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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"><a class="breadcrumbs__link" itemprop="item" href="/docs/managed-datahub/observe/assertions"><span itemprop="name">Assertions (Data Quality)</span></a><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/assertions/open-assertions-spec"><span itemprop="name">Open Assertions Specification</span></a><meta itemprop="position" content="3"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Snowflake</span><meta itemprop="position" content="4"></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>Snowflake DMF Assertions <!-- -->[BETA]</h1><p>The DataHub Open Assertion Compiler allows you to define your Data Quality assertions in a simple YAML format, and then compile them to be executed by Snowflake Data Metric Functions.
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Once compiled, you'll be able to register the compiled DMFs in your Snowflake environment, and extract their results them as part of your normal ingestion process for DataHub.
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Results of Snowflake DMF assertions will be reported as normal Assertion Results, viewable on a historical timeline in the context
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of the table with which they are associated.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="prerequisites">Prerequisites<a href="#prerequisites" class="hash-link" aria-label="Direct link to Prerequisites" title="Direct link to Prerequisites"></a></h2><ul><li>You must have a Snowflake Enterprise account, where the DMFs feature is enabled.</li><li>You must have the necessary permissions to provision DMFs in your Snowflake environment (see below)</li><li>You must have the necessary permissions to query the DMF results in your Snowflake environment (see below)</li><li>You must have DataHub instance with Snowflake metadata ingested. If you do not have existing snowflake ingestion, refer <a href="/docs/quick-ingestion-guides/snowflake/overview">Snowflake Quickstart Guide</a> to get started.</li><li>You must have DataHub CLI installed and run <a href="/docs/cli/#init"><code>datahub init</code></a>.</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="permissions">Permissions<a href="#permissions" class="hash-link" aria-label="Direct link to Permissions" title="Direct link to Permissions"></a></h3><p><em>Permissions required for registering DMFs</em></p><p>According to the latest Snowflake docs, here are the permissions the service account performing the
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DMF registration and ingestion must have:</p><table><thead><tr><th>Privilege</th><th>Object</th><th>Notes</th></tr></thead><tbody><tr><td>USAGE</td><td>Database, schema</td><td>Database and schema where snowflake DMFs will be created. This is configured in compile command described below.</td></tr><tr><td>CREATE FUNCTION</td><td>Schema</td><td>This privilege enables creating new DMF in schema configured in compile command.</td></tr><tr><td>EXECUTE DATA METRIC FUNCTION</td><td>Account</td><td>This privilege enables you to control which roles have access to server-agnostic compute resources to call the system DMF.</td></tr><tr><td>USAGE</td><td>Database, schema</td><td>These objects are the database and schema that contain the referenced table in the query.</td></tr><tr><td>OWNERSHIP</td><td>Table</td><td>This privilege enables you to associate a DMF with a referenced table.</td></tr><tr><td>USAGE</td><td>DMF</td><td>This privilege enables calling the DMF in schema configured in compile command.</td></tr></tbody></table><p>and the roles that must be granted:</p><table><thead><tr><th>Role</th><th>Notes</th></tr></thead><tbody><tr><td>SNOWFLAKE.DATA_METRIC_USER</td><td>To use System DMFs</td></tr></tbody></table><p><em>Permissions required for running DMFs (scheduled DMFs run with table owner's role)</em></p><p>Because scheduled DMFs run with the role of the table owner, the table owner must have the following privileges:</p><table><thead><tr><th>Privilege</th><th>Object</th><th>Notes</th></tr></thead><tbody><tr><td>USAGE</td><td>Database, schema</td><td>Database and schema where snowflake DMFs will be created. This is configured in compile command described below.</td></tr><tr><td>USAGE</td><td>DMF</td><td>This privilege enables calling the DMF in schema configured in compile power.</td></tr><tr><td>EXECUTE DATA METRIC FUNCTION</td><td>Account</td><td>This privilege enables you to control which roles have access to server-agnostic compute resources to call the system DMF.</td></tr></tbody></table><p>and the roles that must be granted:</p><table><thead><tr><th>Role</th><th>Notes</th></tr></thead><tbody><tr><td>SNOWFLAKE.DATA_METRIC_USER</td><td>To use System DMFs</td></tr></tbody></table><p><em>Permissions required for querying DMF results</em></p><p>In addition, the service account that will be executing DataHub Ingestion, and querying the DMF results, must have been granted the following system application roles:</p><table><thead><tr><th>Role</th><th>Notes</th></tr></thead><tbody><tr><td>DATA_QUALITY_MONITORING_VIEWER</td><td>Query the DMF results table</td></tr></tbody></table><p>To learn more about Snowflake DMFs and the privileges required to provision and query them, see the <a href="https://docs.snowflake.com/en/user-guide/data-quality-intro" target="_blank" rel="noopener noreferrer">Snowflake documentation</a>.</p><p><em>Example: Granting Permissions</em></p><div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sql codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">-- setup permissions to <assertion-registration-role> to create DMFs and associate DMFs with table</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">grant</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">usage</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">on</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">database</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"<dmf-database>"</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">to</span><span class="token plain"> role </span><span class="token string" style="color:rgb(195, 232, 141)">"<assertion-service-role>"</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">grant</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">usage</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">on</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">schema</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"<dmf-database>.<dmf-schema>"</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">to</span><span class="token plain"> role </span><span class="token string" style="color:rgb(195, 232, 141)">"<assertion-service-role>"</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">grant</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">create</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">function</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">on</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">schema</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"<dmf-database>.<dmf-schema>"</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">to</span><span class="token plain"> role </span><span class="token string" style="color:rgb(195, 232, 141)">"<assertion-service-role>"</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">-- grant ownership + rest of permissions to <assertion-service-role></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">grant</span><span class="token plain"> role </span><span class="token string" style="color:rgb(195, 232, 141)">"<table-owner-role>"</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">to</span><span class="token plain"> role </span><span class="token string" style="color:rgb(195, 232, 141)">"<assertion-service-role>"</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">-- setup permissions for <table-owner-role> to run DMFs on schedule</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">grant</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">usage</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">on</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">database</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"<dmf-database>"</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">to</span><span class="token plain"> role </span><span class="token string" style="color:rgb(195, 232, 141)">"<table-owner-role>"</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">grant</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">usage</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">on</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">schema</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"<dmf-database>.<dmf-schema>"</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">to</span><span class="token plain"> role </span><span class="token string" style="color:rgb(195, 232, 141)">"<table-owner-role>"</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">grant</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">usage</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">on</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">all</span><span class="token plain"> functions </span><span class="token operator" style="color:rgb(137, 221, 255)">in</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"<dmf-database>.<dmf-schema>"</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">to</span><span class="token plain"> role </span><span class="token string" style="color:rgb(195, 232, 141)">"<table-owner-role>"</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">grant</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">usage</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">on</span><span class="token plain"> future functions </span><span class="token operator" style="color:rgb(137, 221, 255)">in</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"<dmf-database>.<dmf-schema>"</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">to</span><span class="token plain"> role </span><span class="token string" style="color:rgb(195, 232, 141)">"<table-owner-role>"</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">grant</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">database</span><span class="token plain"> role SNOWFLAKE</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">DATA_METRIC_USER </span><span class="token keyword" style="font-style:italic">to</span><span class="token plain"> role </span><span class="token string" style="color:rgb(195, 232, 141)">"<table-owner-role>"</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">grant</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">execute</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">data</span><span class="token plain"> metric </span><span class="token keyword" style="font-style:italic">function</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">on</span><span class="token plain"> account </span><span class="token keyword" style="font-style:italic">to</span><span class="token plain"> role </span><span class="token string" style="color:rgb(195, 232, 141)">"<table-owner-role>"</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">-- setup permissions for <datahub-role> to query DMF results</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">grant</span><span class="token plain"> application role SNOWFLAKE</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">DATA_QUALITY_MONITORING_VIEWER </span><span class="token keyword" style="font-style:italic">to</span><span class="token plain"> role </span><span class="token string" style="color:rgb(195, 232, 141)">"<datahub_role>"</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="supported-assertion-types">Supported Assertion Types<a href="#supported-assertion-types" class="hash-link" aria-label="Direct link to Supported Assertion Types" title="Direct link to Supported Assertion Types"></a></h2><p>The following assertion types are currently supported by the DataHub Snowflake DMF Assertion Compiler:</p><ul><li><a href="/docs/managed-datahub/observe/freshness-assertions">Freshness</a></li><li><a href="/docs/managed-datahub/observe/volume-assertions">Volume</a></li><li><a href="/docs/managed-datahub/observe/column-assertions">Column</a></li><li><a href="/docs/managed-datahub/observe/custom-sql-assertions">Custom SQL</a></li></ul><p>Note that Schema Assertions are not currently supported.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="creating-snowflake-dmf-assertions">Creating Snowflake DMF Assertions<a href="#creating-snowflake-dmf-assertions" class="hash-link" aria-label="Direct link to Creating Snowflake DMF Assertions" title="Direct link to Creating Snowflake DMF Assertions"></a></h2><p>The process for declaring and running assertions backend by Snowflake DMFs consists of a few steps, which will be outlined
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in the following sections.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="step-1-define-your-data-quality-assertions-using-assertion-yaml-files">Step 1. Define your Data Quality assertions using Assertion YAML files<a href="#step-1-define-your-data-quality-assertions-using-assertion-yaml-files" class="hash-link" aria-label="Direct link to Step 1. Define your Data Quality assertions using Assertion YAML files" title="Direct link to Step 1. Define your Data Quality assertions using Assertion YAML files"></a></h3><p>See the section <strong>Declaring Assertions in YAML</strong> below for examples of how to define assertions in YAML.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="step-2-register-your-assertions-with-datahub">Step 2. Register your assertions with DataHub<a href="#step-2-register-your-assertions-with-datahub" class="hash-link" aria-label="Direct link to Step 2. Register your assertions with DataHub" title="Direct link to Step 2. Register your assertions with DataHub"></a></h3><p>Use the DataHub CLI to register your assertions with DataHub, so they become visible in the DataHub UI:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">datahub assertions upsert -f examples/library/assertions_configuration.yml</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="step-3-compile-the-assertions-into-snowflake-dmfs-using-the-datahub-cli">Step 3. Compile the assertions into Snowflake DMFs using the DataHub CLI<a href="#step-3-compile-the-assertions-into-snowflake-dmfs-using-the-datahub-cli" class="hash-link" aria-label="Direct link to Step 3. Compile the assertions into Snowflake DMFs using the DataHub CLI" title="Direct link to Step 3. Compile the assertions into Snowflake DMFs using the DataHub CLI"></a></h3><p>Next, we'll use the <code>assertions compile</code> command to generate the SQL code for the Snowflake DMFs,
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which can then be registered in Snowflake.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">datahub assertions compile -f examples/library/assertions_configuration.yml -p snowflake -x </span><span class="token assign-left variable" style="color:rgb(191, 199, 213)">DMF_SCHEMA</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token operator" style="color:rgb(137, 221, 255)"><</span><span class="token plain">db</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain">.</span><span class="token operator" style="color:rgb(137, 221, 255)"><</span><span class="token plain">schema-where-DMF-should-live</span><span class="token operator" style="color:rgb(137, 221, 255)">></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>Two files will be generated as output of running this command:</p><ul><li><code>dmf_definitions.sql</code>: This file contains the SQL code for the DMFs that will be registered in Snowflake.</li><li><code>dmf_associations.sql</code>: This file contains the SQL code for associating the DMFs with the target tables in Snowflake.</li></ul><p>By default in a folder called <code>target</code>. You can use config option <code>-o <output_folder></code> in <code>compile</code> command to write these compile artifacts in another folder.</p><p>Each of these artifacts will be important for the next steps in the process.</p><p><em>dmf_definitions.sql</em></p><p>This file stores the SQL code for the DMFs that will be registered in Snowflake, generated
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from your YAML assertion definitions during the compile step.</p><div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sql codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">-- Example dmf_definitions.sql</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">-- Start of Assertion 5c32eef47bd763fece7d21c7cbf6c659</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 keyword" style="font-style:italic">CREATE</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">or</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">REPLACE</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">DATA</span><span class="token plain"> METRIC </span><span class="token keyword" style="font-style:italic">FUNCTION</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> test_db</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">datahub_dmfs</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">datahub__5c32eef47bd763fece7d21c7cbf6c659 </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">ARGT </span><span class="token keyword" style="font-style:italic">TABLE</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">col_date </span><span class="token keyword" style="font-style:italic">DATE</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 keyword" style="font-style:italic">RETURNS</span><span class="token plain"> NUMBER</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">COMMENT</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">'Created via DataHub for assertion urn:li:assertion:5c32eef47bd763fece7d21c7cbf6c659 of type volume'</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">AS</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><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">select</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">case</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">when</span><span class="token plain"> metric </span><span class="token operator" style="color:rgb(137, 221, 255)"><=</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1000</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">then</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">else</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">0</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">end</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token keyword" style="font-style:italic">select</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">count</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</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><span class="token keyword" style="font-style:italic">as</span><span class="token plain"> metric </span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> TEST_DB</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token keyword" style="font-style:italic">PUBLIC</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">TEST_ASSERTIONS_ALL_TIMES </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" 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">-- End of Assertion 5c32eef47bd763fece7d21c7cbf6c659</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 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><em>dmf_associations.sql</em></p><p>This file stores the SQL code for associating with the target table,
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||
along with scheduling the generated DMFs to run on at particular times.</p><div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sql codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">-- Example dmf_associations.sql</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">-- Start of Assertion 5c32eef47bd763fece7d21c7cbf6c659</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 keyword" style="font-style:italic">ALTER</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">TABLE</span><span class="token plain"> TEST_DB</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token keyword" style="font-style:italic">PUBLIC</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">TEST_ASSERTIONS_ALL_TIMES </span><span class="token keyword" style="font-style:italic">SET</span><span class="token plain"> DATA_METRIC_SCHEDULE </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">'TRIGGER_ON_CHANGES'</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 keyword" style="font-style:italic">ALTER</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">TABLE</span><span class="token plain"> TEST_DB</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token keyword" style="font-style:italic">PUBLIC</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">TEST_ASSERTIONS_ALL_TIMES </span><span class="token keyword" style="font-style:italic">ADD</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">DATA</span><span class="token plain"> METRIC </span><span class="token keyword" style="font-style:italic">FUNCTION</span><span class="token plain"> test_db</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">datahub_dmfs</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">datahub__5c32eef47bd763fece7d21c7cbf6c659 </span><span class="token keyword" style="font-style:italic">ON</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">col_date</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">-- End of Assertion 5c32eef47bd763fece7d21c7cbf6c659</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 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="step-4-register-the-compiled-dmfs-in-your-snowflake-environment">Step 4. Register the compiled DMFs in your Snowflake environment<a href="#step-4-register-the-compiled-dmfs-in-your-snowflake-environment" class="hash-link" aria-label="Direct link to Step 4. Register the compiled DMFs in your Snowflake environment" title="Direct link to Step 4. Register the compiled DMFs in your Snowflake environment"></a></h3><p>Next, you'll need to run the generated SQL from the files output in Step 3 in Snowflake.</p><p>You can achieve this either by running the SQL files directly in the Snowflake UI, or by using the SnowSQL CLI tool:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">snowsql -f dmf_definitions.sql</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">snowsql -f dmf_associations.sql</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>:::NOTE
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Scheduling Data Metric Function on table incurs Serverless Credit Usage in Snowflake. Refer <a href="https://docs.snowflake.com/en/user-guide/data-quality-intro#billing-and-pricing" target="_blank" rel="noopener noreferrer">Billing and Pricing</a> for more details.
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||
Please ensure you DROP Data Metric Function created via dmf_associations.sql if the assertion is no longer in use.
|
||
:::</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="step-5-run-ingestion-to-report-the-results-back-into-datahub">Step 5. Run ingestion to report the results back into DataHub<a href="#step-5-run-ingestion-to-report-the-results-back-into-datahub" class="hash-link" aria-label="Direct link to Step 5. Run ingestion to report the results back into DataHub" title="Direct link to Step 5. Run ingestion to report the results back into DataHub"></a></h3><p>Once you've registered the DMFs, they will be automatically executed, either when the target table is updated or on a fixed
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||
schedule.</p><p>To report the results of the generated Data Quality assertions back into DataHub, you'll need to run the DataHub ingestion process with a special configuration
|
||
flag: <code>include_assertion_results: true</code>:</p><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Your DataHub Snowflake Recipe</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">source</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 key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> snowflake</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">config</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"># ...</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">include_assertion_results</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token boolean important" style="color:rgb(255, 88, 116)">True</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"># ...</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>During ingestion we will query for the latest DMF results stored in Snowflake, convert them into DataHub Assertion Results, and report the results back into DataHub during your ingestion process
|
||
either via CLI or the UI visible as normal assertions.</p><p><code>datahub ingest -c snowflake.yml</code></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="caveats">Caveats<a href="#caveats" class="hash-link" aria-label="Direct link to Caveats" title="Direct link to Caveats"></a></h2><ul><li>Currently, Snowflake supports at most 1000 DMF-table associations at the moment so you can not define more than 1000 assertions for snowflake.</li><li>Currently, Snowflake does not allow JOIN queries or non-deterministic functions in DMF definition so you can not use these in SQL for SQL assertion or in filters section.</li><li>Currently, all DMFs scheduled on a table must follow same exact schedule, so you can not set assertions on same table to run on different schedules.</li><li>Currently, DMFs are only supported for regular tables and not dynamic or external tables.</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="faq">FAQ<a href="#faq" class="hash-link" aria-label="Direct link to FAQ" title="Direct link to FAQ"></a></h2><p>Coming soon!</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="slackUtm_uoBr"><div class="slackUtm_uoBr"><hr>Need more help? 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Define your Data Quality assertions using Assertion YAML files</a></li><li><a href="#step-2-register-your-assertions-with-datahub" class="table-of-contents__link toc-highlight">Step 2. Register your assertions with DataHub</a></li><li><a href="#step-3-compile-the-assertions-into-snowflake-dmfs-using-the-datahub-cli" class="table-of-contents__link toc-highlight">Step 3. Compile the assertions into Snowflake DMFs using the DataHub CLI</a></li><li><a href="#step-4-register-the-compiled-dmfs-in-your-snowflake-environment" class="table-of-contents__link toc-highlight">Step 4. Register the compiled DMFs in your Snowflake environment</a></li><li><a href="#step-5-run-ingestion-to-report-the-results-back-into-datahub" class="table-of-contents__link toc-highlight">Step 5. 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