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Pig >> mail # user >> how to get input schema in UDF


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Re: how to get input schema in UDF
Chapter 10 in Alan Gates' excellent book "Programmin Pig" discusses this
issue.

Robert Yerex
Data Scientist
Civitas Leaning

On Mon, Aug 13, 2012 at 3:43 PM, Danfeng Li <[EMAIL PROTECTED]> wrote:

> I have a big, e.g. A: {(name: chararray,age: int)}, I wrote a udf which
> adds 1 more field in the tuple inside the bag. E.g. B: {(name:
> chararray,age: int, rank:int)}. Because the number of fields in the
> original bag is not fixed, e.g I can have one more field such as gender:int.
>
> In my udf, in order to generate the correct output schema, I need to get
> the input schema first. I tried to find some examples but couldn't, could
> someone show me how to do it?
>
> Thanks.
> Dan
>
>
--
Robert Yerex
Data Scientist
Civitas Learning
www.civitaslearning.com