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| <div class="section" id="pyarrow-dataset-expression"> |
| <h1>pyarrow.dataset.Expression<a class="headerlink" href="#pyarrow-dataset-expression" title="Permalink to this headline">¶</a></h1> |
| <dl class="py class"> |
| <dt id="pyarrow.dataset.Expression"> |
| <em class="property">class </em><code class="sig-prename descclassname">pyarrow.dataset.</code><code class="sig-name descname">Expression</code><a class="headerlink" href="#pyarrow.dataset.Expression" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">pyarrow.lib._Weakrefable</span></code></p> |
| <dl class="py method"> |
| <dt id="pyarrow.dataset.Expression.__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.Expression.__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.Expression.__init__" title="pyarrow.dataset.Expression.__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.Expression.assume" title="pyarrow.dataset.Expression.assume"><code class="xref py py-obj docutils literal notranslate"><span class="pre">assume</span></code></a></p></td> |
| <td><p>Simplify to an equivalent Expression given assumed constraints.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.dataset.Expression.cast" title="pyarrow.dataset.Expression.cast"><code class="xref py py-obj docutils literal notranslate"><span class="pre">cast</span></code></a></p></td> |
| <td><p>Explicitly change the expression’s data type</p></td> |
| </tr> |
| <tr class="row-even"><td><p><a class="reference internal" href="#pyarrow.dataset.Expression.equals" title="pyarrow.dataset.Expression.equals"><code class="xref py py-obj docutils literal notranslate"><span class="pre">equals</span></code></a></p></td> |
| <td><p></p></td> |
| </tr> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.dataset.Expression.is_valid" title="pyarrow.dataset.Expression.is_valid"><code class="xref py py-obj docutils literal notranslate"><span class="pre">is_valid</span></code></a></p></td> |
| <td><p>Checks whether the expression is not-null (valid)</p></td> |
| </tr> |
| <tr class="row-even"><td><p><a class="reference internal" href="#pyarrow.dataset.Expression.isin" title="pyarrow.dataset.Expression.isin"><code class="xref py py-obj docutils literal notranslate"><span class="pre">isin</span></code></a></p></td> |
| <td><p>Checks whether the expression is contained in values</p></td> |
| </tr> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.dataset.Expression.validate" title="pyarrow.dataset.Expression.validate"><code class="xref py py-obj docutils literal notranslate"><span class="pre">validate</span></code></a></p></td> |
| <td><p>Validate this expression for execution against a schema.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <dl class="py method"> |
| <dt id="pyarrow.dataset.Expression.assume"> |
| <code class="sig-name descname">assume</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.dataset.Expression.assume" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Simplify to an equivalent Expression given assumed constraints.</p> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt id="pyarrow.dataset.Expression.cast"> |
| <code class="sig-name descname">cast</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.dataset.Expression.cast" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Explicitly change the expression’s data type</p> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt id="pyarrow.dataset.Expression.equals"> |
| <code class="sig-name descname">equals</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.dataset.Expression.equals" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="py method"> |
| <dt id="pyarrow.dataset.Expression.is_valid"> |
| <code class="sig-name descname">is_valid</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.dataset.Expression.is_valid" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Checks whether the expression is not-null (valid)</p> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt id="pyarrow.dataset.Expression.isin"> |
| <code class="sig-name descname">isin</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.dataset.Expression.isin" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Checks whether the expression is contained in values</p> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt id="pyarrow.dataset.Expression.validate"> |
| <code class="sig-name descname">validate</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.dataset.Expression.validate" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Validate this expression for execution against a schema.</p> |
| <p>This will check that all reference fields are present (fields not in |
| the schema will be replaced with null) and all subexpressions are |
| executable. Returns the type to which this expression will evaluate.</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>) – Schema to execute the expression on.</p> |
| </dd> |
| <dt class="field-even">Returns</dt> |
| <dd class="field-even"><p><strong>type</strong> (<em>DataType</em>)</p> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| </dd></dl> |
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