Given a numeric column within a Spark DataFrame, compute approximate quantiles.
sdf_quantile( x, column, probabilities = c(0, 0.25, 0.5, 0.75, 1), relative.error = 1e-05, weight.column = NULL )
The column(s) for which quantiles should be computed. Multiple columns are only supported in Spark 2.0+.
A numeric vector of probabilities, for which quantiles should be computed.
The maximal possible difference between the actual percentile of a result and its expected percentile (e.g., if `relative.error` is 0.01 and `probabilities` is 0.95, then any value between the 94th and 96th percentile will be considered an acceptable approximation).
If not NULL, then a generalized version of the Greenwald- Khanna algorithm will be run to compute weighted percentiles, with each sample from `column` having a relative weight specified by the corresponding value in `weight.column`. The weights can be considered as relative frequencies of sample data points.