read_feather {arrow}R Documentation

Read a Feather file

Description

Feather provides binary columnar serialization for data frames. It is designed to make reading and writing data frames efficient, and to make sharing data across data analysis languages easy. This function reads both the original, limited specification of the format and the version 2 specification, which is the Apache Arrow IPC file format.

Usage

read_feather(file, col_select = NULL, as_data_frame = TRUE, ...)

Arguments

file

A character file name or URI, raw vector, an Arrow input stream, or a FileSystem with path (SubTreeFileSystem). If a file name or URI, an Arrow InputStream will be opened and closed when finished. If an input stream is provided, it will be left open.

col_select

A character vector of column names to keep, as in the "select" argument to data.table::fread(), or a tidy selection specification of columns, as used in dplyr::select().

as_data_frame

Should the function return a data.frame (default) or an Arrow Table?

...

additional parameters, passed to make_readable_file().

Value

A data.frame if as_data_frame is TRUE (the default), or an Arrow Table otherwise

See Also

FeatherReader and RecordBatchReader for lower-level access to reading Arrow IPC data.

Examples


tf <- tempfile()
on.exit(unlink(tf))
write_feather(mtcars, tf)
df <- read_feather(tf)
dim(df)
# Can select columns
df <- read_feather(tf, col_select = starts_with("d"))


[Package arrow version 5.0.0.2 Index]