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| <img src="" class="logo" alt=""><h1>CSV dataset file format</h1> |
| <small class="dont-index">Source: <a href="https://github.com/apache/arrow/blob/main/r/R/dataset-format.R" class="external-link"><code>R/dataset-format.R</code></a></small> |
| <div class="d-none name"><code>CsvFileFormat.Rd</code></div> |
| </div> |
| |
| <div class="ref-description section level2"> |
| <p>A <code>CSVFileFormat</code> is a <a href="FileFormat.html">FileFormat</a> subclass which holds information about how to |
| read and parse the files included in a CSV <code>Dataset</code>.</p> |
| </div> |
| |
| |
| <div class="section level2"> |
| <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2> |
| |
| |
| <p>A <code>CsvFileFormat</code> object</p> |
| </div> |
| <div class="section level2"> |
| <h2 id="factory">Factory<a class="anchor" aria-label="anchor" href="#factory"></a></h2> |
| |
| |
| <p><code>CSVFileFormat$create()</code> can take options in the form of lists passed through as <code>parse_options</code>, |
| <code>read_options</code>, or <code>convert_options</code> parameters. Alternatively, readr-style options can be passed |
| through individually. While it is possible to pass in <code>CSVReadOptions</code>, <code>CSVConvertOptions</code>, and <code>CSVParseOptions</code> |
| objects, this is not recommended as options set in these objects are not validated for compatibility.</p> |
| </div> |
| <div class="section level2"> |
| <h2 id="see-also">See also<a class="anchor" aria-label="anchor" href="#see-also"></a></h2> |
| <div class="dont-index"><p><a href="FileFormat.html">FileFormat</a></p></div> |
| </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="co"># Set up directory for examples</span></span></span> |
| <span class="r-in"><span><span class="va">tf</span> <span class="op"><-</span> <span class="fu"><a href="https://rdrr.io/r/base/tempfile.html" class="external-link">tempfile</a></span><span class="op">(</span><span class="op">)</span></span></span> |
| <span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/files2.html" class="external-link">dir.create</a></span><span class="op">(</span><span class="va">tf</span><span class="op">)</span></span></span> |
| <span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/on.exit.html" class="external-link">on.exit</a></span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/unlink.html" class="external-link">unlink</a></span><span class="op">(</span><span class="va">tf</span><span class="op">)</span><span class="op">)</span></span></span> |
| <span class="r-in"><span><span class="va">df</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/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"1"</span>, <span class="st">"2"</span>, <span class="st">"NULL"</span><span class="op">)</span><span class="op">)</span></span></span> |
| <span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/utils/write.table.html" class="external-link">write.table</a></span><span class="op">(</span><span class="va">df</span>, <span class="fu"><a href="https://rdrr.io/r/base/file.path.html" class="external-link">file.path</a></span><span class="op">(</span><span class="va">tf</span>, <span class="st">"file1.txt"</span><span class="op">)</span>, sep <span class="op">=</span> <span class="st">","</span>, row.names <span class="op">=</span> <span class="cn">FALSE</span><span class="op">)</span></span></span> |
| <span class="r-in"><span></span></span> |
| <span class="r-in"><span><span class="co"># Create CsvFileFormat object with Arrow-style null_values option</span></span></span> |
| <span class="r-in"><span><span class="va">format</span> <span class="op"><-</span> <span class="va">CsvFileFormat</span><span class="op">$</span><span class="fu">create</span><span class="op">(</span>convert_options <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/list.html" class="external-link">list</a></span><span class="op">(</span>null_values <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">""</span>, <span class="st">"NA"</span>, <span class="st">"NULL"</span><span class="op">)</span><span class="op">)</span><span class="op">)</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="va">tf</span>, format <span class="op">=</span> <span class="va">format</span><span class="op">)</span></span></span> |
| <span class="r-out co"><span class="r-pr">#></span> FileSystemDataset with 1 csv file</span> |
| <span class="r-out co"><span class="r-pr">#></span> 1 columns</span> |
| <span class="r-out co"><span class="r-pr">#></span> x: int64</span> |
| <span class="r-in"><span></span></span> |
| <span class="r-in"><span><span class="co"># Use readr-style options</span></span></span> |
| <span class="r-in"><span><span class="va">format</span> <span class="op"><-</span> <span class="va">CsvFileFormat</span><span class="op">$</span><span class="fu">create</span><span class="op">(</span>na <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">""</span>, <span class="st">"NA"</span>, <span class="st">"NULL"</span><span class="op">)</span><span class="op">)</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="va">tf</span>, format <span class="op">=</span> <span class="va">format</span><span class="op">)</span></span></span> |
| <span class="r-out co"><span class="r-pr">#></span> FileSystemDataset with 1 csv file</span> |
| <span class="r-out co"><span class="r-pr">#></span> 1 columns</span> |
| <span class="r-out co"><span class="r-pr">#></span> x: int64</span> |
| </code></pre></div> |
| </div> |
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