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Policy</a></li></ul></nav></div></aside><main class="docMainContainer_Q970"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_zHA2"><div class="docItemContainer_oiyr"><article><span class="theme-doc-version-badge badge badge--secondary">Version: <!-- -->0.14.1</span><div class="tocCollapsible_aw-L theme-doc-toc-mobile tocMobile_Tx6Y"><button type="button" class="clean-btn tocCollapsibleButton_zr6a">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Transformers</h1></header><p>Apache Hudi provides a HoodieTransformer Utility that allows you to perform transformations the source data before writing it to a Hudi table. |
| There are several <a href="https://github.com/apache/hudi/tree/master/hudi-utilities/src/main/java/org/apache/hudi/utilities/transform" target="_blank" rel="noopener noreferrer">out-of-the-box</a> |
| transformers available and you can build your own custom transformer class as well.</p><h3 class="anchor anchorWithStickyNavbar_y2LR" id="sql-query-transformer">SQL Query Transformer<a class="hash-link" href="#sql-query-transformer" title="Direct link to heading"></a></h3><p>You can pass a SQL Query to be executed during write.</p><div class="codeBlockContainer_J+bg language-scala theme-code-block"><div class="codeBlockContent_csEI scala"><pre tabindex="0" class="prism-code language-scala codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><span class="token plain">--transformer-class org.apache.hudi.utilities.transform.SqlQueryBasedTransformer</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--hoodie-conf hoodie.streamer.transformer.sql=SELECT a.col1, a.col3, a.col4 FROM <SRC> a</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><h3 class="anchor anchorWithStickyNavbar_y2LR" id="sql-file-transformer">SQL File Transformer<a class="hash-link" href="#sql-file-transformer" title="Direct link to heading"></a></h3><p>You can specify a File with a SQL script to be executed during write. The SQL file is configured with this hoodie property: |
| hoodie.streamer.transformer.sql.file</p><p>The query should reference the source as a table named "\<SRC<!-- -->><!-- -->"</p><p>The final sql statement result is used as the write payload.</p><p>Example Spark SQL Query:</p><div class="codeBlockContainer_J+bg language-sql theme-code-block"><div class="codeBlockContent_csEI sql"><pre tabindex="0" class="prism-code language-sql codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><span class="token plain">CACHE </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">TABLE</span><span class="token plain"> tmp_personal_trips </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">AS</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">SELECT</span><span class="token plain"> </span><span class="token operator">*</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">FROM</span><span class="token plain"> </span><span class="token operator"><</span><span class="token plain">SRC</span><span class="token operator">></span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">WHERE</span><span class="token plain"> trip_type</span><span class="token operator">=</span><span class="token string" style="color:rgb(255, 121, 198)">'personal_trips'</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">SELECT</span><span class="token plain"> </span><span class="token operator">*</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">FROM</span><span class="token plain"> tmp_personal_trips</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><h3 class="anchor anchorWithStickyNavbar_y2LR" id="flattening-transformer">Flattening Transformer<a class="hash-link" href="#flattening-transformer" title="Direct link to heading"></a></h3><p>This transformer can flatten nested objects. It flattens the nested fields in the incoming records by prefixing |
| inner-fields with outer-field and _ in a nested fashion. Currently flattening of arrays is not supported.</p><p>An example schema may look something like the below where name is a nested field of StructType in the original source</p><div class="codeBlockContainer_J+bg language-scala theme-code-block"><div class="codeBlockContent_csEI scala"><pre tabindex="0" class="prism-code language-scala codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><span class="token plain">age as intColumn,address as stringColumn,name.first as name_first,name.last as name_last, name.middle as name_middle</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>Set the config as:</p><div class="codeBlockContainer_J+bg language-scala theme-code-block"><div class="codeBlockContent_csEI scala"><pre tabindex="0" class="prism-code language-scala codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><span class="token plain">--transformer-class org.apache.hudi.utilities.transform.FlatteningTransformer</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><h3 class="anchor anchorWithStickyNavbar_y2LR" id="chained-transformer">Chained Transformer<a class="hash-link" href="#chained-transformer" title="Direct link to heading"></a></h3><p>If you wish to use multiple transformers together, you can use the Chained transformers to pass multiple to be executed sequentially.</p><p>Example below first flattens the incoming records and then does sql projection based on the query specified:</p><div class="codeBlockContainer_J+bg language-scala theme-code-block"><div class="codeBlockContent_csEI scala"><pre tabindex="0" class="prism-code language-scala codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><span class="token plain">--transformer-class org.apache.hudi.utilities.transform.FlatteningTransformer,org.apache.hudi.utilities.transform.SqlQueryBasedTransformer </span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--hoodie-conf hoodie.streamer.transformer.sql=SELECT a.col1, a.col3, a.col4 FROM <SRC> a</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><h3 class="anchor anchorWithStickyNavbar_y2LR" id="aws-dms-transformer">AWS DMS Transformer<a class="hash-link" href="#aws-dms-transformer" title="Direct link to heading"></a></h3><p>This transformer is specific for AWS DMS data. It adds <code>Op</code> field with value <code>I</code> if the field is not present.</p><p>Set the config as:</p><div class="codeBlockContainer_J+bg language-scala theme-code-block"><div class="codeBlockContent_csEI scala"><pre tabindex="0" class="prism-code language-scala codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><span class="token plain">--transformer-class org.apache.hudi.utilities.transform.AWSDmsTransformer</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><h3 class="anchor anchorWithStickyNavbar_y2LR" id="custom-transformer-implementation">Custom Transformer Implementation<a class="hash-link" href="#custom-transformer-implementation" title="Direct link to heading"></a></h3><p>You can write your own custom transformer by extending <a href="https://github.com/apache/hudi/tree/master/hudi-utilities/src/main/java/org/apache/hudi/utilities/transform" target="_blank" rel="noopener noreferrer">this class</a></p><h2 class="anchor anchorWithStickyNavbar_y2LR" id="related-resources">Related Resources<a class="hash-link" href="#related-resources" title="Direct link to heading"></a></h2><h3>Videos</h3><ul><li><a href="https://www.youtube.com/watch?v=AprlZ8hGdJo" target="_blank" rel="noopener noreferrer">Learn about Apache Hudi Transformers with Hands on Lab</a></li><li><a href="https://youtu.be/DH3LEaPG6ss" target="_blank" rel="noopener noreferrer">Apache Hudi with DBT Hands on Lab.Transform Raw Hudi tables with DBT and Glue Interactive Session</a></li></ul></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/apache/hudi/tree/asf-site/website/versioned_docs/version-0.14.1/transforms.md" target="_blank" rel="noreferrer noopener" 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