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| <section id="the-gandiva-expression-compiler"> |
| <h1>The Gandiva Expression Compiler<a class="headerlink" href="#the-gandiva-expression-compiler" title="Permalink to this heading">#</a></h1> |
| <p>Gandiva is a runtime expression compiler that uses <a class="reference external" href="https://llvm.org/">LLVM</a> to generate |
| efficient native code for compute on Arrow record batches. |
| Gandiva only handles projections and filters; for other transformations, see |
| <a class="reference internal" href="compute.html#compute-cpp"><span class="std std-ref">Compute Functions</span></a>.</p> |
| <p>Gandiva was designed to take advantage of the Arrow memory format and modern |
| hardware. From the Arrow memory model, since Arrow arrays have separate buffers for values and |
| validity bitmaps, values and their null status can often be processed |
| independently, allowing for better instruction pipelining. On modern hardware, |
| compiling expressions using LLVM allows the execution to be optimized |
| to the local runtime environment and hardware, including available SIMD |
| instructions. To reduce optimization overhead, many Gandiva functions are |
| pre-compiled into LLVM IR (intermediate representation).</p> |
| <section id="expression-projector-and-filter"> |
| <h2>Expression, Projector and Filter<a class="headerlink" href="#expression-projector-and-filter" title="Permalink to this heading">#</a></h2> |
| <p>To effectively utilize Gandiva, you will construct expression trees with <code class="docutils literal notranslate"><span class="pre">TreeExprBuilder</span></code>, |
| including the creation of function nodes, if-else logic, and boolean expressions. |
| Subsequently, leverage <code class="docutils literal notranslate"><span class="pre">Projector</span></code> or <code class="docutils literal notranslate"><span class="pre">Filter</span></code> execution kernels to efficiently evaluate these expressions. |
| See <a class="reference internal" href="gandiva/expr_projector_filter.html"><span class="doc">Gandiva Expression, Projector, and Filter</span></a> for more details.</p> |
| </section> |
| <section id="external-functions-development"> |
| <h2>External Functions Development<a class="headerlink" href="#external-functions-development" title="Permalink to this heading">#</a></h2> |
| <p>Gandiva offers the capability of integrating external functions, encompassing |
| both C functions and IR functions. This feature broadens the spectrum of |
| functions that can be applied within Gandiva expressions. For developers |
| looking to customize and enhance their computational solutions, |
| Gandiva provides the opportunity to develop and register their own external |
| functions, thus allowing for a more tailored and flexible use of the Gandiva |
| environment. |
| See <a class="reference internal" href="gandiva/external_func.html"><span class="doc">Gandiva External Functions Development Guide</span></a> for more details.</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="gandiva/expr_projector_filter.html">Gandiva Expression, Projector, and Filter</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="gandiva/expr_projector_filter.html#building-expressions">Building Expressions</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="gandiva/expr_projector_filter.html#projectors-and-filters">Projectors and Filters</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="gandiva/external_func.html">Gandiva External Functions Development Guide</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="gandiva/external_func.html#introduction">Introduction</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="gandiva/external_func.html#overview-of-external-function-types-in-gandiva">Overview of External Function Types in Gandiva</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="gandiva/external_func.html#external-function-registration">External function registration</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="gandiva/external_func.html#conclusion">Conclusion</a></li> |
| </ul> |
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