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| <h1>Add the data filename as a column</h1> |
| <small class="dont-index">Source: <a href="https://github.com/apache/arrow/blob/main/r/R/dplyr-funcs-augmented.R" class="external-link"><code>R/dplyr-funcs-augmented.R</code></a></small> |
| <div class="d-none name"><code>add_filename.Rd</code></div> |
| </div> |
| |
| <div class="ref-description section level2"> |
| <p>This function only exists inside <code>arrow</code> <code>dplyr</code> queries, and it only is |
| valid when querying on a <code>FileSystemDataset</code>.</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">add_filename</span><span class="op">(</span><span class="op">)</span></span></code></pre></div> |
| </div> |
| |
| <div class="section level2"> |
| <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2> |
| <p>A <code>FieldRef</code> <code><a href="Expression.html">Expression</a></code> that refers to the filename |
| augmented column.</p> |
| </div> |
| <div class="section level2"> |
| <h2 id="details">Details<a class="anchor" aria-label="anchor" href="#details"></a></h2> |
| <p>To use filenames generated by this function in subsequent pipeline steps, you |
| must either call <code><a href="https://dplyr.tidyverse.org/reference/compute.html" class="external-link">compute()</a></code> or |
| <code><a href="https://dplyr.tidyverse.org/reference/compute.html" class="external-link">collect()</a></code> first. See Examples.</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="kw">if</span> <span class="op">(</span><span class="cn">FALSE</span><span class="op">)</span> <span class="op">{</span> <span class="co"># \dontrun{</span></span></span> |
| <span class="r-in"><span><span class="fu"><a href="open_dataset.html">open_dataset</a></span><span class="op">(</span><span class="st">"nyc-taxi"</span><span class="op">)</span> <span class="op">|></span> <span class="fu">mutate</span><span class="op">(</span></span></span> |
| <span class="r-in"><span> file <span class="op">=</span></span></span> |
| <span class="r-in"><span> <span class="fu">add_filename</span><span class="op">(</span><span class="op">)</span></span></span> |
| <span class="r-in"><span><span class="op">)</span></span></span> |
| <span class="r-in"><span></span></span> |
| <span class="r-in"><span><span class="co"># To use a verb like mutate() with add_filename() we need to first call</span></span></span> |
| <span class="r-in"><span><span class="co"># compute()</span></span></span> |
| <span class="r-in"><span><span class="fu"><a href="open_dataset.html">open_dataset</a></span><span class="op">(</span><span class="st">"nyc-taxi"</span><span class="op">)</span> <span class="op">|></span></span></span> |
| <span class="r-in"><span> <span class="fu">mutate</span><span class="op">(</span>file <span class="op">=</span> <span class="fu">add_filename</span><span class="op">(</span><span class="op">)</span><span class="op">)</span> <span class="op">|></span></span></span> |
| <span class="r-in"><span> <span class="fu">compute</span><span class="op">(</span><span class="op">)</span> <span class="op">|></span></span></span> |
| <span class="r-in"><span> <span class="fu">mutate</span><span class="op">(</span>filename_length <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/nchar.html" class="external-link">nchar</a></span><span class="op">(</span><span class="va">file</span><span class="op">)</span><span class="op">)</span></span></span> |
| <span class="r-in"><span><span class="op">}</span> <span class="co"># }</span></span></span> |
| <span class="r-in"><span></span></span> |
| </code></pre></div> |
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