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Data and example code for Programming Pig, by Alan F. Gates

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I just tried the PageRank example from Chapter 9, but it gets stuck in the reduce phase of a process on the 5th iteration of the algorithm. Digging a little...

fix was to change `dividends = load 'NYSE_dividends' as (exchange, symbol, date, dividend);` to `dividends = load '../../data/NYSE_dividends' as (exchange, symbol, date, dividend);`

Had to explicitly import pig class to make this work (see https://pig.apache.org/docs/r0.9.0/cont.html#invocation-basics)