Hi,
I am also curious. I studied this and I guess that it could be the input index.
For example, foreach A generate .... Here A's index is 0 in the inputs of the
operator foreach.
Let me know if I am wrong.
Thanks,
Richard
> Date: Fri, 6 Nov 2009 00:04:36 -0500
> Subject: RequiredFields contents
> From: dvrya...@gmail.com
> To: pig-dev@hadoop.apache.org
>
> Hi all,
>
> I am looking at the RequiredFields class and it has this explanation
> of what getFields() returns:
>
> /**
> * List of fields required from the input. This includes fields that are
> * transformed, and thus are no longer the same fields. Using the example
> 'B
> * = foreach A generate $0, $2, $3, udf($1)' would produce the list (0,
> 0),
> * (0, 2), (0, 3), (0, 1). Note that the order is not guaranteed.
> */
>
>
> The second element of the pair is self-explanatory -- but what is the
> first element in the pair?
>
> Thanks,
> -Dmitriy
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