pig支持的类型转换（cast）

Pig Latin supports casts as shown in this table.

将字符类型转化做int是可以的。测试如下

pig 代码：

%default testFile /user/wizad/test/lmj/test_file.txt

test_data = http://www.mamicode.com/LOAD ‘$testFile‘ USING PigStorage(‘,‘)
AS
(str1:chararray,
 number:int
);
 
dump test_data;
my_result = foreach test_data generate (int)SUBSTRING(str1,0,3);
dump my_result;
describe my_result;

--myts = sample g_log 0.0001;
--myts = limit g_log 10;
--dump myts;
--STORE myts INTO ‘/user/wizad/tmp/my‘ USING PigStorage(‘,‘);

pig强制转换（字符到整数）：‘01’到1的转化