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| <section id="pyarrow-dataset-filenamepartitioning"> |
| <h1>pyarrow.dataset.FilenamePartitioning<a class="headerlink" href="#pyarrow-dataset-filenamepartitioning" title="Permalink to this heading">#</a></h1> |
| <dl class="py class"> |
| <dt class="sig sig-object py" id="pyarrow.dataset.FilenamePartitioning"> |
| <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">pyarrow.dataset.</span></span><span class="sig-name descname"><span class="pre">FilenamePartitioning</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">Schema</span> <span class="pre">schema</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">dictionaries=None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">segment_encoding=u'uri'</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.dataset.FilenamePartitioning" title="Permalink to this definition">#</a></dt> |
| <dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">KeyValuePartitioning</span></code></p> |
| <p>A Partitioning based on a specified Schema.</p> |
| <p>The FilenamePartitioning expects one segment in the file name for each |
| field in the schema (all fields are required to be present) separated |
| by ‘_’. For example given schema<year:int16, month:int8> the name |
| <code class="docutils literal notranslate"><span class="pre">"2009_11_"</span></code> would be parsed to (“year” == 2009 and “month” == 11).</p> |
| <dl class="field-list"> |
| <dt class="field-odd">Parameters<span class="colon">:</span></dt> |
| <dd class="field-odd"><dl> |
| <dt><strong>schema</strong><span class="classifier"><a class="reference internal" href="pyarrow.Schema.html#pyarrow.Schema" title="pyarrow.Schema"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Schema</span></code></a></span></dt><dd><p>The schema that describes the partitions present in the file path.</p> |
| </dd> |
| <dt><strong>dictionaries</strong><span class="classifier"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#dict" title="(in Python v3.12)"><code class="docutils literal notranslate"><span class="pre">dict</span></code></a>[<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.12)"><code class="docutils literal notranslate"><span class="pre">str</span></code></a>, <a class="reference internal" href="pyarrow.Array.html#pyarrow.Array" title="pyarrow.Array"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Array</span></code></a>]</span></dt><dd><p>If the type of any field of <cite>schema</cite> is a dictionary type, the |
| corresponding entry of <cite>dictionaries</cite> must be an array containing |
| every value which may be taken by the corresponding column or an |
| error will be raised in parsing.</p> |
| </dd> |
| <dt><strong>segment_encoding</strong><span class="classifier"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.12)"><code class="docutils literal notranslate"><span class="pre">str</span></code></a>, default “uri”</span></dt><dd><p>After splitting paths into segments, decode the segments. Valid |
| values are “uri” (URI-decode segments) and “none” (leave as-is).</p> |
| </dd> |
| </dl> |
| </dd> |
| <dt class="field-even">Returns<span class="colon">:</span></dt> |
| <dd class="field-even"><dl class="simple"> |
| <dt><a class="reference internal" href="#pyarrow.dataset.FilenamePartitioning" title="pyarrow.dataset.FilenamePartitioning"><code class="xref py py-obj docutils literal notranslate"><span class="pre">FilenamePartitioning</span></code></a></dt><dd></dd> |
| </dl> |
| </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="kn">import</span> <span class="n">FilenamePartitioning</span> |
| <span class="gp">>>> </span><span class="n">partitioning</span> <span class="o">=</span> <span class="n">FilenamePartitioning</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_data.parquet"</span><span class="p">))</span> |
| <span class="go">((year == 2009) and (month == 11))</span> |
| </pre></div> |
| </div> |
| <dl class="py method"> |
| <dt class="sig sig-object py" id="pyarrow.dataset.FilenamePartitioning.__init__"> |
| <span class="sig-name descname"><span class="pre">__init__</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="o"><span class="pre">*</span></span><span class="n"><span class="pre">args</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">**</span></span><span class="n"><span class="pre">kwargs</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.dataset.FilenamePartitioning.__init__" title="Permalink to this definition">#</a></dt> |
| <dd></dd></dl> |
| |
| <p class="rubric">Methods</p> |
| <table class="autosummary longtable table autosummary"> |
| <tbody> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.dataset.FilenamePartitioning.__init__" title="pyarrow.dataset.FilenamePartitioning.__init__"><code class="xref py py-obj docutils literal notranslate"><span class="pre">__init__</span></code></a>(*args, **kwargs)</p></td> |
| <td><p></p></td> |
| </tr> |
| <tr class="row-even"><td><p><a class="reference internal" href="#pyarrow.dataset.FilenamePartitioning.discover" title="pyarrow.dataset.FilenamePartitioning.discover"><code class="xref py py-obj docutils literal notranslate"><span class="pre">discover</span></code></a>([field_names, infer_dictionary, ...])</p></td> |
| <td><p>Discover a FilenamePartitioning.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.dataset.FilenamePartitioning.parse" title="pyarrow.dataset.FilenamePartitioning.parse"><code class="xref py py-obj docutils literal notranslate"><span class="pre">parse</span></code></a>(self, path)</p></td> |
| <td><p>Parse a path into a partition expression.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <p class="rubric">Attributes</p> |
| <table class="autosummary longtable table autosummary"> |
| <tbody> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.dataset.FilenamePartitioning.dictionaries" title="pyarrow.dataset.FilenamePartitioning.dictionaries"><code class="xref py py-obj docutils literal notranslate"><span class="pre">dictionaries</span></code></a></p></td> |
| <td><p>The unique values for each partition field, if available.</p></td> |
| </tr> |
| <tr class="row-even"><td><p><a class="reference internal" href="#pyarrow.dataset.FilenamePartitioning.schema" title="pyarrow.dataset.FilenamePartitioning.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 attribute"> |
| <dt class="sig sig-object py" id="pyarrow.dataset.FilenamePartitioning.dictionaries"> |
| <span class="sig-name descname"><span class="pre">dictionaries</span></span><a class="headerlink" href="#pyarrow.dataset.FilenamePartitioning.dictionaries" title="Permalink to this definition">#</a></dt> |
| <dd><p>The unique values for each partition field, if available.</p> |
| <p>Those values are only available if the Partitioning object was |
| created through dataset discovery from a PartitioningFactory, or |
| if the dictionaries were manually specified in the constructor. |
| If no dictionary field is available, this returns an empty list.</p> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt class="sig sig-object py" id="pyarrow.dataset.FilenamePartitioning.discover"> |
| <em class="property"><span class="pre">static</span><span class="w"> </span></em><span class="sig-name descname"><span class="pre">discover</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">field_names</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">infer_dictionary</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">schema</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">segment_encoding</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">'uri'</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.dataset.FilenamePartitioning.discover" title="Permalink to this definition">#</a></dt> |
| <dd><p>Discover a FilenamePartitioning.</p> |
| <dl class="field-list"> |
| <dt class="field-odd">Parameters<span class="colon">:</span></dt> |
| <dd class="field-odd"><dl> |
| <dt><strong>field_names</strong><span class="classifier"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#list" title="(in Python v3.12)"><code class="docutils literal notranslate"><span class="pre">list</span></code></a> of <a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.12)"><code class="docutils literal notranslate"><span class="pre">str</span></code></a></span></dt><dd><p>The names to associate with the values from the subdirectory names. |
| If schema is given, will be populated from the schema.</p> |
| </dd> |
| <dt><strong>infer_dictionary</strong><span class="classifier"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#bltin-boolean-values" title="(in Python v3.12)"><span class="xref std std-ref">bool</span></a>, default <a class="reference external" href="https://docs.python.org/3/library/constants.html#False" title="(in Python v3.12)"><code class="docutils literal notranslate"><span class="pre">False</span></code></a></span></dt><dd><p>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> |
| </dd> |
| <dt><strong>schema</strong><span class="classifier"><a class="reference internal" href="pyarrow.Schema.html#pyarrow.Schema" title="pyarrow.Schema"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Schema</span></code></a>, default <a class="reference external" href="https://docs.python.org/3/library/constants.html#None" title="(in Python v3.12)"><code class="docutils literal notranslate"><span class="pre">None</span></code></a></span></dt><dd><p>Use this schema instead of inferring a schema from partition |
| values. Partition values will be validated against this schema |
| before accumulation into the Partitioning’s dictionary.</p> |
| </dd> |
| <dt><strong>segment_encoding</strong><span class="classifier"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.12)"><code class="docutils literal notranslate"><span class="pre">str</span></code></a>, default “uri”</span></dt><dd><p>After splitting paths into segments, decode the segments. Valid |
| values are “uri” (URI-decode segments) and “none” (leave as-is).</p> |
| </dd> |
| </dl> |
| </dd> |
| <dt class="field-even">Returns<span class="colon">:</span></dt> |
| <dd class="field-even"><dl class="simple"> |
| <dt><a class="reference internal" href="pyarrow.dataset.PartitioningFactory.html#pyarrow.dataset.PartitioningFactory" title="pyarrow.dataset.PartitioningFactory"><code class="xref py py-obj docutils literal notranslate"><span class="pre">PartitioningFactory</span></code></a></dt><dd><p>To be used in the FileSystemFactoryOptions.</p> |
| </dd> |
| </dl> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt class="sig sig-object py" id="pyarrow.dataset.FilenamePartitioning.parse"> |
| <span class="sig-name descname"><span class="pre">parse</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">self</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">path</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.dataset.FilenamePartitioning.parse" title="Permalink to this definition">#</a></dt> |
| <dd><p>Parse a path into a partition expression.</p> |
| <dl class="field-list"> |
| <dt class="field-odd">Parameters<span class="colon">:</span></dt> |
| <dd class="field-odd"><dl> |
| <dt><strong>path</strong><span class="classifier"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.12)"><code class="docutils literal notranslate"><span class="pre">str</span></code></a></span></dt><dd></dd> |
| </dl> |
| </dd> |
| <dt class="field-even">Returns<span class="colon">:</span></dt> |
| <dd class="field-even"><dl class="simple"> |
| <dt><a class="reference internal" href="pyarrow.dataset.Expression.html#pyarrow.dataset.Expression" title="pyarrow.dataset.Expression"><code class="xref py py-obj docutils literal notranslate"><span class="pre">pyarrow.dataset.Expression</span></code></a></dt><dd></dd> |
| </dl> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="py attribute"> |
| <dt class="sig sig-object py" id="pyarrow.dataset.FilenamePartitioning.schema"> |
| <span class="sig-name descname"><span class="pre">schema</span></span><a class="headerlink" href="#pyarrow.dataset.FilenamePartitioning.schema" title="Permalink to this definition">#</a></dt> |
| <dd><p>The arrow Schema attached to the partitioning.</p> |
| </dd></dl> |
| |
| </dd></dl> |
| |
| </section> |
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| <li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#pyarrow.dataset.FilenamePartitioning"><code class="docutils literal notranslate"><span class="pre">FilenamePartitioning</span></code></a><ul class="visible nav section-nav flex-column"> |
| <li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#pyarrow.dataset.FilenamePartitioning.__init__"><code class="docutils literal notranslate"><span class="pre">FilenamePartitioning.__init__()</span></code></a></li> |
| <li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#pyarrow.dataset.FilenamePartitioning.dictionaries"><code class="docutils literal notranslate"><span class="pre">FilenamePartitioning.dictionaries</span></code></a></li> |
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| <li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#pyarrow.dataset.FilenamePartitioning.parse"><code class="docutils literal notranslate"><span class="pre">FilenamePartitioning.parse()</span></code></a></li> |
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