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?


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