Read a Feather file (an Arrow IPC file)

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.read_feather() can read both the Feather Version 1 (V1), a legacy version available starting in 2016,and the Version 2 (V2), which is the Apache Arrow IPC file format.read_ipc_file() is an alias ofread_feather().

Usage

read_feather(file, col_select=NULL, as_data_frame=TRUE, mmap=TRUE)read_ipc_file(file, col_select=NULL, as_data_frame=TRUE, mmap=TRUE)

Arguments

file

A character file name or URI, connection,raw vector, anArrow input stream, or aFileSystem with path (SubTreeFileSystem).If a file name or URI, an ArrowInputStream will be opened andclosed when finished. If an input stream is provided, it will be leftopen.

col_select

A character vector of column names to keep, as in the"select" argument todata.table::fread(), or atidy selection specificationof columns, as used indplyr::select().

as_data_frame

Should the function return atibble (default) oran ArrowTable?

mmap

Logical: whether to memory-map the file (defaultTRUE)

Value

Atibble ifas_data_frame isTRUE (the default), or anArrowTable otherwise

See also

Examples

# We recommend the ".arrow" extension for Arrow IPC files (Feather V2).tf<-tempfile(fileext=".arrow")on.exit(unlink(tf))write_feather(mtcars,tf)df<-read_feather(tf)dim(df)#> [1] 32 11# Can select columnsdf<-read_feather(tf, col_select=starts_with("d"))