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href="contributor-guide/api-health.html"> API health policy </a> </li> <li class="toctree-l1"> <a class="reference internal" href="contributor-guide/howtos.html"> HOWTOs </a> </li> <li class="toctree-l1"> <a class="reference internal" href="contributor-guide/roadmap.html"> Roadmap </a> </li> <li class="toctree-l1"> <a class="reference internal" href="contributor-guide/governance.html"> Governance </a> </li> <li class="toctree-l1"> <a class="reference internal" href="contributor-guide/inviting.html"> Inviting New Committers and PMC Members </a> </li> <li class="toctree-l1 has-children"> <a class="reference internal" href="contributor-guide/specification/index.html"> Specifications </a> <input class="toctree-checkbox" id="toctree-checkbox-3" name="toctree-checkbox-3" type="checkbox"/> <label for="toctree-checkbox-3"> <i class="fas fa-chevron-down"> </i> </label> <ul> <li class="toctree-l2"> <a class="reference internal" href="contributor-guide/specification/invariants.html"> Invariants </a> </li> <li class="toctree-l2"> <a class="reference internal" href="contributor-guide/specification/output-field-name-semantic.html"> Output field name semantics </a> </li> </ul> </li> <li class="toctree-l1"> <a class="reference internal" href="contributor-guide/gsoc_application_guidelines.html"> GSoC Application Guidelines </a> </li> <li class="toctree-l1"> <a class="reference internal" href="contributor-guide/gsoc_project_ideas.html"> GSoC Project Ideas </a> </li> </ul> <p aria-level="2" class="caption" role="heading"> <span class="caption-text"> DataFusion Subprojects </span> </p> <ul class="nav bd-sidenav"> <li class="toctree-l1"> <a class="reference external" href="https://arrow.apache.org/ballista/"> DataFusion Ballista </a> </li> <li class="toctree-l1"> <a class="reference external" href="https://datafusion.apache.org/comet/"> DataFusion Comet </a> </li> <li class="toctree-l1"> <a class="reference external" href="https://datafusion.apache.org/python/"> DataFusion Python </a> </li> </ul> </div> <a class="navbar-brand" href="#"> <img src="_static/images/2x_bgwhite_original.png" class="logo" alt="logo"> </a> </nav> </div> <div class="sidebar-end-items"> </div> </div> <div class="d-none d-xl-block col-xl-2 bd-toc"> <div class="toc-item"> <nav id="bd-toc-nav"> </nav> </div> <div class="toc-item"> <div class="tocsection editthispage"> <a href="https://github.com/apache/arrow-datafusion/edit/main/docs/source/index.rst"> <i class="fas fa-pencil-alt"></i> Edit this page </a> </div> </div> </div> <main class="col-12 col-md-9 col-xl-7 py-md-5 pl-md-5 pr-md-4 bd-content" role="main"> <div> <img alt="DataFusion Logo" src="_images/2x_bgwhite_original.png" /> <section id="apache-datafusion"> <h1>Apache DataFusion<a class="headerlink" href="#apache-datafusion" title="Link to this heading">¶</a></h1> <style type="text/css"> .custom-social-badge{display:inline;padding:4px}.custom-social-badge a{text-decoration:none;outline:0}.custom-social-badge 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.27-1.53-1.03-2.2-.82-2.2-.82-.44 1.1-.16 1.92-.08 2.12-.51.56-.82 1.28-.82 2.15 0 3.06 1.86 3.75 3.64 3.95-.23.2-.44.55-.51 1.07-.46.21-1.61.55-2.33-.66-.15-.24-.6-.83-1.23-.82-.67.01-.27.38.01.53.34.19.73.9.82 1.13.16.45.68 1.31 2.69.94 0 .67.01 1.3.01 1.49 0 .21-.15.45-.55.38A7.995 7.995 0 0 1 0 8c0-4.42 3.58-8 8-8Z" fill="#000"></path></svg> <span>Fork</span></a></div> </span> </div><p>DataFusion is an extensible query engine written in <a class="reference external" href="http://rustlang.org">Rust</a> that uses <a class="reference external" href="https://arrow.apache.org">Apache Arrow</a> as its in-memory format.</p> <p>The documentation on this site is for the <a class="reference external" href="https://github.com/apache/datafusion">core DataFusion project</a>, which contains libraries and binaries for developers building fast and feature rich database and analytic systems, customized to particular workloads. See <a class="reference external" href="https://datafusion.apache.org/user-guide/introduction.html#use-cases">use cases</a> for examples.</p> <p>The following related subprojects target end users and have separate documentation.</p> <ul class="simple"> <li><p><a class="reference external" href="https://datafusion.apache.org/python/">DataFusion Python</a> offers a Python interface for SQL and DataFrame queries.</p></li> <li><p><a class="reference external" href="https://github.com/apache/datafusion-ray/">DataFusion Ray</a> provides a distributed version of DataFusion that scales out on <a class="reference external" href="https://www.ray.io">Ray</a> clusters.</p></li> <li><p><a class="reference external" href="https://datafusion.apache.org/comet/">DataFusion Comet</a> is an accelerator for Apache Spark based on DataFusion.</p></li> </ul> <p>“Out of the box,” DataFusion offers <a class="reference external" href="https://datafusion.apache.org/user-guide/sql/index.html">SQL</a> and <a class="reference external" href="https://docs.rs/datafusion/latest/datafusion/dataframe/struct.DataFrame.html">Dataframe</a> APIs, excellent <a class="reference external" href="https://benchmark.clickhouse.com/">performance</a>, built-in support for CSV, Parquet, JSON, and Avro, extensive customization, and a great community. <a class="reference external" href="https://github.com/apache/datafusion-python">Python Bindings</a> are also available.</p> <p>DataFusion features a full query planner, a columnar, streaming, multi-threaded, vectorized execution engine, and partitioned data sources. You can customize DataFusion at almost all points including additional data sources, query languages, functions, custom operators and more. See the <a class="reference external" href="https://datafusion.apache.org/contributor-guide/architecture.html">Architecture</a> section for more details.</p> <p>To get started, see</p> <ul class="simple"> <li><p>The <a class="reference external" href="user-guide/example-usage.html">example usage</a> section of the user guide and the <a class="reference external" href="https://github.com/apache/datafusion/tree/main/datafusion-examples">datafusion-examples</a> directory.</p></li> <li><p>The <a class="reference external" href="library-user-guide/index.html">library user guide</a> for examples of using DataFusion’s extension APIs</p></li> <li><p>The <a class="reference external" href="contributor-guide/index.html#developer-s-guide">developer’s guide</a> for contributing and <a class="reference external" href="contributor-guide/communication.html">communication</a> for getting in touch with us.</p></li> </ul> <div class="toctree-wrapper compound" id="toc-asf-links"> <p aria-level="2" class="caption" role="heading"><span class="caption-text">ASF Links</span></p> <ul> <li class="toctree-l1"><a class="reference external" href="https://apache.org">Apache Software Foundation</a></li> <li class="toctree-l1"><a class="reference external" href="https://www.apache.org/licenses/">License</a></li> <li class="toctree-l1"><a class="reference external" href="https://www.apache.org/foundation/sponsorship.html">Donate</a></li> <li class="toctree-l1"><a class="reference external" href="https://www.apache.org/foundation/thanks.html">Thanks</a></li> <li class="toctree-l1"><a class="reference external" href="https://www.apache.org/security/">Security</a></li> </ul> </div> <div class="toctree-wrapper compound" id="toc-links"> <p aria-level="2" class="caption" role="heading"><span class="caption-text">Links</span></p> <ul> <li class="toctree-l1"><a class="reference external" href="https://github.com/apache/datafusion">GitHub and Issue Tracker</a></li> <li class="toctree-l1"><a 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