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class="nav-toggle"></button> <a href="../../index.html" class="home-link"></a> <nav class="breadcrumbs" aria-label="breadcrumbs"> <ul> <li><a href="../../index.html">User manual</a></li> <li><a href="../plugins.html">Plugins</a></li> <li><a href="../transforms.html">Transform Plugins</a></li> <li><a href="mergerows.html">Merge rows (diff)</a></li> </ul> </nav> <div class="edit-this-page"><a href="https://github.com/apache/incubator-hop/edit/master/plugins/transforms/mergerows/src/main/doc/mergerows.adoc">Edit this Page</a></div> </div> <article class="doc"> <h1 class="page">Merge rows (diff)</h1> <div class="sect1"> <h2 id="_description"><a class="anchor" href="#_description"></a>Description</h2> <div class="sectionbody"> <div class="paragraph"> <p>The Merge rows (diff) transform compares and merges data within two rows of data. This transform is useful for comparing data collected at two different times. For example, the source system of your data warehouse might not contain a timestamp of the last data update. You could use this transform to compare the two data streams and and merge the dates and timestamps in the rows.</p> </div> <div class="paragraph"> <p>Based on keys for comparison, this transform merges reference rows (previous data) with compare rows (new data) and creates merged output rows. A flag in the row indicates how the values were compared and merged. Flag values include:</p> </div> <div class="ulist"> <ul> <li> <p><strong>identical</strong>: The key was found in both rows, and the compared values are identical.</p> </li> <li> <p><strong>changed</strong>: The key was found in both rows, but one or more compared values are different.</p> </li> <li> <p><strong>new</strong>: The key was not found in the reference rows.</p> </li> <li> <p><strong>deleted</strong>: The key was not found in the compare rows.</p> </li> </ul> </div> <div class="paragraph"> <p>If the row’s flag is <strong>identical</strong> or <strong>deleted</strong>, the merged output rows are based on the reference rows.</p> </div> <div class="paragraph"> <p>For <strong>new</strong> or <strong>changed</strong> rows, the merged output rows are based on the compare rows.</p> </div> <div class="paragraph"> <p>You can also send values from the merged and flagged rows to a subsequent transform in your pipeline, such as the Switch-Case transform or the Synchronize after merge transform. In the subsequent transform, you can use the flag field generated by <strong>Merge rows (diff)</strong> to control updates/inserts/deletes on a target table.</p> </div> </div> </div> <div class="sect1"> <h2 id="_options"><a class="anchor" href="#_options"></a>Options</h2> <div class="sectionbody"> <div class="table-wrapper"><table class="tableblock frame-all grid-all"> <colgroup> <col> <col> </colgroup> <thead> <tr> <th class="tableblock halign-left valign-top">Option</th> <th class="tableblock halign-left valign-top">Description</th> </tr> </thead> <tbody> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Transform name</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Name of the transform.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Reference rows origin</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Specify the transform origin for the reference rows ← Stream with original rows, or rows you want to compare the new rows to.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Compare rows origin</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Specify the transform origin for the compare rows.← Stream with new rows</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Flag fieldname</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Specify the name of the flag field on the output stream.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Keys to match</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Specify fields containing the keys on which to match;click Get key fields to insert all of the fields originating from the reference rows transform</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Values to compare</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Specify fields contaning the values to compare; click Get value fields to insert all of the fields from the originating value rows transform. Key fields do not need to be specified here.</p></td> </tr> </tbody> </table></div> </div> </div> <div class="sect1"> <h2 id="_metadata_injection_support"><a class="anchor" href="#_metadata_injection_support"></a>Metadata Injection Support</h2> <div class="sectionbody"> <div class="paragraph"> <p>All fields of this transform support metadata injection. You can use this transform with ETL Metadata Injection to pass metadata to your pipeline at runtime.</p> </div> </div> </div> </article> </main> </div> <footer> <div class="footer"> <dl> <dt>Overview</dt> <dd><a href="../../../../download/">Download</a></dd> <dd><a href="../../../../manual/latest/">Getting started</a></dd> </dl> <dl> <dt>Community</dt> <dd><a target="_blank" href="https://issues.apache.org/jira/projects/HOP/issues">Jira</a></dd> <dd><a target="_blank" href="https://chat.project-hop.org">Chat</a></dd> <dd><a target="_blank" href="../../../../community/team/">Team</a></dd> </dl> <dl> <dt>About</dt> <dd><a target="_blank" href="https://www.apache.org/licenses/" title="License">License</a></dd> </dl> <p> © 2019-2021 The Hop Team.<br> All marks mentioned may be trademarks or registered trademarks of their respective owners. </p> </div> </footer> <script src="../../../../_/js/site-8ed57175ed.js"></script> <script async src="../../../../_/js/vendor/highlight-41b831b4c4.js"></script> <script src="../../../../_/js/vendor/cookies-eu-banner-d4a1518c50.js"></script> <script> new CookiesEuBanner(function () { |
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