stat_sum: Count two dimensional variables and present size of point
In SKKU-SKT/ggplot2.SparkR: Big Data Visualization for R and Spark

Count two dimensional variables and present size of point

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stat_sum(mapping = NULL, data = NULL, geom = "point",
  position = "identity", na.rm = FALSE, show.legend = NA,
  inherit.aes = TRUE, ...)

`mapping`	Set of aesthetic mapping created by aes or aes_.
`data`	The data to be displayed in this layer.
`geom`	The geometric object to use display the data
`position`	Position adjustment, either as a string, or the result of a call to a position adjustment function.
`na.rm`	If FALSE, removes missing values with a warning (not used in ggplot2.SparkR).
`show.legend`	logical. Should this layer be included in the legends?
`inherit.aes`	If FALSE, overrides the default aesthetics, rather ehan combining with them.
`...`	other arguments passed on to layer.