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href="/UserGuide/Master/Ecosystem-Integration/Grafana-Plugin.html" class="nav-link sidebar-link sidebar-page" aria-label="Grafana-Plugin"><!---->Grafana-Plugin<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/UserGuide/Master/Ecosystem-Integration/Grafana-Connector.html" class="nav-link sidebar-link sidebar-page" aria-label="Grafana-Connector (Not Recommended)"><!---->Grafana-Connector (Not Recommended)<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/UserGuide/Master/Ecosystem-Integration/Zeppelin-IoTDB.html" class="nav-link sidebar-link sidebar-page" aria-label="Zeppelin-IoTDB"><!---->Zeppelin-IoTDB<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/UserGuide/Master/Ecosystem-Integration/DBeaver.html" class="nav-link sidebar-link sidebar-page" aria-label="DBeaver-IoTDB"><!---->DBeaver-IoTDB<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/UserGuide/Master/Ecosystem-Integration/MapReduce-TsFile.html" class="nav-link sidebar-link sidebar-page" aria-label="MapReduce-TsFile"><!---->MapReduce-TsFile<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/UserGuide/Master/Ecosystem-Integration/Spark-TsFile.html" class="nav-link sidebar-link sidebar-page" aria-label="Spark-TsFile"><!---->Spark-TsFile<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html" class="router-link-active router-link-exact-active nav-link active sidebar-link sidebar-page active" aria-label="Spark-IoTDB"><!---->Spark-IoTDB<!----></a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#supported-versions" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="Supported Versions"><!---->Supported Versions<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#precautions" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="Precautions"><!---->Precautions<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#deployment" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="Deployment"><!---->Deployment<!----></a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#ide-development" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="IDE Development"><!---->IDE Development<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#spark-shell-debugging" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="spark-shell Debugging"><!---->spark-shell Debugging<!----></a><ul class="sidebar-sub-headers"></ul></li></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#usage" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="Usage"><!---->Usage<!----></a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#parameters" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="Parameters"><!---->Parameters<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#reading-data-from-iotdb" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="Reading Data from IoTDB"><!---->Reading Data from IoTDB<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#writing-data-to-iotdb" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="Writing Data to IoTDB"><!---->Writing Data to IoTDB<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#wide-and-narrow-table-conversion" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="Wide and Narrow Table Conversion"><!---->Wide and Narrow Table Conversion<!----></a><ul class="sidebar-sub-headers"></ul></li></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#wide-and-narrow-tables" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="Wide and Narrow Tables"><!---->Wide and Narrow Tables<!----></a><ul class="sidebar-sub-headers"></ul></li></ul><!--]--></li><li><!--[--><a href="/UserGuide/Master/Ecosystem-Integration/Hive-TsFile.html" class="nav-link sidebar-link sidebar-page" aria-label="Hive-TsFile"><!---->Hive-TsFile<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/UserGuide/Master/Ecosystem-Integration/Flink-IoTDB.html" class="nav-link sidebar-link sidebar-page" aria-label="Flink-IoTDB"><!---->Flink-IoTDB<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/UserGuide/Master/Ecosystem-Integration/Flink-TsFile.html" class="nav-link sidebar-link sidebar-page" aria-label="Flink-TsFile"><!---->Flink-TsFile<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/UserGuide/Master/Ecosystem-Integration/NiFi-IoTDB.html" class="nav-link sidebar-link sidebar-page" aria-label="NiFi-IoTDB"><!---->NiFi-IoTDB<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li></ul></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Cluster</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">FAQ</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Reference</span><span class="arrow end"></span></button><!----></section></li></ul><!--[--><!----><!--]--></aside><!--[--><main class="page" id="main-content"><!--[--><!----><nav class="breadcrumb disable"></nav><div class="page-title"><h1><!---->Spark-IoTDB User Guide</h1><div class="page-info"><!----><!----><!----><!----><span class="page-reading-time-info" aria-label="Reading Time"><svg xmlns="http://www.w3.org/2000/svg" class="icon timer-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="timer icon"><path d="M799.387 122.15c4.402-2.978 7.38-7.897 7.38-13.463v-1.165c0-8.933-7.38-16.312-16.312-16.312H256.33c-8.933 0-16.311 7.38-16.311 16.312v1.165c0 5.825 2.977 10.874 7.637 13.592 4.143 194.44 97.22 354.963 220.201 392.763-122.204 37.542-214.893 196.511-220.2 389.397-4.661 5.049-7.638 11.651-7.638 19.03v5.825h566.49v-5.825c0-7.379-2.849-13.981-7.509-18.9-5.049-193.016-97.867-351.985-220.2-389.527 123.24-37.67 216.446-198.453 220.588-392.892zM531.16 450.445v352.632c117.674 1.553 211.787 40.778 211.787 88.676H304.097c0-48.286 95.149-87.382 213.728-88.676V450.445c-93.077-3.107-167.901-81.297-167.901-177.093 0-8.803 6.99-15.793 15.793-15.793 8.803 0 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 3 min</span><meta property="timeRequired" content="PT3M"></span><!----><!----></div><hr></div><div class="toc-place-holder"><aside id="toc"><!--[--><!----><!--]--><div class="toc-header">On This Page<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><div class="toc-wrapper"><ul class="toc-list"><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#supported-versions" class="router-link-active router-link-exact-active toc-link level2">Supported Versions</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#precautions" class="router-link-active router-link-exact-active toc-link level2">Precautions</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#deployment" class="router-link-active router-link-exact-active toc-link level2">Deployment</a></li><ul class="toc-list"><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#ide-development" class="router-link-active router-link-exact-active toc-link level3">IDE Development</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#spark-shell-debugging" class="router-link-active router-link-exact-active toc-link level3">spark-shell Debugging</a></li><!----><!--]--></ul><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#usage" class="router-link-active router-link-exact-active toc-link level2">Usage</a></li><ul class="toc-list"><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#parameters" class="router-link-active router-link-exact-active toc-link level3">Parameters</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#reading-data-from-iotdb" class="router-link-active router-link-exact-active toc-link level3">Reading Data from IoTDB</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#writing-data-to-iotdb" class="router-link-active router-link-exact-active toc-link level3">Writing Data to IoTDB</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#wide-and-narrow-table-conversion" class="router-link-active router-link-exact-active toc-link level3">Wide and Narrow Table Conversion</a></li><!----><!--]--></ul><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/Master/Ecosystem-Integration/Spark-IoTDB.html#wide-and-narrow-tables" class="router-link-active router-link-exact-active toc-link level2">Wide and Narrow Tables</a></li><!----><!--]--></ul></div><!--[--><!----><!--]--></aside></div><!----><div class="theme-hope-content"><!-- |
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| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
| "License"); you may not use this file except in compliance |
| with the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, |
| software distributed under the License is distributed on an |
| "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| KIND, either express or implied. See the License for the |
| specific language governing permissions and limitations |
| under the License. |
| |
| --><h1 id="spark-iotdb-user-guide" tabindex="-1"><a class="header-anchor" href="#spark-iotdb-user-guide" aria-hidden="true">#</a> Spark-IoTDB User Guide</h1><h2 id="supported-versions" tabindex="-1"><a class="header-anchor" href="#supported-versions" aria-hidden="true">#</a> Supported Versions</h2><p>Supported versions of Spark and Scala are as follows:</p><table><thead><tr><th>Spark Version</th><th>Scala Version</th></tr></thead><tbody><tr><td><code>2.4.0-latest</code></td><td><code>2.11, 2.12</code></td></tr></tbody></table><h2 id="precautions" tabindex="-1"><a class="header-anchor" href="#precautions" aria-hidden="true">#</a> Precautions</h2><ol><li>The current version of <code>spark-iotdb-connector</code> supports Scala <code>2.11</code> and <code>2.12</code>, but not <code>2.13</code>.</li><li><code>spark-iotdb-connector</code> supports usage in Spark for both Java, Scala, and PySpark.</li></ol><h2 id="deployment" tabindex="-1"><a class="header-anchor" href="#deployment" aria-hidden="true">#</a> Deployment</h2><p><code>spark-iotdb-connector</code> has two use cases: IDE development and <code>spark-shell</code> debugging.</p><h3 id="ide-development" tabindex="-1"><a class="header-anchor" href="#ide-development" aria-hidden="true">#</a> IDE Development</h3><p>For IDE development, simply add the following dependency to the <code>pom.xml</code> file:</p><div class="language-xml line-numbers-mode" data-ext="xml"><pre class="language-xml"><code> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dependency</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>groupId</span><span class="token punctuation">></span></span>org.apache.iotdb<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>groupId</span><span class="token punctuation">></span></span> |
| <span class="token comment"><!-- spark-iotdb-connector_2.11 or spark-iotdb-connector_2.13 --></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>artifactId</span><span class="token punctuation">></span></span>spark-iotdb-connector_2.12.10<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>artifactId</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>version</span><span class="token punctuation">></span></span>${iotdb.version}<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>version</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependency</span><span class="token punctuation">></span></span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="spark-shell-debugging" tabindex="-1"><a class="header-anchor" href="#spark-shell-debugging" aria-hidden="true">#</a> <code>spark-shell</code> Debugging</h3><p>To use <code>spark-iotdb-connector</code> in <code>spark-shell</code>, you need to download the <code>with-dependencies</code> version of the jar package from the official website. After that, copy the jar package to the <code>${SPARK_HOME}/jars</code> directory. Simply execute the following command:</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code><span class="token function">cp</span> spark-iotdb-connector_2.12.10-<span class="token variable">${iotdb.version}</span>.jar <span class="token variable">$SPARK_HOME</span>/jars/ |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="usage" tabindex="-1"><a class="header-anchor" href="#usage" aria-hidden="true">#</a> Usage</h2><h3 id="parameters" tabindex="-1"><a class="header-anchor" href="#parameters" aria-hidden="true">#</a> Parameters</h3><table><thead><tr><th>Parameter</th><th>Description</th><th>Default Value</th><th>Scope</th><th>Can be Empty</th></tr></thead><tbody><tr><td>url</td><td>Specifies the JDBC URL of IoTDB</td><td>null</td><td>read, write</td><td>false</td></tr><tr><td>user</td><td>The username of IoTDB</td><td>root</td><td>read, write</td><td>true</td></tr><tr><td>password</td><td>The password of IoTDB</td><td>root</td><td>read, write</td><td>true</td></tr><tr><td>sql</td><td>Specifies the SQL statement for querying</td><td>null</td><td>read</td><td>true</td></tr><tr><td>numPartition</td><td>Specifies the partition number of the DataFrame when in read, and the write concurrency number when in write</td><td>1</td><td>read, write</td><td>true</td></tr><tr><td>lowerBound</td><td>The start timestamp of the query (inclusive)</td><td>0</td><td>read</td><td>true</td></tr><tr><td>upperBound</td><td>The end timestamp of the query (inclusive)</td><td>0</td><td>read</td><td>true</td></tr></tbody></table><h3 id="reading-data-from-iotdb" tabindex="-1"><a class="header-anchor" href="#reading-data-from-iotdb" aria-hidden="true">#</a> Reading Data from IoTDB</h3><p>Here is an example that demonstrates how to read data from IoTDB into a DataFrame:</p><div class="language-scala line-numbers-mode" data-ext="scala"><pre class="language-scala"><code><span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>spark<span class="token punctuation">.</span>db<span class="token punctuation">.</span></span>_ |
| |
| <span class="token keyword">val</span> df <span class="token operator">=</span> spark<span class="token punctuation">.</span>read<span class="token punctuation">.</span>format<span class="token punctuation">(</span><span class="token string">"org.apache.iotdb.spark.db"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>option<span class="token punctuation">(</span><span class="token string">"user"</span><span class="token punctuation">,</span> <span class="token string">"root"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>option<span class="token punctuation">(</span><span class="token string">"password"</span><span class="token punctuation">,</span> <span class="token string">"root"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>option<span class="token punctuation">(</span><span class="token string">"url"</span><span class="token punctuation">,</span> <span class="token string">"jdbc:iotdb://127.0.0.1:6667/"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>option<span class="token punctuation">(</span><span class="token string">"sql"</span><span class="token punctuation">,</span> <span class="token string">"select ** from root"</span><span class="token punctuation">)</span> <span class="token comment">// query SQL</span> |
| <span class="token punctuation">.</span>option<span class="token punctuation">(</span><span class="token string">"lowerBound"</span><span class="token punctuation">,</span> <span class="token string">"0"</span><span class="token punctuation">)</span> <span class="token comment">// lower timestamp bound</span> |
| <span class="token punctuation">.</span>option<span class="token punctuation">(</span><span class="token string">"upperBound"</span><span class="token punctuation">,</span> <span class="token string">"100000000"</span><span class="token punctuation">)</span> <span class="token comment">// upper timestamp bound</span> |
| <span class="token punctuation">.</span>option<span class="token punctuation">(</span><span class="token string">"numPartition"</span><span class="token punctuation">,</span> <span class="token string">"5"</span><span class="token punctuation">)</span> <span class="token comment">// number of partitions</span> |
| <span class="token punctuation">.</span>load |
| |
| df<span class="token punctuation">.</span>printSchema<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| |
| df<span class="token punctuation">.</span>show<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="writing-data-to-iotdb" tabindex="-1"><a class="header-anchor" href="#writing-data-to-iotdb" aria-hidden="true">#</a> Writing Data to IoTDB</h3><p>Here is an example that demonstrates how to write data to IoTDB:</p><div class="language-scala line-numbers-mode" data-ext="scala"><pre class="language-scala"><code><span class="token comment">// Construct narrow table data</span> |
| <span class="token keyword">val</span> df <span class="token operator">=</span> spark<span class="token punctuation">.</span>createDataFrame<span class="token punctuation">(</span>List<span class="token punctuation">(</span> |
| <span class="token punctuation">(</span><span class="token number">1L</span><span class="token punctuation">,</span> <span class="token string">"root.test.d0"</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">1L</span><span class="token punctuation">,</span> <span class="token number">1.0F</span><span class="token punctuation">,</span> <span class="token number">1.0D</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">,</span> <span class="token string">"hello"</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| <span class="token punctuation">(</span><span class="token number">2L</span><span class="token punctuation">,</span> <span class="token string">"root.test.d0"</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">2L</span><span class="token punctuation">,</span> <span class="token number">2.0F</span><span class="token punctuation">,</span> <span class="token number">2.0D</span><span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token string">"world"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> |
| |
| <span class="token keyword">val</span> dfWithColumn <span class="token operator">=</span> df<span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_1"</span><span class="token punctuation">,</span> <span class="token string">"Time"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_2"</span><span class="token punctuation">,</span> <span class="token string">"Device"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_3"</span><span class="token punctuation">,</span> <span class="token string">"s0"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_4"</span><span class="token punctuation">,</span> <span class="token string">"s1"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_5"</span><span class="token punctuation">,</span> <span class="token string">"s2"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_6"</span><span class="token punctuation">,</span> <span class="token string">"s3"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_7"</span><span class="token punctuation">,</span> <span class="token string">"s4"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_8"</span><span class="token punctuation">,</span> <span class="token string">"s5"</span><span class="token punctuation">)</span> |
| |
| <span class="token comment">// Write narrow table data</span> |
| dfWithColumn |
| <span class="token punctuation">.</span>write |
| <span class="token punctuation">.</span>format<span class="token punctuation">(</span><span class="token string">"org.apache.iotdb.spark.db"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>option<span class="token punctuation">(</span><span class="token string">"url"</span><span class="token punctuation">,</span> <span class="token string">"jdbc:iotdb://127.0.0.1:6667/"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>save |
| |
| <span class="token comment">// Construct wide table data</span> |
| <span class="token keyword">val</span> df <span class="token operator">=</span> spark<span class="token punctuation">.</span>createDataFrame<span class="token punctuation">(</span>List<span class="token punctuation">(</span> |
| <span class="token punctuation">(</span><span class="token number">1L</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">1L</span><span class="token punctuation">,</span> <span class="token number">1.0F</span><span class="token punctuation">,</span> <span class="token number">1.0D</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">,</span> <span class="token string">"hello"</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| <span class="token punctuation">(</span><span class="token number">2L</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">2L</span><span class="token punctuation">,</span> <span class="token number">2.0F</span><span class="token punctuation">,</span> <span class="token number">2.0D</span><span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token string">"world"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> |
| |
| <span class="token keyword">val</span> dfWithColumn <span class="token operator">=</span> df<span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_1"</span><span class="token punctuation">,</span> <span class="token string">"Time"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_2"</span><span class="token punctuation">,</span> <span class="token string">"root.test.d0.s0"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_3"</span><span class="token punctuation">,</span> <span class="token string">"root.test.d0.s1"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_4"</span><span class="token punctuation">,</span> <span class="token string">"root.test.d0.s2"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_5"</span><span class="token punctuation">,</span> <span class="token string">"root.test.d0.s3"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_6"</span><span class="token punctuation">,</span> <span class="token string">"root.test.d0.s4"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>withColumnRenamed<span class="token punctuation">(</span><span class="token string">"_7"</span><span class="token punctuation">,</span> <span class="token string">"root.test.d0.s5"</span><span class="token punctuation">)</span> |
| |
| <span class="token comment">// Write wide table data</span> |
| dfWithColumn<span class="token punctuation">.</span>write<span class="token punctuation">.</span>format<span class="token punctuation">(</span><span class="token string">"org.apache.iotdb.spark.db"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>option<span class="token punctuation">(</span><span class="token string">"url"</span><span class="token punctuation">,</span> <span class="token string">"jdbc:iotdb://127.0.0.1:6667/"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>option<span class="token punctuation">(</span><span class="token string">"numPartition"</span><span class="token punctuation">,</span> <span class="token string">"10"</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span>save |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="wide-and-narrow-table-conversion" tabindex="-1"><a class="header-anchor" href="#wide-and-narrow-table-conversion" aria-hidden="true">#</a> Wide and Narrow Table Conversion</h3><p>Here are examples of how to convert between wide and narrow tables:</p><ul><li>From wide to narrow</li></ul><div class="language-scala line-numbers-mode" data-ext="scala"><pre class="language-scala"><code><span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>spark<span class="token punctuation">.</span>db<span class="token punctuation">.</span></span>_ |
| |
| <span class="token keyword">val</span> wide_df <span class="token operator">=</span> spark<span class="token punctuation">.</span>read<span class="token punctuation">.</span>format<span class="token punctuation">(</span><span class="token string">"org.apache.iotdb.spark.db"</span><span class="token punctuation">)</span><span class="token punctuation">.</span>option<span class="token punctuation">(</span><span class="token string">"url"</span><span class="token punctuation">,</span> <span class="token string">"jdbc:iotdb://127.0.0.1:6667/"</span><span class="token punctuation">)</span><span class="token punctuation">.</span>option<span class="token punctuation">(</span><span class="token string">"sql"</span><span class="token punctuation">,</span> <span class="token string">"select * from root.** where time < 1100 and time > 1000"</span><span class="token punctuation">)</span><span class="token punctuation">.</span>load |
| <span class="token keyword">val</span> narrow_df <span class="token operator">=</span> Transformer<span class="token punctuation">.</span>toNarrowForm<span class="token punctuation">(</span>spark<span class="token punctuation">,</span> wide_df<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>From narrow to wide</li></ul><div class="language-scala line-numbers-mode" data-ext="scala"><pre class="language-scala"><code><span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>spark<span class="token punctuation">.</span>db<span class="token punctuation">.</span></span>_ |
| |
| <span class="token keyword">val</span> wide_df <span class="token operator">=</span> Transformer<span class="token punctuation">.</span>toWideForm<span class="token punctuation">(</span>spark<span class="token punctuation">,</span> narrow_df<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="wide-and-narrow-tables" tabindex="-1"><a class="header-anchor" href="#wide-and-narrow-tables" aria-hidden="true">#</a> Wide and Narrow Tables</h2><p>Using the TsFile structure as an example: there are three measurements in the TsFile pattern, namely <code>Status</code>, <code>Temperature</code>, and <code>Hardware</code>. The basic information for each of these three measurements is as follows:</p><table><thead><tr><th>Name</th><th>Type</th><th>Encoding</th></tr></thead><tbody><tr><td>Status</td><td>Boolean</td><td>PLAIN</td></tr><tr><td>Temperature</td><td>Float</td><td>RLE</td></tr><tr><td>Hardware</td><td>Text</td><td>PLAIN</td></tr></tbody></table><p>The existing data in the TsFile is as follows:</p><ul><li><code>d1:root.ln.wf01.wt01</code></li><li><code>d2:root.ln.wf02.wt02</code></li></ul><table><thead><tr><th>time</th><th>d1.status</th><th>time</th><th>d1.temperature</th><th>time</th><th>d2.hardware</th><th>time</th><th>d2.status</th></tr></thead><tbody><tr><td>1</td><td>True</td><td>1</td><td>2.2</td><td>2</td><td>"aaa"</td><td>1</td><td>True</td></tr><tr><td>3</td><td>True</td><td>2</td><td>2.2</td><td>4</td><td>"bbb"</td><td>2</td><td>False</td></tr><tr><td>5</td><td>False</td><td>3</td><td>2.1</td><td>6</td><td>"ccc"</td><td>4</td><td>True</td></tr></tbody></table><p>The wide (default) table form is as follows:</p><table><thead><tr><th>Time</th><th>root.ln.wf02.wt02.temperature</th><th>root.ln.wf02.wt02.status</th><th>root.ln.wf02.wt02.hardware</th><th>root.ln.wf01.wt01.temperature</th><th>root.ln.wf01.wt01.status</th><th>root.ln.wf01.wt01.hardware</th></tr></thead><tbody><tr><td>1</td><td>null</td><td>true</td><td>null</td><td>2.2</td><td>true</td><td>null</td></tr><tr><td>2</td><td>null</td><td>false</td><td>aaa</td><td>2.2</td><td>null</td><td>null</td></tr><tr><td>3</td><td>null</td><td>null</td><td>null</td><td>2.1</td><td>true</td><td>null</td></tr><tr><td>4</td><td>null</td><td>true</td><td>bbb</td><td>null</td><td>null</td><td>null</td></tr><tr><td>5</td><td>null</td><td>null</td><td>null</td><td>null</td><td>false</td><td>null</td></tr><tr><td>6</td><td>null</td><td>null</td><td>ccc</td><td>null</td><td>null</td><td>null</td></tr></tbody></table><p>You can also use the narrow table format as shown below:</p><table><thead><tr><th>Time</th><th>Device</th><th>status</th><th>hardware</th><th>temperature</th></tr></thead><tbody><tr><td>1</td><td>root.ln.wf02.wt01</td><td>true</td><td>null</td><td>2.2</td></tr><tr><td>1</td><td>root.ln.wf02.wt02</td><td>true</td><td>null</td><td>null</td></tr><tr><td>2</td><td>root.ln.wf02.wt01</td><td>null</td><td>null</td><td>2.2</td></tr><tr><td>2</td><td>root.ln.wf02.wt02</td><td>false</td><td>aaa</td><td>null</td></tr><tr><td>3</td><td>root.ln.wf02.wt01</td><td>true</td><td>null</td><td>2.1</td></tr><tr><td>4</td><td>root.ln.wf02.wt02</td><td>true</td><td>bbb</td><td>null</td></tr><tr><td>5</td><td>root.ln.wf02.wt01</td><td>false</td><td>null</td><td>null</td></tr><tr><td>6</td><td>root.ln.wf02.wt02</td><td>null</td><td>ccc</td><td>null</td></tr></tbody></table></div><!----><footer class="page-meta"><div class="meta-item edit-link"><a href="https://github.com/apache/iotdb/edit/master/docs/UserGuide/Ecosystem-Integration/Spark-IoTDB.md" rel="noopener noreferrer" target="_blank" aria-label="Found Error? 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