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<img src="" class="logo" alt=""><h1>Convert an object to a nanoarrow schema</h1>
<small class="dont-index">Source: <a href="https://github.com/apache/arrow-nanoarrow/blob/main/r/R/schema.R" class="external-link"><code>R/schema.R</code></a></small>
<div class="d-none name"><code>as_nanoarrow_schema.Rd</code></div>
</div>
<div class="ref-description section level2">
<p>In nanoarrow a 'schema' refers to a <code>struct ArrowSchema</code> as defined in the
Arrow C Data interface. This data structure can be used to represent an
<code><a href="https://arrow.apache.org/docs/r/reference/schema.html" class="external-link">arrow::schema()</a></code>, an <code><a href="https://arrow.apache.org/docs/r/reference/Field-class.html" class="external-link">arrow::field()</a></code>, or an <code><a href="https://arrow.apache.org/docs/r/reference/DataType-class.html" class="external-link">arrow::DataType</a></code>. Note that
in nanoarrow, an <code><a href="https://arrow.apache.org/docs/r/reference/schema.html" class="external-link">arrow::schema()</a></code> and a non-nullable <code><a href="https://arrow.apache.org/docs/r/reference/data-type.html" class="external-link">arrow::struct()</a></code>
are represented identically.</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">as_nanoarrow_schema</span><span class="op">(</span><span class="va">x</span>, <span class="va">...</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">infer_nanoarrow_schema</span><span class="op">(</span><span class="va">x</span>, <span class="va">...</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">nanoarrow_schema_parse</span><span class="op">(</span><span class="va">x</span>, recursive <span class="op">=</span> <span class="cn">FALSE</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">nanoarrow_schema_modify</span><span class="op">(</span><span class="va">x</span>, <span class="va">new_values</span>, validate <span class="op">=</span> <span class="cn">TRUE</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>An object to convert to a schema</p></dd>
<dt>...</dt>
<dd><p>Passed to S3 methods</p></dd>
<dt>recursive</dt>
<dd><p>Use <code>TRUE</code> to include a <code>children</code> member when parsing
schemas.</p></dd>
<dt>new_values</dt>
<dd><p>New schema component to assign</p></dd>
<dt>validate</dt>
<dd><p>Use <code>FALSE</code> to skip schema validation</p></dd>
</dl></div>
<div class="section level2">
<h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
<p>An object of class 'nanoarrow_schema'</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">infer_nanoarrow_schema</span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/integer.html" class="external-link">integer</a></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> &lt;nanoarrow_schema int32&gt;</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $ format : chr "i"</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $ name : chr ""</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $ metadata : list()</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $ flags : int 2</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $ children : list()</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $ dictionary: NULL</span>
<span class="r-in"><span><span class="fu">infer_nanoarrow_schema</span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame</a></span><span class="op">(</span>x <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/integer.html" class="external-link">integer</a></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> &lt;nanoarrow_schema struct&gt;</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $ format : chr "+s"</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $ name : chr ""</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $ metadata : list()</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $ flags : int 0</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $ children :List of 1</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> ..$ x:&lt;nanoarrow_schema int32&gt;</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> .. ..$ format : chr "i"</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> .. ..$ name : chr "x"</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> .. ..$ metadata : list()</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> .. ..$ flags : int 2</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> .. ..$ children : list()</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> .. ..$ dictionary: NULL</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $ dictionary: NULL</span>
<span class="r-in"><span></span></span>
</code></pre></div>
</div>
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