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| <section id="datafusion-in-python"> |
| <h1>DataFusion in Python<a class="headerlink" href="#datafusion-in-python" title="Link to this heading">¶</a></h1> |
| <p>This is a Python library that binds to <a class="reference external" href="https://arrow.apache.org/">Apache Arrow</a> in-memory query engine <a class="reference external" href="https://github.com/apache/datafusion">DataFusion</a>.</p> |
| <p>Like pyspark, it allows you to build a plan through SQL or a DataFrame API against in-memory data, parquet or CSV files, run it in a multi-threaded environment, and obtain the result back in Python.</p> |
| <p>It also allows you to use UDFs and UDAFs for complex operations.</p> |
| <p>The major advantage of this library over other execution engines is that this library achieves zero-copy between Python and its execution engine: there is no cost in using UDFs, UDAFs, and collecting the results to Python apart from having to lock the GIL when running those operations.</p> |
| <p>Its query engine, DataFusion, is written in <a class="reference external" href="https://www.rust-lang.org">Rust</a>, which makes strong assumptions about thread safety and lack of memory leaks.</p> |
| <p>Technically, zero-copy is achieved via the <a class="reference external" href="https://arrow.apache.org/docs/format/CDataInterface.html">c data interface</a>.</p> |
| <section id="install"> |
| <h2>Install<a class="headerlink" href="#install" title="Link to this heading">¶</a></h2> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>pip<span class="w"> </span>install<span class="w"> </span>datafusion |
| </pre></div> |
| </div> |
| </section> |
| <section id="example"> |
| <h2>Example<a class="headerlink" href="#example" title="Link to this heading">¶</a></h2> |
| <div class="highlight-ipython notranslate"><div class="highlight"><pre><span></span><span class="n">In</span> <span class="p">[</span><span class="mi">1</span><span class="p">]:</span> <span class="kn">from</span><span class="w"> </span><span class="nn">datafusion</span><span class="w"> </span><span class="kn">import</span> <span class="n">SessionContext</span> |
| |
| <span class="n">In</span> <span class="p">[</span><span class="mi">2</span><span class="p">]:</span> <span class="n">ctx</span> <span class="o">=</span> <span class="n">SessionContext</span><span class="p">()</span> |
| |
| <span class="n">In</span> <span class="p">[</span><span class="mi">3</span><span class="p">]:</span> <span class="n">df</span> <span class="o">=</span> <span class="n">ctx</span><span class="o">.</span><span class="n">read_csv</span><span class="p">(</span><span class="s2">"pokemon.csv"</span><span class="p">)</span> |
| |
| <span class="n">In</span> <span class="p">[</span><span class="mi">4</span><span class="p">]:</span> <span class="n">df</span><span class="o">.</span><span class="n">show</span><span class="p">()</span> |
| <span class="n">DataFrame</span><span class="p">()</span> |
| <span class="o">+----+---------------------------+--------+--------+-------+----+--------+---------+---------+---------+-------+------------+-----------+</span> |
| <span class="o">|</span> <span class="c1"># | Name | Type 1 | Type 2 | Total | HP | Attack | Defense | Sp. Atk | Sp. Def | Speed | Generation | Legendary |</span> |
| <span class="o">+----+---------------------------+--------+--------+-------+----+--------+---------+---------+---------+-------+------------+-----------+</span> |
| <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">Bulbasaur</span> <span class="o">|</span> <span class="n">Grass</span> <span class="o">|</span> <span class="n">Poison</span> <span class="o">|</span> <span class="mi">318</span> <span class="o">|</span> <span class="mi">45</span> <span class="o">|</span> <span class="mi">49</span> <span class="o">|</span> <span class="mi">49</span> <span class="o">|</span> <span class="mi">65</span> <span class="o">|</span> <span class="mi">65</span> <span class="o">|</span> <span class="mi">45</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">2</span> <span class="o">|</span> <span class="n">Ivysaur</span> <span class="o">|</span> <span class="n">Grass</span> <span class="o">|</span> <span class="n">Poison</span> <span class="o">|</span> <span class="mi">405</span> <span class="o">|</span> <span class="mi">60</span> <span class="o">|</span> <span class="mi">62</span> <span class="o">|</span> <span class="mi">63</span> <span class="o">|</span> <span class="mi">80</span> <span class="o">|</span> <span class="mi">80</span> <span class="o">|</span> <span class="mi">60</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">3</span> <span class="o">|</span> <span class="n">Venusaur</span> <span class="o">|</span> <span class="n">Grass</span> <span class="o">|</span> <span class="n">Poison</span> <span class="o">|</span> <span class="mi">525</span> <span class="o">|</span> <span class="mi">80</span> <span class="o">|</span> <span class="mi">82</span> <span class="o">|</span> <span class="mi">83</span> <span class="o">|</span> <span class="mi">100</span> <span class="o">|</span> <span class="mi">100</span> <span class="o">|</span> <span class="mi">80</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">3</span> <span class="o">|</span> <span class="n">VenusaurMega</span> <span class="n">Venusaur</span> <span class="o">|</span> <span class="n">Grass</span> <span class="o">|</span> <span class="n">Poison</span> <span class="o">|</span> <span class="mi">625</span> <span class="o">|</span> <span class="mi">80</span> <span class="o">|</span> <span class="mi">100</span> <span class="o">|</span> <span class="mi">123</span> <span class="o">|</span> <span class="mi">122</span> <span class="o">|</span> <span class="mi">120</span> <span class="o">|</span> <span class="mi">80</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">4</span> <span class="o">|</span> <span class="n">Charmander</span> <span class="o">|</span> <span class="n">Fire</span> <span class="o">|</span> <span class="o">|</span> <span class="mi">309</span> <span class="o">|</span> <span class="mi">39</span> <span class="o">|</span> <span class="mi">52</span> <span class="o">|</span> <span class="mi">43</span> <span class="o">|</span> <span class="mi">60</span> <span class="o">|</span> <span class="mi">50</span> <span class="o">|</span> <span class="mi">65</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">5</span> <span class="o">|</span> <span class="n">Charmeleon</span> <span class="o">|</span> <span class="n">Fire</span> <span class="o">|</span> <span class="o">|</span> <span class="mi">405</span> <span class="o">|</span> <span class="mi">58</span> <span class="o">|</span> <span class="mi">64</span> <span class="o">|</span> <span class="mi">58</span> <span class="o">|</span> <span class="mi">80</span> <span class="o">|</span> <span class="mi">65</span> <span class="o">|</span> <span class="mi">80</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">6</span> <span class="o">|</span> <span class="n">Charizard</span> <span class="o">|</span> <span class="n">Fire</span> <span class="o">|</span> <span class="n">Flying</span> <span class="o">|</span> <span class="mi">534</span> <span class="o">|</span> <span class="mi">78</span> <span class="o">|</span> <span class="mi">84</span> <span class="o">|</span> <span class="mi">78</span> <span class="o">|</span> <span class="mi">109</span> <span class="o">|</span> <span class="mi">85</span> <span class="o">|</span> <span class="mi">100</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">6</span> <span class="o">|</span> <span class="n">CharizardMega</span> <span class="n">Charizard</span> <span class="n">X</span> <span class="o">|</span> <span class="n">Fire</span> <span class="o">|</span> <span class="n">Dragon</span> <span class="o">|</span> <span class="mi">634</span> <span class="o">|</span> <span class="mi">78</span> <span class="o">|</span> <span class="mi">130</span> <span class="o">|</span> <span class="mi">111</span> <span class="o">|</span> <span class="mi">130</span> <span class="o">|</span> <span class="mi">85</span> <span class="o">|</span> <span class="mi">100</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">6</span> <span class="o">|</span> <span class="n">CharizardMega</span> <span class="n">Charizard</span> <span class="n">Y</span> <span class="o">|</span> <span class="n">Fire</span> <span class="o">|</span> <span class="n">Flying</span> <span class="o">|</span> <span class="mi">634</span> <span class="o">|</span> <span class="mi">78</span> <span class="o">|</span> <span class="mi">104</span> <span class="o">|</span> <span class="mi">78</span> <span class="o">|</span> <span class="mi">159</span> <span class="o">|</span> <span class="mi">115</span> <span class="o">|</span> <span class="mi">100</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">7</span> <span class="o">|</span> <span class="n">Squirtle</span> <span class="o">|</span> <span class="n">Water</span> <span class="o">|</span> <span class="o">|</span> <span class="mi">314</span> <span class="o">|</span> <span class="mi">44</span> <span class="o">|</span> <span class="mi">48</span> <span class="o">|</span> <span class="mi">65</span> <span class="o">|</span> <span class="mi">50</span> <span class="o">|</span> <span class="mi">64</span> <span class="o">|</span> <span class="mi">43</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">8</span> <span class="o">|</span> <span class="n">Wartortle</span> <span class="o">|</span> <span class="n">Water</span> <span class="o">|</span> <span class="o">|</span> <span class="mi">405</span> <span class="o">|</span> <span class="mi">59</span> <span class="o">|</span> <span class="mi">63</span> <span class="o">|</span> <span class="mi">80</span> <span class="o">|</span> <span class="mi">65</span> <span class="o">|</span> <span class="mi">80</span> <span class="o">|</span> <span class="mi">58</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">9</span> <span class="o">|</span> <span class="n">Blastoise</span> <span class="o">|</span> <span class="n">Water</span> <span class="o">|</span> <span class="o">|</span> <span class="mi">530</span> <span class="o">|</span> <span class="mi">79</span> <span class="o">|</span> <span class="mi">83</span> <span class="o">|</span> <span class="mi">100</span> <span class="o">|</span> <span class="mi">85</span> <span class="o">|</span> <span class="mi">105</span> <span class="o">|</span> <span class="mi">78</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">9</span> <span class="o">|</span> <span class="n">BlastoiseMega</span> <span class="n">Blastoise</span> <span class="o">|</span> <span class="n">Water</span> <span class="o">|</span> <span class="o">|</span> <span class="mi">630</span> <span class="o">|</span> <span class="mi">79</span> <span class="o">|</span> <span class="mi">103</span> <span class="o">|</span> <span class="mi">120</span> <span class="o">|</span> <span class="mi">135</span> <span class="o">|</span> <span class="mi">115</span> <span class="o">|</span> <span class="mi">78</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">10</span> <span class="o">|</span> <span class="n">Caterpie</span> <span class="o">|</span> <span class="n">Bug</span> <span class="o">|</span> <span class="o">|</span> <span class="mi">195</span> <span class="o">|</span> <span class="mi">45</span> <span class="o">|</span> <span class="mi">30</span> <span class="o">|</span> <span class="mi">35</span> <span class="o">|</span> <span class="mi">20</span> <span class="o">|</span> <span class="mi">20</span> <span class="o">|</span> <span class="mi">45</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">11</span> <span class="o">|</span> <span class="n">Metapod</span> <span class="o">|</span> <span class="n">Bug</span> <span class="o">|</span> <span class="o">|</span> <span class="mi">205</span> <span class="o">|</span> <span class="mi">50</span> <span class="o">|</span> <span class="mi">20</span> <span class="o">|</span> <span class="mi">55</span> <span class="o">|</span> <span class="mi">25</span> <span class="o">|</span> <span class="mi">25</span> <span class="o">|</span> <span class="mi">30</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">12</span> <span class="o">|</span> <span class="n">Butterfree</span> <span class="o">|</span> <span class="n">Bug</span> <span class="o">|</span> <span class="n">Flying</span> <span class="o">|</span> <span class="mi">395</span> <span class="o">|</span> <span class="mi">60</span> <span class="o">|</span> <span class="mi">45</span> <span class="o">|</span> <span class="mi">50</span> <span class="o">|</span> <span class="mi">90</span> <span class="o">|</span> <span class="mi">80</span> <span class="o">|</span> <span class="mi">70</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">13</span> <span class="o">|</span> <span class="n">Weedle</span> <span class="o">|</span> <span class="n">Bug</span> <span class="o">|</span> <span class="n">Poison</span> <span class="o">|</span> <span class="mi">195</span> <span class="o">|</span> <span class="mi">40</span> <span class="o">|</span> <span class="mi">35</span> <span class="o">|</span> <span class="mi">30</span> <span class="o">|</span> <span class="mi">20</span> <span class="o">|</span> <span class="mi">20</span> <span class="o">|</span> <span class="mi">50</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">14</span> <span class="o">|</span> <span class="n">Kakuna</span> <span class="o">|</span> <span class="n">Bug</span> <span class="o">|</span> <span class="n">Poison</span> <span class="o">|</span> <span class="mi">205</span> <span class="o">|</span> <span class="mi">45</span> <span class="o">|</span> <span class="mi">25</span> <span class="o">|</span> <span class="mi">50</span> <span class="o">|</span> <span class="mi">25</span> <span class="o">|</span> <span class="mi">25</span> <span class="o">|</span> <span class="mi">35</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">15</span> <span class="o">|</span> <span class="n">Beedrill</span> <span class="o">|</span> <span class="n">Bug</span> <span class="o">|</span> <span class="n">Poison</span> <span class="o">|</span> <span class="mi">395</span> <span class="o">|</span> <span class="mi">65</span> <span class="o">|</span> <span class="mi">90</span> <span class="o">|</span> <span class="mi">40</span> <span class="o">|</span> <span class="mi">45</span> <span class="o">|</span> <span class="mi">80</span> <span class="o">|</span> <span class="mi">75</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="mi">15</span> <span class="o">|</span> <span class="n">BeedrillMega</span> <span class="n">Beedrill</span> <span class="o">|</span> <span class="n">Bug</span> <span class="o">|</span> <span class="n">Poison</span> <span class="o">|</span> <span class="mi">495</span> <span class="o">|</span> <span class="mi">65</span> <span class="o">|</span> <span class="mi">150</span> <span class="o">|</span> <span class="mi">40</span> <span class="o">|</span> <span class="mi">15</span> <span class="o">|</span> <span class="mi">80</span> <span class="o">|</span> <span class="mi">145</span> <span class="o">|</span> <span class="mi">1</span> <span class="o">|</span> <span class="n">false</span> <span class="o">|</span> |
| <span class="o">+----+---------------------------+--------+--------+-------+----+--------+---------+---------+---------+-------+------------+-----------+</span> |
| </pre></div> |
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