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<h1 id="time-boundary-queries">Time Boundary Queries</h1>
<p>Time boundary queries return the earliest and latest data points of a data set. The grammar is:</p>
<div class="highlight"><pre><code class="language-json" data-lang="json"><span></span><span class="p">{</span>
<span class="nt">&quot;queryType&quot;</span> <span class="p">:</span> <span class="s2">&quot;timeBoundary&quot;</span><span class="p">,</span>
<span class="nt">&quot;dataSource&quot;</span><span class="p">:</span> <span class="s2">&quot;sample_datasource&quot;</span><span class="p">,</span>
<span class="nt">&quot;bound&quot;</span> <span class="p">:</span> <span class="err">&lt;</span> <span class="s2">&quot;maxTime&quot;</span> <span class="err">|</span> <span class="s2">&quot;minTime&quot;</span> <span class="err">&gt;</span> <span class="err">#</span> <span class="err">optional</span><span class="p">,</span> <span class="err">defaults</span> <span class="err">to</span> <span class="err">returning</span> <span class="err">both</span> <span class="err">timestamps</span> <span class="err">if</span> <span class="err">not</span> <span class="err">set</span>
<span class="nt">&quot;filter&quot;</span> <span class="p">:</span> <span class="p">{</span> <span class="nt">&quot;type&quot;</span><span class="p">:</span> <span class="s2">&quot;and&quot;</span><span class="p">,</span> <span class="nt">&quot;fields&quot;</span><span class="p">:</span> <span class="p">[</span><span class="err">&lt;filter&gt;</span><span class="p">,</span> <span class="err">&lt;filter&gt;</span><span class="p">,</span> <span class="err">...</span><span class="p">]</span> <span class="p">}</span> <span class="err">#</span> <span class="err">optional</span>
<span class="p">}</span>
</code></pre></div>
<p>There are 3 main parts to a time boundary query:</p>
<table><thead>
<tr>
<th>property</th>
<th>description</th>
<th>required?</th>
</tr>
</thead><tbody>
<tr>
<td>queryType</td>
<td>This String should always be &quot;timeBoundary&quot;; this is the first thing Apache Druid (incubating) looks at to figure out how to interpret the query</td>
<td>yes</td>
</tr>
<tr>
<td>dataSource</td>
<td>A String or Object defining the data source to query, very similar to a table in a relational database. See <a href="../querying/datasource.html">DataSource</a> for more information.</td>
<td>yes</td>
</tr>
<tr>
<td>bound</td>
<td>Optional, set to <code>maxTime</code> or <code>minTime</code> to return only the latest or earliest timestamp. Default to returning both if not set</td>
<td>no</td>
</tr>
<tr>
<td>filter</td>
<td>See <a href="../querying/filters.html">Filters</a></td>
<td>no</td>
</tr>
<tr>
<td>context</td>
<td>See <a href="../querying/query-context.html">Context</a></td>
<td>no</td>
</tr>
</tbody></table>
<p>The format of the result is:</p>
<div class="highlight"><pre><code class="language-json" data-lang="json"><span></span><span class="p">[</span> <span class="p">{</span>
<span class="nt">&quot;timestamp&quot;</span> <span class="p">:</span> <span class="s2">&quot;2013-05-09T18:24:00.000Z&quot;</span><span class="p">,</span>
<span class="nt">&quot;result&quot;</span> <span class="p">:</span> <span class="p">{</span>
<span class="nt">&quot;minTime&quot;</span> <span class="p">:</span> <span class="s2">&quot;2013-05-09T18:24:00.000Z&quot;</span><span class="p">,</span>
<span class="nt">&quot;maxTime&quot;</span> <span class="p">:</span> <span class="s2">&quot;2013-05-09T18:37:00.000Z&quot;</span>
<span class="p">}</span>
<span class="p">}</span> <span class="p">]</span>
</code></pre></div>
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