命令运行我的脚本时，用 police_force 参数设置为 "Surrey Police"它给我一个错误

"ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1000: Error during parsing. File not found: Police"" 

如果我把值传给 "Surrey_Police"，它运行得很好，但没有返回任何东西。

-- knownvalues: dataset presented
-- date1: one date of comparison
-- date2: 2nd date of comparison
-- police_force: falls within 
-- crime_type
-- Usage: exec -param knownvalues='/user/cw/input/all.txt' -param date1='2017-05' -param date2='2017-06' -param police_force="Surrey Police" /home/xiaorui/CW/compare_crime.pig


knownvalues = LOAD '$knownvalues' USING PigStorage(',') AS (crimeid:chararray,month:chararray,reportedby:chararray,fallswithin:chararray,longitude:float,latitude:float,location:chararray,lsoacode:chararray,lsoaname:chararray,crimetype:chararray,lastoutcome:chararray,context:chararray);


knownvalues = SAMPLE knownvalues 0.00001;

location = FILTER knownvalues BY (fallswithin MATCHES $police_force);

first_date = FILTER location BY (month MATCHES '$date1');

second_date = FILTER location BY (month MATCHES '$date2');

DUMP first_date;

如果我使用下面这一行，代码就能正常工作。

location = FILTER knownvalues BY (fallswithin MATCHES 'Surrey Police');

Answer 1

我通过以下步骤实现了。

a.)首先police_force from filter命令应该像下面这样用单引号括起来.location = FILTER knownvalues BY (fallswithin MATCHES) '$police_force');

b.) 其次我们需要 包括转义字符() 也 单引号或双引号 在执行命令中。

pig -x local -param knownvalues='/home/ec2-user/data' -param police_force="Surrey\ Police" /home/ec2-user/test.pig
or
pig -x local -param knownvalues='/home/ec2-user/data' -param police_force='Surrey\ Police' /home/ec2-user/test.pig

下面是我的测试代码和命令。

猪输入数据文件：猫数据

mary,19
john,18
joe,18
Surrey Police,20

猪样本代码：猫测试.猪

knownvalues = LOAD '$knownvalues' USING PigStorage(',') AS (name:chararray,age:int);
dump knownvalues;
describe knownvalues;

location = FILTER knownvalues BY (name MATCHES '$police_force');

dump location;
describe location;

输出：

负载后：

(mary,19)
(john,18)
(joe,18)
(Surrey Police,20)
knownvalues: {name: chararray,age: int}

过滤后：

(Surrey Police,20)
location: {name: chararray,age: int}