read_parquet {arrow} | R Documentation |
'Parquet' is a columnar storage file format. This function enables you to read Parquet files into R.
read_parquet( file, col_select = NULL, as_data_frame = TRUE, props = ParquetArrowReaderProperties$create(), mmap = TRUE, ... )
file |
A character file name or URI, |
col_select |
A character vector of column names to keep, as in the
"select" argument to |
as_data_frame |
Should the function return a |
props |
|
mmap |
Use TRUE to use memory mapping where possible |
... |
Additional arguments passed to |
A tibble
if as_data_frame
is TRUE
(the default), or an
Arrow Table otherwise.
tf <- tempfile() on.exit(unlink(tf)) write_parquet(mtcars, tf) df <- read_parquet(tf, col_select = starts_with("d")) head(df)