hof_transform

Transform Array Column

Description

Apply an element-wise transformation function to an array column (this is essentially a dplyr wrapper for the transform(array<T>, function<T, U>): array<U> and the transform(array<T>, function<T, Int, U>): array<U> built-in Spark SQL functions)

Usage

hof_transform(x, func, expr = NULL, dest_col = NULL, ...)

Arguments

Argument	Description
x	The Spark data frame to transform
func	The transformation to apply
expr	The array being transformed, could be any SQL expression evaluating to an array

(default: the last column of the Spark data frame) dest_col | Column to store the transformed result (default: expr) … | Additional params to dplyr::mutate

Examples

library(sparklyr)
sc <- spark_connect(master = "local")
# applies the (x -> x * x) transformation to elements of all arrays
copy_to(sc, tibble::tibble(arr = list(1:5, 21:25))) %>%
  hof_transform(~ .x * .x)