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

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: [EMAIL PROTECTED]
> To: [EMAIL PROTECTED]
>
> 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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The first element in the pair is the input number. Its mostly 0 for most
operators. For multi-input operators like join and cogroup, it will
range from 0 to (n - 1) where  n is the number of inputs.

Santhosh

-----Original Message-----
From: Dmitriy Ryaboy [mailto:[EMAIL PROTECTED]]
Sent: Thursday, November 05, 2009 9:05 PM
To: [EMAIL PROTECTED]
Subject: RequiredFields contents

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