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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" name="print"><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="#supported-versions">Supported Versions</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#precautions">Precautions</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#deployment">Deployment</a></li><li><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#ide-development">IDE Development</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#spark-shell-debugging">spark-shell Debugging</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#usage">Usage</a></li><li><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#parameters">Parameters</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#reading-data-from-iotdb">Reading Data from IoTDB</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#writing-data-to-iotdb">Writing Data to IoTDB</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#wide-and-narrow-table-conversion">Wide and Narrow Table Conversion</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#wide-and-narrow-tables">Wide and Narrow Tables</a></li><!----><!--]--></ul><div class="vp-toc-marker" style="top:-1.7rem;"></div></div><!----></aside></div><!----><div class="theme-hope-content"><h1 id="apache-spark-iotdb" tabindex="-1"><a class="header-anchor" href="#apache-spark-iotdb"><span>Apache Spark(IoTDB)</span></a></h1><h2 id="supported-versions" tabindex="-1"><a class="header-anchor" href="#supported-versions"><span>Supported Versions</span></a></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"><span>Precautions</span></a></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"><span>Deployment</span></a></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"><span>IDE Development</span></a></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-highlighter="prismjs" data-ext="xml" data-title="xml"><pre><code><span class="line"> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dependency</span><span class="token punctuation">></span></span></span> |
| <span class="line"> <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> |
| <span class="line"> <span class="token comment"><!-- spark-iotdb-connector_2.11 or spark-iotdb-connector_2.13 --></span></span> |
| <span class="line"> <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> |
| <span class="line"> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>version</span><span class="token punctuation">></span></span>${iotdb.version}<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>version</span><span class="token punctuation">></span></span></span> |
| <span class="line"> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependency</span><span class="token punctuation">></span></span></span> |
| <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="spark-shell-debugging" tabindex="-1"><a class="header-anchor" href="#spark-shell-debugging"><span><code>spark-shell</code> Debugging</span></a></h3><p>To use <code>spark-iotdb-connector</code> in <code>spark-shell</code>, you need to download the <code>with-dependencies</code> version of the jar package<br> from the official website. After that, copy the jar package to the <code>${SPARK_HOME}/jars</code> directory.<br> Simply execute the following command:</p><div class="language-bash line-numbers-mode" data-highlighter="prismjs" data-ext="sh" data-title="sh"><pre><code><span class="line"><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/</span> |
| <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p>In addition, to ensure that spark can use JDBC and IoTDB connections, you need to do the following:</p><p>Run the following command to compile the IoTDB JDBC connector:</p><div class="language-bash line-numbers-mode" data-highlighter="prismjs" data-ext="sh" data-title="sh"><pre><code><span class="line">mvn clean package <span class="token parameter variable">-pl</span> iotdb-client/jdbc <span class="token parameter variable">-am</span> <span class="token parameter variable">-DskipTests</span> <span class="token parameter variable">-P</span> get-jar-with-dependencies</span> |
| <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p>The compiled jar package is located in the following directory:</p><div class="language-bash line-numbers-mode" data-highlighter="prismjs" data-ext="sh" data-title="sh"><pre><code><span class="line"><span class="token variable">$IoTDB_HOME</span>/iotdb-client/jdbc/target/iotdb-jdbc-<span class="token punctuation">{</span>version<span class="token punctuation">}</span>-SNAPSHOT-jar-with-dependencies.jar</span> |
| <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p>At last, copy the jar package to the ${SPARK_HOME}/jars directory. Simply execute the following command:</p><div class="language-bash line-numbers-mode" data-highlighter="prismjs" data-ext="sh" data-title="sh"><pre><code><span class="line"><span class="token function">cp</span> iotdb-jdbc-<span class="token punctuation">{</span>version<span class="token punctuation">}</span>-SNAPSHOT-jar-with-dependencies.jar <span class="token variable">$SPARK_HOME</span>/jars/</span> |
| <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><h2 id="usage" tabindex="-1"><a class="header-anchor" href="#usage"><span>Usage</span></a></h2><h3 id="parameters" tabindex="-1"><a class="header-anchor" href="#parameters"><span>Parameters</span></a></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"><span>Reading Data from IoTDB</span></a></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-highlighter="prismjs" data-ext="scala" data-title="scala"><pre><code><span class="line"><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> |
| <span class="line"></span> |
| <span class="line"><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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <span class="token punctuation">.</span>load</span> |
| <span class="line"></span> |
| <span class="line">df<span class="token punctuation">.</span>printSchema<span class="token punctuation">(</span><span class="token punctuation">)</span></span> |
| <span class="line"></span> |
| <span class="line">df<span class="token punctuation">.</span>show<span class="token punctuation">(</span><span class="token punctuation">)</span></span> |
| <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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"><span>Writing Data to IoTDB</span></a></h3><p>Here is an example that demonstrates how to write data to IoTDB:</p><div class="language-scala line-numbers-mode" data-highlighter="prismjs" data-ext="scala" data-title="scala"><pre><code><span class="line"><span class="token comment">// Construct narrow table data</span></span> |
| <span class="line"><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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"></span> |
| <span class="line"><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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"></span> |
| <span class="line"><span class="token comment">// Write narrow table data</span></span> |
| <span class="line">dfWithColumn</span> |
| <span class="line"> <span class="token punctuation">.</span>write</span> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <span class="token punctuation">.</span>save</span> |
| <span class="line"></span> |
| <span class="line"><span class="token comment">// Construct wide table data</span></span> |
| <span class="line"><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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"></span> |
| <span class="line"><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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"></span> |
| <span class="line"><span class="token comment">// Write wide table data</span></span> |
| <span class="line">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> |
| <span class="line"> <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> |
| <span class="line"> <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> |
| <span class="line"> <span class="token punctuation">.</span>save</span> |
| <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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"><span>Wide and Narrow Table Conversion</span></a></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-highlighter="prismjs" data-ext="scala" data-title="scala"><pre><code><span class="line"><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> |
| <span class="line"></span> |
| <span class="line"><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> |
| <span class="line"><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></span> |
| <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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-highlighter="prismjs" data-ext="scala" data-title="scala"><pre><code><span class="line"><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> |
| <span class="line"></span> |
| <span class="line"><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></span> |
| <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><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"><span>Wide and Narrow Tables</span></a></h2><p>Using the TsFile structure as an example: there are three measurements in the TsFile pattern,<br> namely <code>Status</code>, <code>Temperature</code>, and <code>Hardware</code>. The basic information for each of these three measurements is as<br> 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="vp-page-meta"><div class="vp-meta-item edit-link"><a class="auto-link external-link vp-meta-label" href="https://github.com/apache/iotdb-docs/edit/main/src/UserGuide/latest/Ecosystem-Integration/Spark-IoTDB.md" aria-label="Found Error? 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