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--https://github.com/slimandslam/pig-hive-wordcount/blob/master/wordcount.hql
DROP TABLE myinput;
DROP TABLE wordcount;
CREATE TABLE myinput (line STRING);
-- Load the text from the local (Linux) filesystem. This should be changed to HDFS
-- for any serious usage
LOAD DATA LOCAL INPATH ‘/home/username/mytext.txt‘ INTO TABLE myinput;
-- Create a table with the words cleaned and counted.
-- The Java regex removes all punctuation and control characters.
---reference http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html
CREATE TABLE wordcount AS
SELECT word, count(1) AS count
FROM (
SELECT EXPLODE(SPLIT(LOWER(REGEXP_REPLACE(line,‘[\\p{Punct},\\p{Cntrl}]‘,‘‘)),‘ ‘))
AS word FROM myinput
) words
GROUP BY word
-- Sort the output by count with the highest counts first
ORDER BY count DESC, word ASC;
-- Make the output look like the output of the Pig DUMP function
-- so that we can diff this output with the Pig wordcount output
SELECT CONCAT_WS(‘,‘, CONCAT("\(",word), CONCAT(count,"\)")) FROM wordcount;
--EXPLODE is a udtf function, used to convert each element in the array to a row.
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原文地址：http://www.cnblogs.com/huaxiaoyao/p/4347040.html
