layer_SparkR: Create a new layer
In SKKU-SKT/ggplot2.SparkR: Big Data Visualization for R and Spark

A layer is a combination of data, stat and geom with a potential position adjustment. Usually layers are created using geom_* or stat_* calls but it can also be created directly using this function.

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layer_SparkR(geom = NULL, stat = NULL, data = NULL, mapping = NULL,
  position = NULL, params = list(), inherit.aes = TRUE, subset = NULL,
  show.legend = NA)

`geom`	The geometric object to use display the data
`stat`	The statistical transformation to use on the data for this layer, as a string.
`data`	The data to be displayed in this layer.
`mapping`	Set of aesthetic mapping created by aes or aes_.
`position`	Position adjustment, either as a string, or the result of a call to a position adjustment function.
`params`	Additional parameters to the geom and stat.
`inherit.aes`	If FALSE, overrides the default aesthetics, rather ehan combining with them.
`subset`	DEPRECATED. Do not use now.
`show.legend`	logical. Should this layer be included in the legends?