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<p>Time boundary queries return the earliest and latest data points of a data set. The grammar is:</p>
<pre><code class="hljs css language-json">{
    "queryType" : "timeBoundary",
    "dataSource": "sample_datasource",
    "bound"     : &lt; "maxTime" | "minTime" &gt; # optional, defaults to returning both timestamps if not set
    "filter"    : { "type": "and", "fields": [&lt;filter&gt;, &lt;filter&gt;, ...] } # optional
}
</code></pre>
<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 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="/docs/latest/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="/docs/latest/querying/filters.html">Filters</a></td><td>no</td></tr>
<tr><td>context</td><td>See <a href="/docs/latest/querying/query-context.html">Context</a></td><td>no</td></tr>
</tbody>
</table>
<p>The format of the result is:</p>
<pre><code class="hljs css language-json">[ {
  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-05-09T18:24:00.000Z"</span>,
  <span class="hljs-attr">"result"</span> : {
    <span class="hljs-attr">"minTime"</span> : <span class="hljs-string">"2013-05-09T18:24:00.000Z"</span>,
    <span class="hljs-attr">"maxTime"</span> : <span class="hljs-string">"2013-05-09T18:37:00.000Z"</span>
  }
} ]
</code></pre>
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