FeatherReader

This class enables you to interact with Feather files. Create
one to connect to a file or other InputStream, and call <code>Read()</code> on it to
make an <code>arrow::Table</code>. See its usage in <code><a rd-options="=read_feather" href="/link/read_feather()?package=arrow&version=2.0.0&to=%3Dread_feather" data-mini-rdoc="=read_feather::read_feather()">read_feather()</a></code>.

'Apache' 'Arrow' <https://arrow.apache.org/> is a cross-language
development platform for in-memory data. It specifies a standardized
language-independent columnar memory format for flat and hierarchical data,
organized for efficient analytic operations on modern hardware. This
package provides an interface to the 'Arrow C++' library.

Neal Richardson

arrow

Integration to 'Apache' 'Arrow'

Romain François

Jeroen Ooms

Javier Luraschi

Jeffrey Wong

Apache Arrow 

FeatherReader function

The <code>FeatherReader$create()</code> factory method instantiates the object and
takes the following arguments:<ul>
<li><code>file</code> an Arrow file connection object inheriting from <code>RandomAccessFile</code>.</li>
<li><code>mmap</code> Logical: whether to memory-map the file (default <code>TRUE</code>)</li>
<li><code>...</code> Additional arguments, currently ignored</li>
</ul>

Factory

<ul>
<li><code>$Read(columns)</code>: Returns a <code>Table</code> of the selected columns, a vector of
integer indices</li>
<li><code>$version</code>: Active binding, returns <code>1</code> or <code>2</code>, according to the Feather
file version</li>
</ul>

Methods

This class enables you to interact with Feather files. Create
one to connect to a file or other InputStream, and call <code>Read()</code> on it to
make an <code>arrow::Table</code>. See its usage in <code><a rd-options='=read_feather' href='read_feather()'>read_feather()</a></code>.

FeatherReader: FeatherReader class

Description

Arguments

Factory

Methods