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<img src="" class="logo" alt=""><h1>Read serialized streams of Arrow data</h1>
<small class="dont-index">Source: <a href="https://github.com/apache/arrow-nanoarrow/blob/main/r/R/ipc.R" class="external-link"><code>R/ipc.R</code></a></small>
<div class="d-none name"><code>read_nanoarrow.Rd</code></div>
</div>
<div class="ref-description section level2">
<p>Reads connections, file paths, URLs, or raw vectors of serialized Arrow
data. Arrow documentation typically refers to this format as "Arrow IPC",
since its origin was as a means to transmit tables between processes
(e.g., multiple R sessions). This format can also be written to and read
from files or URLs and is essentially a high performance equivalent of
a CSV file that does a better job maintaining types.</p>
</div>
<div class="section level2">
<h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
<div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">read_nanoarrow</span><span class="op">(</span><span class="va">x</span>, <span class="va">...</span>, lazy <span class="op">=</span> <span class="cn">FALSE</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">example_ipc_stream</span><span class="op">(</span><span class="op">)</span></span></code></pre></div>
</div>
<div class="section level2">
<h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2>
<dl><dt>x</dt>
<dd><p>A <code><a href="https://rdrr.io/r/base/raw.html" class="external-link">raw()</a></code> vector, connection, or file path from which to read
binary data. Common extensions indicating compression (.gz, .bz2, .zip)
are automatically uncompressed.</p></dd>
<dt>...</dt>
<dd><p>Currently unused.</p></dd>
<dt>lazy</dt>
<dd><p>By default, <code>read_nanoarrow()</code> will read and discard a copy of
the reader's schema to ensure that invalid streams are discovered as
soon as possible. Use <code>lazy = TRUE</code> to defer this check until the reader
is actually consumed.</p></dd>
</dl></div>
<div class="section level2">
<h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
<p>A <a href="as_nanoarrow_array_stream.html">nanoarrow_array_stream</a></p>
</div>
<div class="section level2">
<h2 id="details">Details<a class="anchor" aria-label="anchor" href="#details"></a></h2>
<p>The nanoarrow package does not currently have the ability to write serialized
IPC data: use <code><a href="https://arrow.apache.org/docs/r/reference/write_ipc_stream.html" class="external-link">arrow::write_ipc_stream()</a></code> to write data from R, or use
the equivalent writer from another Arrow implementation in Python, C++,
Rust, JavaScript, Julia, C#, and beyond.</p>
<p>The media type of an Arrow stream is <code>application/vnd.apache.arrow.stream</code>
and the recommended file extension is <code>.arrows</code>.</p>
</div>
<div class="section level2">
<h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
<div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/as.data.frame.html" class="external-link">as.data.frame</a></span><span class="op">(</span><span class="fu">read_nanoarrow</span><span class="op">(</span><span class="fu">example_ipc_stream</span><span class="op">(</span><span class="op">)</span><span class="op">)</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> some_col</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 1 1</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 2 2</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 3 3</span>
<span class="r-in"><span></span></span>
</code></pre></div>
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