hof_forall: Checks whether all elements in an array satisfy a predicate

In rstudio/sparklyr: R Interface to Apache Spark

Checks whether all elements in an array satisfy a predicate

Description

Checks whether the predicate specified holds for all elements in an array (this is essentially a dplyr wrapper to the 'forall(expr, pred)' higher- order function, which is supported since Spark 3.0)

Usage

hof_forall(x, pred, expr = NULL, dest_col = NULL, ...)

Arguments

x	The Spark data frame to be processed
pred	The predicate to test (it should take an array element as argument and return a boolean value)
expr	The array being tested, could be any SQL expression evaluating to an array (default: the last column of the Spark data frame)
dest_col	Column to store the boolean result (default: expr)
...	Additional params to dplyr::mutate

Examples

## Not run: 

sc <- spark_connect(master = "local", version = "3.0.0")
df <- dplyr::tibble(
  x = list(c(1, 2, 3, 4, 5), c(6, 7, 8, 9, 10)),
  y = list(c(1, 4, 2, 8, 5), c(7, 1, 4, 2, 8)),
)
sdf <- sdf_copy_to(sc, df, overwrite = TRUE)

all_positive_tbl <- sdf %>%
  hof_forall(pred = ~ .x > 0, expr = y, dest_col = all_positive) %>%
  dplyr::select(all_positive)

## End(Not run)

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