#' Retrieve a Spark DataFrame
#'
#' This S3 generic is used to access a Spark DataFrame object (as a Java
#' object reference) from an \R object.
#'
#' @param x An \R object wrapping, or containing, a Spark DataFrame.
#' @param ... Optional arguments; currently unused.
#' @return A \code{\link{spark_jobj}} representing a Java object reference
#' to a Spark DataFrame.
#'
#' @export
spark_dataframe <- function(x, ...) {
UseMethod("spark_dataframe")
}
#' @export
spark_dataframe.default <- function(x, ...) {
stop("Unable to retrieve a Spark DataFrame from object of class ",
paste(class(x), collapse = " "),
call. = FALSE
)
}
#' @export
spark_dataframe.spark_jobj <- function(x, ...) {
x
}
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