hof_map_filter: Filters a map

In rstudio/sparklyr: R Interface to Apache Spark

Filters a map

Description

Filters entries in a map using the function specified (this is essentially a dplyr wrapper to the 'map_filter(expr, func)' higher- order function, which is supported since Spark 3.0)

Usage

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

Arguments

x	The Spark data frame to be processed
func	The filter function to apply (it should take (key, value) as arguments and return a boolean value, with FALSE indicating the key-value pair should be discarded and TRUE otherwise)
expr	The map being filtered, could be any SQL expression evaluating to a map (default: the last column of the Spark data frame)
dest_col	Column to store the filtered result (default: expr)
...	Additional params to dplyr::mutate

Examples

## Not run: 

library(sparklyr)
sc <- spark_connect(master = "local", version = "3.0.0")
sdf <- sdf_len(sc, 1) %>% dplyr::mutate(m = map(1, 0, 2, 2, 3, -1))
filtered_sdf <- sdf %>% hof_map_filter(~ .x > .y)

## End(Not run)

rstudio/sparklyr documentation built on Sept. 18, 2024, 6:10 a.m.