Given a numeric column within a Spark DataFrame, compute approximate quantiles (to some relative error).
sdf_quantile(x, column, probabilities = c(0, 0.25, 0.5, 0.75, 1), relative.error = 1e05)
x  An object coercable to a Spark DataFrame (typically, a


column  The column for which quantiles should be computed. 
probabilities  A numeric vector of probabilities, for which quantiles should be computed. 
relative.error  The relative error  lower values imply more precision in the computed quantiles. 