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This class enables you to interact with Feather files. Create
one to connect to a file or other InputStream, and call Read() on it to
make an arrow::Table. See its usage in read_feather().
The FeatherTableReader$create() factory method instantiates the object and
takes the following arguments:
file A character file name, raw vector, or Arrow file connection object
(e.g. RandomAccessFile).
mmap Logical: whether to memory-map the file (default TRUE)
... Additional arguments, currently ignored
$GetDescription()
$HasDescription()
$version()
$num_rows()
$num_columns()
$GetColumnName()
$GetColumn()
$Read(columns)