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15.794 6.99 15.794 15.793 0 80.261 63.69 145.635 142.01 145.635s142.011-65.374 142.011-145.635c0-8.803 6.99-15.793 15.794-15.793s15.793 6.99 15.793 15.793c0 95.019-73.789 172.82-165.96 177.093z"></path></svg><span>About 1 min</span><meta property="timeRequired" content="PT1M"></span><!----><!----></div><hr></div><div class="vp-toc-placeholder"><aside id="toc"><!--[--><!----><!--]--><div class="vp-toc-header">On This Page<button type="button" class="print-button" title="Print"><svg xmlns="http://www.w3.org/2000/svg" class="icon print-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="print icon"><path d="M819.2 364.8h-44.8V128c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v236.8h-44.8C145.067 364.8 96 413.867 96 473.6v192c0 59.733 49.067 108.8 108.8 108.8h44.8V896c0 17.067 14.933 32 32 32h460.8c17.067 0 32-14.933 32-32V774.4h44.8c59.733 0 108.8-49.067 108.8-108.8v-192c0-59.733-49.067-108.8-108.8-108.8zM313.6 160h396.8v204.8H313.6V160zm396.8 704H313.6V620.8h396.8V864zM864 665.6c0 25.6-19.2 44.8-44.8 44.8h-44.8V588.8c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v121.6h-44.8c-25.6 0-44.8-19.2-44.8-44.8v-192c0-25.6 19.2-44.8 44.8-44.8h614.4c25.6 0 44.8 19.2 44.8 44.8v192z"></path></svg></button><div class="arrow end"></div></div><div class="vp-toc-wrapper"><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#priority-of-operators">Priority of Operators</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#about">About</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#quick-start-1">Quick Start</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#download">Download</a></li><!----><!--]--></ul><div class="vp-toc-marker" style="top:-1.7rem;"></div></div><!--[--><!----><!--]--></aside></div><!--[--><!----><!--]--><div class="theme-hope-content"><h1 id="quick-start" tabindex="-1"><a class="header-anchor" href="#quick-start"><span>Quick Start</span></a></h1><h2 id="priority-of-operators" tabindex="-1"><a class="header-anchor" href="#priority-of-operators"><span>Priority of Operators</span></a></h2><table><thead><tr><th style="text-align:center;">priority</th><th style="text-align:left;">operator</th><th style="text-align:left;">meaning</th></tr></thead><tbody><tr><td style="text-align:center;">1</td><td style="text-align:left;"><code>-</code></td><td style="text-align:left;">Unary operator negative</td></tr><tr><td style="text-align:center;">1</td><td style="text-align:left;"><code>+</code></td><td style="text-align:left;">Unary operator positive</td></tr><tr><td style="text-align:center;">1</td><td style="text-align:left;"><code>!</code></td><td style="text-align:left;">Unary operator negation</td></tr><tr><td style="text-align:center;">2</td><td style="text-align:left;"><code>*</code></td><td style="text-align:left;">Binary operator multiply</td></tr><tr><td style="text-align:center;">2</td><td style="text-align:left;"><code>/</code></td><td style="text-align:left;">Binary operator division</td></tr><tr><td style="text-align:center;">2</td><td style="text-align:left;"><code>%</code></td><td style="text-align:left;">Binary operator remainder</td></tr><tr><td style="text-align:center;">3</td><td style="text-align:left;"><code>+</code></td><td style="text-align:left;">Binary operator add</td></tr><tr><td style="text-align:center;">3</td><td style="text-align:left;"><code>-</code></td><td style="text-align:left;">Binary operator minus</td></tr><tr><td style="text-align:center;">4</td><td style="text-align:left;"><code>&gt;</code></td><td style="text-align:left;">Binary compare operator greater than</td></tr><tr><td style="text-align:center;">4</td><td style="text-align:left;"><code>&gt;=</code></td><td style="text-align:left;">Binary compare operator greater or equal to</td></tr><tr><td style="text-align:center;">4</td><td style="text-align:left;"><code>&lt;</code></td><td style="text-align:left;">Binary compare operator less than</td></tr><tr><td style="text-align:center;">4</td><td style="text-align:left;"><code>&lt;=</code></td><td style="text-align:left;">Binary compare operator less or equal to</td></tr><tr><td style="text-align:center;">4</td><td style="text-align:left;"><code>==</code></td><td style="text-align:left;">Binary compare operator equal to</td></tr><tr><td style="text-align:center;">4</td><td style="text-align:left;"><code>!=</code>/<code>&lt;&gt;</code></td><td style="text-align:left;">Binary compare operator non-equal to</td></tr><tr><td style="text-align:center;">5</td><td style="text-align:left;"><code>REGEXP</code></td><td style="text-align:left;"><code>REGEXP</code> operator</td></tr><tr><td style="text-align:center;">5</td><td style="text-align:left;"><code>LIKE</code></td><td style="text-align:left;"><code>LIKE</code> operator</td></tr><tr><td style="text-align:center;">6</td><td style="text-align:left;"><code>IN</code></td><td style="text-align:left;"><code>IN</code> operator</td></tr><tr><td style="text-align:center;">7</td><td style="text-align:left;"><code>and</code>/<code>&amp;</code>/<code>&amp;&amp;</code></td><td style="text-align:left;">Binary logic operator and</td></tr><tr><td style="text-align:center;">8</td><td style="text-align:left;"><code>or</code>/ | / ||</td><td style="text-align:left;">Binary logic operator or</td></tr></tbody></table><h2 id="about" tabindex="-1"><a class="header-anchor" href="#about"><span>About</span></a></h2><p>For applications based on time series data, data quality is vital.<br><strong>UDF Library</strong> is IoTDB User Defined Functions (UDF) about data quality, including data profiling, data quality evalution and data repairing.<br> It effectively meets the demand for data quality in the industrial field.</p><h2 id="quick-start-1" tabindex="-1"><a class="header-anchor" href="#quick-start-1"><span>Quick Start</span></a></h2><ol><li>Download the JAR with all dependencies and the script of registering UDF.</li><li>Copy the JAR package to <code>ext\udf</code> under the directory of IoTDB system (Please put JAR to this directory of all DataNodes if you use Cluster).</li><li>Run <code>sbin\start-server.bat</code> (for Windows) or <code>sbin\start-server.sh</code> (for Linux or MacOS) to start IoTDB server.</li><li>Copy the script to the directory of IoTDB system (under the root directory, at the same level as <code>sbin</code>), modify the parameters in the script if needed and run it to register UDF.</li></ol><h2 id="download" tabindex="-1"><a class="header-anchor" href="#download"><span>Download</span></a></h2><p>Since our codes are still under review, there are no codes in Apache repository. 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