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| <section id="apache-datafusion-java"> |
| <h1>Apache DataFusion Java<a class="headerlink" href="#apache-datafusion-java" title="Link to this heading">#</a></h1> |
| <p>Java bindings for <a class="reference external" href="https://datafusion.apache.org/">Apache DataFusion</a>. Queries run in native Rust and results |
| return to the JVM as <a class="reference external" href="https://arrow.apache.org/">Apache Arrow</a> batches via the Arrow C Data Interface.</p> |
| <blockquote> |
| <div><p>Early development: the API will change between releases. Bug reports |
| and contributions welcome.</p> |
| </div></blockquote> |
| <section id="quickstart"> |
| <h2>Quickstart<a class="headerlink" href="#quickstart" title="Link to this heading">#</a></h2> |
| <div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.arrow.memory.RootAllocator</span><span class="p">;</span> |
| <span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.arrow.vector.ipc.ArrowReader</span><span class="p">;</span> |
| <span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.datafusion.DataFrame</span><span class="p">;</span> |
| <span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.datafusion.SessionContext</span><span class="p">;</span> |
| |
| <span class="k">try</span><span class="w"> </span><span class="p">(</span><span class="kd">var</span><span class="w"> </span><span class="n">allocator</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">RootAllocator</span><span class="p">();</span> |
| <span class="w"> </span><span class="kd">var</span><span class="w"> </span><span class="n">ctx</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">SessionContext</span><span class="p">())</span><span class="w"> </span><span class="p">{</span> |
| |
| <span class="w"> </span><span class="n">ctx</span><span class="p">.</span><span class="na">registerParquet</span><span class="p">(</span><span class="s">"orders"</span><span class="p">,</span><span class="w"> </span><span class="s">"/path/to/orders.parquet"</span><span class="p">);</span> |
| |
| <span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="p">(</span><span class="n">DataFrame</span><span class="w"> </span><span class="n">df</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ctx</span><span class="p">.</span><span class="na">sql</span><span class="p">(</span> |
| <span class="w"> </span><span class="s">"SELECT o_orderpriority, COUNT(*) AS n "</span><span class="w"> </span><span class="o">+</span> |
| <span class="w"> </span><span class="s">"FROM orders GROUP BY o_orderpriority"</span><span class="p">);</span> |
| <span class="w"> </span><span class="n">ArrowReader</span><span class="w"> </span><span class="n">reader</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">df</span><span class="p">.</span><span class="na">collect</span><span class="p">(</span><span class="n">allocator</span><span class="p">))</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="n">reader</span><span class="p">.</span><span class="na">loadNextBatch</span><span class="p">())</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="kd">var</span><span class="w"> </span><span class="n">batch</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">reader</span><span class="p">.</span><span class="na">getVectorSchemaRoot</span><span class="p">();</span> |
| <span class="w"> </span><span class="c1">// ...</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>See the <a class="reference internal" href="user-guide/index.html"><span class="std std-doc">User Guide</span></a> for installation, the DataFrame and |
| SQL APIs, and Parquet ingestion. See the <a class="reference internal" href="contributor-guide/index.html"><span class="std std-doc">Contributor Guide</span></a> |
| for build, test, and release workflows.</p> |
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