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pig java udf 본문
https://github.com/alanfgates/programmingpig/blob/master/udfs/java/com/acme/math/Pow.java
$ hadoop version
$ pig -version
$ javac -cp /usr/lib/pig/\* -d Pow Pow.java ; jar cvf pow.jar -C Pow .
$ cat pow.pig
$ hadoop fs -cat /tmp/pow_input.txt
2 3
3 2
$ pig -f pow.pig
$ hadoop fs -cat /tmp/pow_output/part-m-00000
2 3 8
3 2 9
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