Utility UDFs 

                 Key: PIG-732
                 URL: https://issues.apache.org/jira/browse/PIG-732
             Project: Pig
          Issue Type: New Feature
            Reporter: Ankur
            Priority: Minor
         Attachments: udf.v1.patch

Two utility UDFs and their respective test cases.

1. TopN - Accepts number of tuples (N) to retain in output, field number (type 
long) to use for comparison, and an sorted/unsorted bag of tuples. It outputs a 
bag containing top N tuples.

2. SearchQuery - Accepts an encoded URL from any of the 4 search engines 
(Yahoo, Google, AOL, Live) and extracts and normalizes the search query present 
in it.

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