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 <meta property="og:title" content="Create a Source for a Dataset — open_source" />
 <meta property="og:description" content="A Dataset can have one or more Sources. A Source contains one or more
 Fragments, such as files, of a common storage location, format, and
 partitioning. This function helps you construct a Source that you can
 pass to open_dataset()." />
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 <div class="row">
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     <div class="page-header">
     <h1>Create a Source for a Dataset</h1>
     <small class="dont-index">Source: <a href='https://github.com/apache/arrow/blob/master/R/dataset.R'><code>R/dataset.R</code></a></small>
     <div class="hidden name"><code>open_source.Rd</code></div>
     </div>

     <div class="ref-description">
     <p>A <a href='Dataset.html'>Dataset</a> can have one or more <a href='Source.html'>Source</a>s. A <code>Source</code> contains one or more
 <code>Fragments</code>, such as files, of a common storage location, format, and
 partitioning. This function helps you construct a <code>Source</code> that you can
 pass to <code><a href='open_dataset.html'>open_dataset()</a></code>.</p>
     </div>

     <pre class="usage"><span class='fu'>open_source</span>(
   <span class='no'>path</span>,
   <span class='kw'>filesystem</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='st'>"auto"</span>, <span class='st'>"local"</span>),
   <span class='kw'>format</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='st'>"parquet"</span>, <span class='st'>"arrow"</span>, <span class='st'>"ipc"</span>),
   <span class='kw'>partitioning</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
   <span class='kw'>allow_non_existent</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>,
   <span class='kw'>recursive</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>,
   <span class='no'>...</span>
 )</pre>

     <h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
     <table class="ref-arguments">
     <colgroup><col class="name" /><col class="desc" /></colgroup>
     <tr>
       <th>path</th>
       <td><p>A string file path containing data files</p></td>
     </tr>
     <tr>
       <th>filesystem</th>
       <td><p>A string identifier for the filesystem corresponding to
 <code>path</code>. Currently only "local" is supported.</p></td>
     </tr>
     <tr>
       <th>format</th>
       <td><p>A string identifier of the format of the files in <code>path</code>.
 Currently supported options are "parquet", "arrow", and "ipc" (an alias for
 the Arrow file format)</p></td>
     </tr>
     <tr>
       <th>partitioning</th>
       <td><p>One of</p><ul>
 <li><p>A <code>Schema</code>, in which case the file paths relative to <code>sources</code> will be
 parsed, and path segments will be matched with the schema fields. For
 example, <code><a href='Schema.html'>schema(year = int16(), month = int8())</a></code> would create partitions
 for file paths like "2019/01/file.parquet", "2019/02/file.parquet", etc.</p></li>
 <li><p>A character vector that defines the field names corresponding to those
 path segments (that is, you're providing the names that would correspond
 to a <code>Schema</code> but the types will be autodetected)</p></li>
 <li><p>A <code>HivePartitioning</code> or <code>HivePartitioningFactory</code>, as returned
 by <code><a href='hive_partition.html'>hive_partition()</a></code> which parses explicit or autodetected fields from
 Hive-style path segments</p></li>
 <li><p><code>NULL</code> for no partitioning</p></li>
 </ul></td>
     </tr>
     <tr>
       <th>allow_non_existent</th>
       <td><p>logical: is <code>path</code> allowed to not exist? Default
 <code>FALSE</code>. See <a href='FileSelector.html'>FileSelector</a>.</p></td>
     </tr>
     <tr>
       <th>recursive</th>
       <td><p>logical: should files be discovered in subdirectories of
 <code>path</code>? Default <code>TRUE</code>.</p></td>
     </tr>
     <tr>
       <th>...</th>
       <td><p>Additional arguments passed to the <a href='FileSystem.html'>FileSystem</a> <code>$create()</code> method</p></td>
     </tr>
     </table>

     <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>

     <p>A <code>SourceFactory</code> object. Pass this to <code><a href='open_dataset.html'>open_dataset()</a></code>,
 in a list potentially with other <code>SourceFactory</code> objects, to create
 a <code>Dataset</code>.</p>
     <h2 class="hasAnchor" id="details"><a class="anchor" href="#details"></a>Details</h2>

     <p>If you only have a single <code>Source</code>, such as a directory containing Parquet
 files, you can call <code><a href='open_dataset.html'>open_dataset()</a></code> directly. Use <code>open_source()</code> when you
 want to combine different directories, file systems, or file formats.</p>

   </div>
   <div class="col-md-3 hidden-xs hidden-sm" id="sidebar">
     <h2>Contents</h2>
     <ul class="nav nav-pills nav-stacked">
       <li><a href="#arguments">Arguments</a></li>
       <li><a href="#value">Value</a></li>
       <li><a href="#details">Details</a></li>
     </ul>

   </div>
 </div>


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	Fragments, such as files, of a common storage location, format, and
	partitioning. This function helps you construct a Source that you can
	pass to open_dataset()." />
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	</header>

	<div class="row">
	<div class="col-md-9 contents">
	<div class="page-header">
	<h1>Create a Source for a Dataset</h1>
	<small class="dont-index">Source: <a href='https://github.com/apache/arrow/blob/master/R/dataset.R'><code>R/dataset.R</code></a></small>
	<div class="hidden name"><code>open_source.Rd</code></div>
	</div>

	<div class="ref-description">
	<p>A <a href='Dataset.html'>Dataset</a> can have one or more <a href='Source.html'>Source</a>s. A <code>Source</code> contains one or more
	<code>Fragments</code>, such as files, of a common storage location, format, and
	partitioning. This function helps you construct a <code>Source</code> that you can
	pass to <code><a href='open_dataset.html'>open_dataset()</a></code>.</p>
	</div>

	<pre class="usage"><span class='fu'>open_source</span>(
	<span class='no'>path</span>,
	<span class='kw'>filesystem</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='st'>"auto"</span>, <span class='st'>"local"</span>),
	<span class='kw'>format</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='st'>"parquet"</span>, <span class='st'>"arrow"</span>, <span class='st'>"ipc"</span>),
	<span class='kw'>partitioning</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
	<span class='kw'>allow_non_existent</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>,
	<span class='kw'>recursive</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>,
	<span class='no'>...</span>
	)</pre>

	<h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
	<table class="ref-arguments">
	<colgroup><col class="name" /><col class="desc" /></colgroup>
	<tr>
	<th>path</th>
	<td><p>A string file path containing data files</p></td>
	</tr>
	<tr>
	<th>filesystem</th>
	<td><p>A string identifier for the filesystem corresponding to
	<code>path</code>. Currently only "local" is supported.</p></td>
	</tr>
	<tr>
	<th>format</th>
	<td><p>A string identifier of the format of the files in <code>path</code>.
	Currently supported options are "parquet", "arrow", and "ipc" (an alias for
	the Arrow file format)</p></td>
	</tr>
	<tr>
	<th>partitioning</th>
	<td><p>One of</p><ul>
	<li><p>A <code>Schema</code>, in which case the file paths relative to <code>sources</code> will be
	parsed, and path segments will be matched with the schema fields. For
	example, <code><a href='Schema.html'>schema(year = int16(), month = int8())</a></code> would create partitions
	for file paths like "2019/01/file.parquet", "2019/02/file.parquet", etc.</p></li>
	<li><p>A character vector that defines the field names corresponding to those
	path segments (that is, you're providing the names that would correspond
	to a <code>Schema</code> but the types will be autodetected)</p></li>
	<li><p>A <code>HivePartitioning</code> or <code>HivePartitioningFactory</code>, as returned
	by <code><a href='hive_partition.html'>hive_partition()</a></code> which parses explicit or autodetected fields from
	Hive-style path segments</p></li>
	<li><p><code>NULL</code> for no partitioning</p></li>
	</ul></td>
	</tr>
	<tr>
	<th>allow_non_existent</th>
	<td><p>logical: is <code>path</code> allowed to not exist? Default
	<code>FALSE</code>. See <a href='FileSelector.html'>FileSelector</a>.</p></td>
	</tr>
	<tr>
	<th>recursive</th>
	<td><p>logical: should files be discovered in subdirectories of
	<code>path</code>? Default <code>TRUE</code>.</p></td>
	</tr>
	<tr>
	<th>...</th>
	<td><p>Additional arguments passed to the <a href='FileSystem.html'>FileSystem</a> <code>$create()</code> method</p></td>
	</tr>
	</table>

	<h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>

	<p>A <code>SourceFactory</code> object. Pass this to <code><a href='open_dataset.html'>open_dataset()</a></code>,
	in a list potentially with other <code>SourceFactory</code> objects, to create
	a <code>Dataset</code>.</p>
	<h2 class="hasAnchor" id="details"><a class="anchor" href="#details"></a>Details</h2>

	<p>If you only have a single <code>Source</code>, such as a directory containing Parquet
	files, you can call <code><a href='open_dataset.html'>open_dataset()</a></code> directly. Use <code>open_source()</code> when you
	want to combine different directories, file systems, or file formats.</p>

	</div>
	<div class="col-md-3 hidden-xs hidden-sm" id="sidebar">
	<h2>Contents</h2>
	<ul class="nav nav-pills nav-stacked">
	<li><a href="#arguments">Arguments</a></li>
	<li><a href="#value">Value</a></li>
	<li><a href="#details">Details</a></li>
	</ul>

	</div>
	</div>


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