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| <li class="toctree-l1 current"><a class="current reference internal" href="#">Druid</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="#aggregations">Aggregations</a></li> |
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| <div class="section" id="druid"> |
| <h1>Druid<a class="headerlink" href="#druid" title="Permalink to this headline">¶</a></h1> |
| <p>Superset has a native connector to Druid, and a majority of Druid’s |
| features are accessible through Superset.</p> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">Druid now supports SQL and can be accessed through Superset’s |
| SQLAlchemy connector. The long term vision is to deprecate |
| the Druid native REST connector and query Druid exclusively through |
| the SQL interface.</p> |
| </div> |
| <div class="section" id="aggregations"> |
| <h2>Aggregations<a class="headerlink" href="#aggregations" title="Permalink to this headline">¶</a></h2> |
| <p>Common aggregations, or Druid metrics can be defined and used in Superset. |
| The first and simpler use case is to use the checkbox matrix expose in your |
| datasource’s edit view (<code class="docutils literal"><span class="pre">Sources</span> <span class="pre">-></span> <span class="pre">Druid</span> <span class="pre">Datasources</span> <span class="pre">-></span> |
| <span class="pre">[your</span> <span class="pre">datasource]</span> <span class="pre">-></span> <span class="pre">Edit</span> <span class="pre">-></span> <span class="pre">[tab]</span> <span class="pre">List</span> <span class="pre">Druid</span> <span class="pre">Column</span></code>). |
| Clicking the <code class="docutils literal"><span class="pre">GroupBy</span></code> and <code class="docutils literal"><span class="pre">Filterable</span></code> checkboxes will make the column |
| appear in the related dropdowns while in explore view. Checking |
| <code class="docutils literal"><span class="pre">Count</span> <span class="pre">Distinct</span></code>, <code class="docutils literal"><span class="pre">Min</span></code>, <code class="docutils literal"><span class="pre">Max</span></code> or <code class="docutils literal"><span class="pre">Sum</span></code> will result in creating |
| new metrics that will appear in the <code class="docutils literal"><span class="pre">List</span> <span class="pre">Druid</span> <span class="pre">Metric</span></code> tab upon saving the |
| datasource. By editing these metrics, you’ll notice that they their <code class="docutils literal"><span class="pre">json</span></code> |
| element correspond to Druid aggregation definition. You can create your own |
| aggregations manually from the <code class="docutils literal"><span class="pre">List</span> <span class="pre">Druid</span> <span class="pre">Metric</span></code> tab following Druid |
| documentation.</p> |
| <a class="reference internal image-reference" href="_images/druid_agg.png"><img alt="_images/druid_agg.png" src="_images/druid_agg.png" style="width: 894.0px; height: 564.0px;" /></a> |
| </div> |
| <div class="section" id="post-aggregations"> |
| <h2>Post-Aggregations<a class="headerlink" href="#post-aggregations" title="Permalink to this headline">¶</a></h2> |
| <p>Druid supports post aggregation and this works in Superset. All you have to |
| do is creating a metric, much like you would create an aggregation manually, |
| but specify <code class="docutils literal"><span class="pre">postagg</span></code> as a <code class="docutils literal"><span class="pre">Metric</span> <span class="pre">Type</span></code>. You then have to provide a valid |
| json post-aggregation definition (as specified in the Druid docs) in the |
| Json field.</p> |
| </div> |
| <div class="section" id="unsupported-features"> |
| <h2>Unsupported Features<a class="headerlink" href="#unsupported-features" title="Permalink to this headline">¶</a></h2> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">Unclear at this point, this section of the documentation could use |
| some input.</p> |
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