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The columns are defined in the step 3 pig script
/**
* Finally, group the values by the actual count and the bin they were assigned
* to, and compute the sum of the values and the total number of observations in
* each bin to use as input to the external optimization routine.
*/
table_blocks = GROUP table_bins BY (actual, bin);
stats = FOREACH table_blocks GENERATE group.actual as actual, group.bin as bin,
SUM(table_bins.value) as expected, COUNT(table_bins) as weight;
the rows from the stats generate call then get stored into the directory we do a getmerge on to form the CSV file.
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