sdf_collect: Collect a Spark DataFrame into R.

In rstudio/sparklyr: R Interface to Apache Spark

Collect a Spark DataFrame into R.

Description

Collects a Spark dataframe into R.

Usage

sdf_collect(object, impl = c("row-wise", "row-wise-iter", "column-wise"), ...)

Arguments

object	Spark dataframe to collect
impl	Which implementation to use while collecting Spark dataframe - row-wise: fetch the entire dataframe into memory and then process it row-by-row - row-wise-iter: iterate through the dataframe using RDD local iterator, processing one row at a time (hence reducing memory footprint) - column-wise: fetch the entire dataframe into memory and then process it column-by-column NOTE: (1) this will not apply to streaming or arrow use cases (2) this parameter will only affect implementation detail, and will not affect result of 'sdf_collect', and should only be set if performance profiling indicates any particular choice will be significantly better than the default choice ("row-wise")
...	Additional options.

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