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Takes a comparison function and the desired number of quantiles n, either globally or per-key. Using an approximation algorithm, it returns the minimum value, n-2 intermediate values, and the maximum value.


Example: to compute the quartiles of a PCollection of integers, we would use ApproximateQuantiles.globally(5). This will produce a list containing 5 values: the minimum value, Quartile 1 value, Quartile 2 value, Quartile 3 value, and the maximum value.