Collect a Spark DataFrame into R.
R/sdf_wrapper.R
sdf_collect
Description
Collects a Spark dataframe into R.
Usage
sdf_collect(object, impl = c("row-wise", "row-wise-iter", "column-wise"), ...) Arguments
| Arguments | Description |
|---|---|
| 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. |