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| <div class="section" id="pyarrow-dataset-directorypartitioning"> |
| <h1>pyarrow.dataset.DirectoryPartitioning<a class="headerlink" href="#pyarrow-dataset-directorypartitioning" title="Permalink to this headline">¶</a></h1> |
| <dl class="py class"> |
| <dt id="pyarrow.dataset.DirectoryPartitioning"> |
| <em class="property">class </em><code class="sig-prename descclassname">pyarrow.dataset.</code><code class="sig-name descname">DirectoryPartitioning</code><a class="headerlink" href="#pyarrow.dataset.DirectoryPartitioning" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">pyarrow._dataset.Partitioning</span></code></p> |
| <p>A Partitioning based on a specified Schema.</p> |
| <p>The DirectoryPartitioning expects one segment in the file path for each |
| field in the schema (all fields are required to be present). |
| For example given schema<year:int16, month:int8> the path “/2009/11” would |
| be parsed to (“year”_ == 2009 and “month”_ == 11).</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><p><strong>schema</strong> (<a class="reference internal" href="pyarrow.Schema.html#pyarrow.Schema" title="pyarrow.Schema"><em>Schema</em></a>) – The schema that describes the partitions present in the file path.</p> |
| </dd> |
| <dt class="field-even">Returns</dt> |
| <dd class="field-even"><p><em>DirectoryPartitioning</em></p> |
| </dd> |
| </dl> |
| <p class="rubric">Examples</p> |
| <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">pyarrow.dataset</span> <span class="k">import</span> <span class="n">DirectoryPartitioning</span> |
| <span class="gp">>>> </span><span class="n">partition</span> <span class="o">=</span> <span class="n">DirectoryPartitioning</span><span class="p">(</span> |
| <span class="gp">... </span> <span class="n">pa</span><span class="o">.</span><span class="n">schema</span><span class="p">([(</span><span class="s2">"year"</span><span class="p">,</span> <span class="n">pa</span><span class="o">.</span><span class="n">int16</span><span class="p">()),</span> <span class="p">(</span><span class="s2">"month"</span><span class="p">,</span> <span class="n">pa</span><span class="o">.</span><span class="n">int8</span><span class="p">())]))</span> |
| <span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="n">partitioning</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="s2">"/2009/11"</span><span class="p">))</span> |
| <span class="go">((year == 2009:int16) and (month == 11:int8))</span> |
| </pre></div> |
| </div> |
| <dl class="py method"> |
| <dt id="pyarrow.dataset.DirectoryPartitioning.__init__"> |
| <code class="sig-name descname">__init__</code><span class="sig-paren">(</span><em class="sig-param"><span class="o">*</span><span class="n">args</span></em>, <em class="sig-param"><span class="o">**</span><span class="n">kwargs</span></em><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.dataset.DirectoryPartitioning.__init__" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Initialize self. See help(type(self)) for accurate signature.</p> |
| </dd></dl> |
| |
| <p class="rubric">Methods</p> |
| <table class="longtable docutils align-default"> |
| <colgroup> |
| <col style="width: 10%" /> |
| <col style="width: 90%" /> |
| </colgroup> |
| <tbody> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.dataset.DirectoryPartitioning.__init__" title="pyarrow.dataset.DirectoryPartitioning.__init__"><code class="xref py py-obj docutils literal notranslate"><span class="pre">__init__</span></code></a>(*args, **kwargs)</p></td> |
| <td><p>Initialize self.</p></td> |
| </tr> |
| <tr class="row-even"><td><p><a class="reference internal" href="#pyarrow.dataset.DirectoryPartitioning.discover" title="pyarrow.dataset.DirectoryPartitioning.discover"><code class="xref py py-obj docutils literal notranslate"><span class="pre">discover</span></code></a></p></td> |
| <td><p>Discover a DirectoryPartitioning.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.dataset.DirectoryPartitioning.parse" title="pyarrow.dataset.DirectoryPartitioning.parse"><code class="xref py py-obj docutils literal notranslate"><span class="pre">parse</span></code></a></p></td> |
| <td><p></p></td> |
| </tr> |
| </tbody> |
| </table> |
| <p class="rubric">Attributes</p> |
| <table class="longtable docutils align-default"> |
| <colgroup> |
| <col style="width: 10%" /> |
| <col style="width: 90%" /> |
| </colgroup> |
| <tbody> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.dataset.DirectoryPartitioning.schema" title="pyarrow.dataset.DirectoryPartitioning.schema"><code class="xref py py-obj docutils literal notranslate"><span class="pre">schema</span></code></a></p></td> |
| <td><p>The arrow Schema attached to the partitioning.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <dl class="py method"> |
| <dt id="pyarrow.dataset.DirectoryPartitioning.discover"> |
| <em class="property">static </em><code class="sig-name descname">discover</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.dataset.DirectoryPartitioning.discover" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Discover a DirectoryPartitioning.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>field_names</strong> (<em>list of str</em>) – The names to associate with the values from the subdirectory names.</p></li> |
| <li><p><strong>infer_dictionary</strong> (<em>bool</em><em>, </em><em>default False</em>) – When inferring a schema for partition fields, yield dictionary |
| encoded types instead of plain types. This can be more efficient |
| when materializing virtual columns, and Expressions parsed by the |
| finished Partitioning will include dictionaries of all unique |
| inspected values for each field.</p></li> |
| <li><p><strong>max_partition_dictionary_size</strong> (<em>int</em><em>, </em><em>default 0</em>) – Synonymous with infer_dictionary for backwards compatibility with |
| 1.0: setting this to -1 or None is equivalent to passing |
| infer_dictionary=True.</p></li> |
| </ul> |
| </dd> |
| <dt class="field-even">Returns</dt> |
| <dd class="field-even"><p><em>DirectoryPartitioningFactory</em> – To be used in the FileSystemFactoryOptions.</p> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt id="pyarrow.dataset.DirectoryPartitioning.parse"> |
| <code class="sig-name descname">parse</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.dataset.DirectoryPartitioning.parse" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="py attribute"> |
| <dt id="pyarrow.dataset.DirectoryPartitioning.schema"> |
| <code class="sig-name descname">schema</code><a class="headerlink" href="#pyarrow.dataset.DirectoryPartitioning.schema" title="Permalink to this definition">¶</a></dt> |
| <dd><p>The arrow Schema attached to the partitioning.</p> |
| </dd></dl> |
| |
| </dd></dl> |
| |
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