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.
From: Dmitriy Ryaboy [mailto:[EMAIL PROTECTED]]
Sent: Thursday, November 05, 2009 9:05 PM
To: [EMAIL PROTECTED]
Subject: RequiredFields contents
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
* transformed, and thus are no longer the same fields. Using the
* = foreach A generate $0, $2, $3, udf($1)' would produce the list
* (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?