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aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/category/features"><span itemprop="name">Features</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Logical Models</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: Next</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Logical Models</h1><div class="theme-admonition theme-admonition-note alert alert--secondary admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>Supported Entity Types</div><div class="admonitionContent_S0QG"><p>Currently we only support datasets and by extension schema fields for logical models. No other entity types are supported.</p></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="what-is-a-logical-model">What is a Logical Model<a href="#what-is-a-logical-model" class="hash-link" aria-label="Direct link to What is a Logical Model" title="Direct link to What is a Logical Model"></a></h2><p>A logical model represents the concept and structure of a database table, without being tied to any single physical instantiation in some source system. Like any DataHub dataset entity, a logical model describes its columns, including data types and descriptions, and can be attributed with other metadata like tags, terms, owners, and custom properties. But unlike physical datasets, logical models do not represent a table in a source system that actually exists, in which data is stored and can be queried.</p><p>Logical models are useful for those who have multiple tables that represent the same type or shap of data, or store the same data. This is common for multi-cloud data ecosystems, in which the same table may be replicated across several cloud providers, e.g. Snowflake, Redshift, and BigQuery. It is also useful in cases where multiple replicas exist in a single system, such as gold/silver/bronze layers. Logical models should be linked to each physical representation to expose this relationship DataHub. DataHub Cloud customers can take advantage further with <a href="/docs/features/feature-guides/logical-models/centralized-management">Centralized Management</a>, in which every physical child's metadata can be managed at the logical model level.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="how-it-looks">How It Looks<a href="#how-it-looks" class="hash-link" aria-label="Direct link to How It Looks" title="Direct link to How It Looks"></a></h2><div class="theme-admonition theme-admonition-note alert alert--secondary admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>Feature Flag</div><div class="admonitionContent_S0QG"><p>The environment variable <code>LOGICAL_MODELS_ENABLED</code> must be set to <code>true</code> on <code>datahub-gms</code> for logical models to be viewed in the UI.</p></div></div><p>For example, suppose there exists a <code>Users</code> table Snowflake, an <code>AllUsers</code> table in BigQuery, and a <code>UsersAttributes</code> table Apache Hive. These three tables may have different names and slightly different structures, but logically represent the same data: a table of users, with certain information (columns) for each user. We create a logical table called <code>Users</code> and link it to each physical child:</p><p style="display:flex;flex-direction:row;justify-content:center;gap:60px"><img loading="lazy" width="40%" src="https://raw.githubusercontent.com/datahub-project/static-assets/main/imgs/logical/relationship-diagram.png" class="img_ev3q"></p><p>Once the relationships are <a href="#creating-logical-models">created</a>, they will show up in the entity sidebar for both logical parents and their physical children:</p><p style="display:flex;flex-direction:row;justify-content:center;gap:60px"><img loading="lazy" width="40%" src="https://raw.githubusercontent.com/datahub-project/static-assets/main/imgs/logical/logical-parent.png" class="img_ev3q"><img loading="lazy" width="40%" src="https://raw.githubusercontent.com/datahub-project/static-assets/main/imgs/logical/physical-child.png" class="img_ev3q"></p><p>Columns on the logical parent and physical children can be linked as well:</p><p style="display:flex;flex-direction:row;justify-content:center;gap:60px"><img loading="lazy" width="40%" src="https://raw.githubusercontent.com/datahub-project/static-assets/main/imgs/logical/logical-parent-column.png" class="img_ev3q"><img loading="lazy" width="40%" src="https://raw.githubusercontent.com/datahub-project/static-assets/main/imgs/logical/physical-child-column.png" class="img_ev3q"></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="creating-logical-models">Creating Logical Models<a href="#creating-logical-models" class="hash-link" aria-label="Direct link to Creating Logical Models" title="Direct link to Creating Logical Models"></a></h2><p>Logical models are created like any DataHub dataset. We recommend using the Python SDK.</p><div class="theme-admonition theme-admonition-note alert alert--secondary admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>Logical Model Platform</div><div class="admonitionContent_S0QG"><p>All DataHub datasets require a platform, representing where the dataset exists. If your logical models are stored in a system users are familiar with, we recommend creating a custom platform for that system and providing a custom icon. Otherwise, we recommend using the platform <code>logical</code>, which has a special default icon.</p></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="create-dataset-in-logical-platform">Create Dataset in "logical" Platform<a href="#create-dataset-in-logical-platform" class="hash-link" aria-label="Direct link to Create Dataset in "logical" Platform" title="Direct link to Create Dataset in "logical" Platform"></a></h3><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">sdk </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> DataHubClient</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> Dataset</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> client </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> DataHubClient</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">from_env</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> dataset </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> Dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> platform</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"logical"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> name</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">logical_model_name</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> description</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">logical_model_description</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> schema</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># tuples of (field name / field path, data type, description)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"zipcode"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"varchar(50)"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"This is the zipcode of the address. Specified using extended form and limited to addresses in the United States"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"street"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"varchar(100)"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"Street corresponding to the address"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"date_column"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"date"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"Date of the last sale date for this property"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> client</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">entities</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">upsert</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="create-dataset-in-custom-platform">Create Dataset in Custom Platform<a href="#create-dataset-in-custom-platform" class="hash-link" aria-label="Direct link to Create Dataset in Custom Platform" title="Direct link to Create Dataset in Custom Platform"></a></h3><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Create custom platform with custom logo</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">sdk </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> DataHubClient</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">emitter</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">mcp </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> MetadataChangeProposalWrapper</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">metadata</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">schema_classes </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> DataPlatformInfoClass</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> PlatformTypeClass</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">metadata</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">urns </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> DataPlatformUrn</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> urn </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> DataPlatformUrn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"<platformName>"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> aspect </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> DataPlatformInfoClass</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> name</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"<platformName>"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">type</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">PlatformTypeClass</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">OTHERS</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> datasetNameDelimiter</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"."</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> logoUrl</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"<url>"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> client </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> DataHubClient</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">from_env</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> client</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">_graph</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">emit</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">MetadataChangeProposalWrapper</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">entityUrn</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> aspect</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">aspect</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Create dataset in custom platform</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">sdk </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> DataHubClient</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> Dataset</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> client </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> DataHubClient</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">from_env</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> dataset </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> Dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> platform</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"<platformName>"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># See above</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> client</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">entities</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">upsert</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="linking-logical-models">Linking Logical Models<a href="#linking-logical-models" class="hash-link" aria-label="Direct link to Linking Logical Models" title="Direct link to Linking Logical Models"></a></h2><p>At its core, the logical -> physical relationship is created by the <a href="/docs/generated/metamodel/entities/dataset#logicalparent"><code>LogicalParent</code></a> aspect. To link columns, this aspect must also be created on each child schmea field entity. However, for ease of use, we recommend the OpenAPI endpoint.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="openapi">OpenAPI<a href="#openapi" class="hash-link" aria-label="Direct link to OpenAPI" title="Direct link to OpenAPI"></a></h3><p>The OpenAPI endpoint creates a logical -> physical relationship for a single logical-physical pair, as well as the column-level relationships between their columns, if specified.</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token function" style="color:rgb(130, 170, 255)">curl</span><span class="token plain"> -X POST </span><span class="token string" style="color:rgb(195, 232, 141)">'http://localhost:8080/openapi/v3/logical/<physical_child_urn>/relationship/physicalInstanceOf/<logical_model_urn>'</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> -H </span><span class="token string" style="color:rgb(195, 232, 141)">'accept: application/json'</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> -H </span><span class="token string" style="color:rgb(195, 232, 141)">'Content-Type: application/json'</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> -d </span><span class="token string" style="color:rgb(195, 232, 141)">'{</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token string" style="color:rgb(195, 232, 141)"> "<logical_column_name_0>": "<physical_column_name_0>",</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token string" style="color:rgb(195, 232, 141)"> "<logical_column_name_1>": "<physical_column_name_1>",</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token string" style="color:rgb(195, 232, 141)"> "<logical_column_name_2>": "<physical_column_name_2>"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token string" style="color:rgb(195, 232, 141)"> }'</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>These relationships can also be removed (as of DataHub Cloud v0.3.15):</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token function" style="color:rgb(130, 170, 255)">curl</span><span class="token plain"> -X DELETE </span><span class="token string" style="color:rgb(195, 232, 141)">'http://localhost:8080/openapi/v3/logical/<physical_child_urn>/relationship/physicalInstanceOf'</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> -H </span><span class="token string" style="color:rgb(195, 232, 141)">'accept: application/json'</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> -H </span><span class="token string" style="color:rgb(195, 232, 141)">'Content-Type: application/json'</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="python-sdk">Python SDK<a href="#python-sdk" class="hash-link" aria-label="Direct link to Python SDK" title="Direct link to Python SDK"></a></h3><p>The Python SDK can also query the same endpoint:</p><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">sdk </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> DataHubClient</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> client </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> DataHubClient</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">from_env</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> url </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> </span><span class="token string-interpolation string" style="color:rgb(195, 232, 141)">f"</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token string-interpolation interpolation">client</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token string-interpolation interpolation">_graph</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token string-interpolation interpolation">config</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token string-interpolation interpolation">server</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token string-interpolation string" style="color:rgb(195, 232, 141)">/openapi/v3/logical/</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token string-interpolation interpolation">child_urn</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token string-interpolation string" style="color:rgb(195, 232, 141)">/relationship/physicalInstanceOf/</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token string-interpolation interpolation">parent_urn</span><span class="token string-interpolation interpolation punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token string-interpolation string" style="color:rgb(195, 232, 141)">"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> client</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">_graph</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">_post_generic</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">url</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain">column</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">parent_name</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> column</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">child_name </span><span class="token keyword" style="font-style:italic">for</span><span class="token plain"> column </span><span class="token keyword" style="font-style:italic">in</span><span class="token plain"> columns</span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Or it can create a single relationship by emitting the <code>LogicalParent</code> aspect.</p><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">sdk </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> DataHubClient</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">emitter</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">mcp </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> MetadataChangeProposalWrapper</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">metadata</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">schema_classes </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> EdgeClass</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> LogicalParentClass</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> client </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> DataHubClient</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">from_env</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> client</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">_graph</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">emit</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">MetadataChangeProposalWrapper</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">entityUrn</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">child_urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> aspect</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">LogicalParentClass</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">parent</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">EdgeClass</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">destinationUrn</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">parent_urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The relationship can also be removed:</p><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">sdk </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> DataHubClient</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">emitter</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">mcp </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> MetadataChangeProposalWrapper</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">metadata</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">schema_classes </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> EdgeClass</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> LogicalParentClass</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> client </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> DataHubClient</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">from_env</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> client</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">_graph</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">emit</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">MetadataChangeProposalWrapper</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">entityUrn</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">child_urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> aspect</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">LogicalParentClass</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">parent</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token boolean" style="color:rgb(255, 88, 116)">None</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg 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