Ankur updated PIG-732:

    Attachment: udf.v3.patch

> You assume that your are getting ....
1. Fixed. Implemented getArgToFuncMapping() as suggested.

> In the exec function, you check for 2 elements ....
2. Fixed. Changed to check for 3 arguments.

> Looks like if you inserted .....
Yep that is the desired behavior.  The need is to keep top-N tuples and throw 
away the remaining. The head of the queue in this case would be the minimum 

> You are not specifying tuple structure....
The output tuple structure is really based upon the tuple structure in the 
input bag (field(2)). I have changed this slightly as per my understanding. If 
this can be better written, please suggest.

> 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, udf.v2.patch, udf.v3.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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