main/r/reference/read_nanoarrow.html - arrow-nanoarrow - Git at Google

 <!DOCTYPE html>
 <!-- Generated by pkgdown: do not edit by hand --><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><title>Read serialized streams of Arrow data — read_nanoarrow • nanoarrow</title><script src="../deps/jquery-3.6.0/jquery-3.6.0.min.js"></script><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><link href="../deps/bootstrap-5.3.1/bootstrap.min.css" rel="stylesheet"><script src="../deps/bootstrap-5.3.1/bootstrap.bundle.min.js"></script><link href="../deps/font-awesome-6.4.2/css/all.min.css" rel="stylesheet"><link href="../deps/font-awesome-6.4.2/css/v4-shims.min.css" rel="stylesheet"><script src="../deps/headroom-0.11.0/headroom.min.js"></script><script src="../deps/headroom-0.11.0/jQuery.headroom.min.js"></script><script src="../deps/bootstrap-toc-1.0.1/bootstrap-toc.min.js"></script><script src="../deps/clipboard.js-2.0.11/clipboard.min.js"></script><script src="../deps/search-1.0.0/autocomplete.jquery.min.js"></script><script src="../deps/search-1.0.0/fuse.min.js"></script><script src="../deps/search-1.0.0/mark.min.js"></script><!-- pkgdown --><script src="../pkgdown.js"></script><meta property="og:title" content="Read serialized streams of Arrow data — read_nanoarrow"><meta name="description" content='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.'><meta property="og:description" content='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.'></head><body>
     <a href="#main" class="visually-hidden-focusable">Skip to contents</a>


     <nav class="navbar navbar-expand-lg fixed-top bg-light" data-bs-theme="light" aria-label="Site navigation"><div class="container">

     <a class="navbar-brand me-2" href="../index.html">nanoarrow</a>

     <small class="nav-text text-muted me-auto" data-bs-toggle="tooltip" data-bs-placement="bottom" title="">0.5.0.9000</small>


     <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbar" aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation">
       <span class="navbar-toggler-icon"></span>
     </button>

     <div id="navbar" class="collapse navbar-collapse ms-3">
       <ul class="navbar-nav me-auto"><li class="active nav-item"><a class="nav-link" href="../reference/index.html">Reference</a></li>
 <li class="nav-item"><a class="nav-link" href="../news/index.html">Changelog</a></li>
       </ul><ul class="navbar-nav"><li class="nav-item"><form class="form-inline" role="search">
  <input class="form-control" type="search" name="search-input" id="search-input" autocomplete="off" aria-label="Search site" placeholder="Search for" data-search-index="../search.json"></form></li>
 <li class="nav-item"><a class="external-link nav-link" href="https://github.com/apache/arrow-nanoarrow/" aria-label="GitHub"><span class="fa fab fa-github fa-lg"></span></a></li>
       </ul></div>


   </div>
 </nav><div class="container template-reference-topic">
 <div class="row">
   <main id="main" class="col-md-9"><div class="page-header">

       <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 id="arg-x">x<a class="anchor" aria-label="anchor" href="#arg-x"></a></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 id="arg--">...<a class="anchor" aria-label="anchor" href="#arg--"></a></dt>
 <dd><p>Currently unused.</p></dd>


 <dt id="arg-lazy">lazy<a class="anchor" aria-label="anchor" href="#arg-lazy"></a></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>
     </div>
   </main><aside class="col-md-3"><nav id="toc" aria-label="Table of contents"><h2>On this page</h2>
     </nav></aside></div>


     <footer><div class="pkgdown-footer-left">
   <p>Developed by Dewey Dunnington, Apache Arrow.</p>
 </div>

 <div class="pkgdown-footer-right">
   <p>Site built with <a href="https://pkgdown.r-lib.org/" class="external-link">pkgdown</a> 2.1.0.</p>
 </div>

     </footer></div>


   </body></html>
	<!DOCTYPE html>
	<!-- Generated by pkgdown: do not edit by hand --><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><title>Read serialized streams of Arrow data — read_nanoarrow • nanoarrow</title><script src="../deps/jquery-3.6.0/jquery-3.6.0.min.js"></script><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><link href="../deps/bootstrap-5.3.1/bootstrap.min.css" rel="stylesheet"><script src="../deps/bootstrap-5.3.1/bootstrap.bundle.min.js"></script><link href="../deps/font-awesome-6.4.2/css/all.min.css" rel="stylesheet"><link href="../deps/font-awesome-6.4.2/css/v4-shims.min.css" rel="stylesheet"><script src="../deps/headroom-0.11.0/headroom.min.js"></script><script src="../deps/headroom-0.11.0/jQuery.headroom.min.js"></script><script src="../deps/bootstrap-toc-1.0.1/bootstrap-toc.min.js"></script><script src="../deps/clipboard.js-2.0.11/clipboard.min.js"></script><script src="../deps/search-1.0.0/autocomplete.jquery.min.js"></script><script src="../deps/search-1.0.0/fuse.min.js"></script><script src="../deps/search-1.0.0/mark.min.js"></script><!-- pkgdown --><script src="../pkgdown.js"></script><meta property="og:title" content="Read serialized streams of Arrow data — read_nanoarrow"><meta name="description" content='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.'><meta property="og:description" content='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.'></head><body>
	<a href="#main" class="visually-hidden-focusable">Skip to contents</a>


	<nav class="navbar navbar-expand-lg fixed-top bg-light" data-bs-theme="light" aria-label="Site navigation"><div class="container">

	<a class="navbar-brand me-2" href="../index.html">nanoarrow</a>

	<small class="nav-text text-muted me-auto" data-bs-toggle="tooltip" data-bs-placement="bottom" title="">0.5.0.9000</small>


	<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbar" aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation">
	<span class="navbar-toggler-icon"></span>
	</button>

	<div id="navbar" class="collapse navbar-collapse ms-3">
	<ul class="navbar-nav me-auto"><li class="active nav-item"><a class="nav-link" href="../reference/index.html">Reference</a></li>
	<li class="nav-item"><a class="nav-link" href="../news/index.html">Changelog</a></li>
	</ul><ul class="navbar-nav"><li class="nav-item"><form class="form-inline" role="search">
	<input class="form-control" type="search" name="search-input" id="search-input" autocomplete="off" aria-label="Search site" placeholder="Search for" data-search-index="../search.json"></form></li>
	<li class="nav-item"><a class="external-link nav-link" href="https://github.com/apache/arrow-nanoarrow/" aria-label="GitHub"><span class="fa fab fa-github fa-lg"></span></a></li>
	</ul></div>


	</div>
	</nav><div class="container template-reference-topic">
	<div class="row">
	<main id="main" class="col-md-9"><div class="page-header">

	<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 id="arg-x">x<a class="anchor" aria-label="anchor" href="#arg-x"></a></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 id="arg--">...<a class="anchor" aria-label="anchor" href="#arg--"></a></dt>
	<dd><p>Currently unused.</p></dd>


	<dt id="arg-lazy">lazy<a class="anchor" aria-label="anchor" href="#arg-lazy"></a></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">#></span> some_col</span>
	<span class="r-out co"><span class="r-pr">#></span> 1 1</span>
	<span class="r-out co"><span class="r-pr">#></span> 2 2</span>
	<span class="r-out co"><span class="r-pr">#></span> 3 3</span>
	<span class="r-in"><span></span></span>
	</code></pre></div>
	</div>
	</main><aside class="col-md-3"><nav id="toc" aria-label="Table of contents"><h2>On this page</h2>
	</nav></aside></div>


	<footer><div class="pkgdown-footer-left">
	<p>Developed by Dewey Dunnington, Apache Arrow.</p>
	</div>

	<div class="pkgdown-footer-right">
	<p>Site built with <a href="https://pkgdown.r-lib.org/" class="external-link">pkgdown</a> 2.1.0.</p>
	</div>

	</footer></div>





	</body></html>