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<p>To use this Apache Druid extension, <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-time-min-max</code> in the extensions load list.</p>
<p>These aggregators enable more precise calculation of min and max time of given events than <code>__time</code> column whose granularity is sparse, the same as query granularity.
To use this feature, a &quot;timeMin&quot; or &quot;timeMax&quot; aggregator must be included at indexing time.
They can apply to any columns that can be converted to timestamp, which include Long, DateTime, Timestamp, and String types.</p>
<p>For example, when a data set consists of timestamp, dimension, and metric value like followings.</p>
<pre><code class="hljs"><span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T01:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  A  <span class="hljs-number">1</span>
<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T02:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  A  <span class="hljs-number">1</span>
<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T03:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  A  <span class="hljs-number">1</span>
<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T04:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  B  <span class="hljs-number">1</span>
<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T05:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  A  <span class="hljs-number">1</span>
<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T06:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  B  <span class="hljs-number">1</span>
<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T01:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  C  <span class="hljs-number">1</span>
<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T02:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  C  <span class="hljs-number">1</span>
<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T03:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  A  <span class="hljs-number">1</span>
<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T04:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z  A  <span class="hljs-number">1</span>
</code></pre>
<p>At ingestion time, timeMin and timeMax aggregator can be included as other aggregators.</p>
<pre><code class="hljs css language-json">{
    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timeMin"</span>,
    <span class="hljs-attr">"name"</span>: <span class="hljs-string">"tmin"</span>,
    <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"&lt;field_name, typically column specified in timestamp spec&gt;"</span>
}
</code></pre>
<pre><code class="hljs css language-json">{
    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timeMax"</span>,
    <span class="hljs-attr">"name"</span>: <span class="hljs-string">"tmax"</span>,
    <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"&lt;field_name, typically column specified in timestamp spec&gt;"</span>
}
</code></pre>
<p><code>name</code> is output name of aggregator and can be any string. <code>fieldName</code> is typically column specified in timestamp spec but can be any column that can be converted to timestamp.</p>
<p>To query for results, the same aggregators &quot;timeMin&quot; and &quot;timeMax&quot; is used.</p>
<pre><code class="hljs css language-json">{
  <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"groupBy"</span>,
  <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"timeMinMax"</span>,
  <span class="hljs-attr">"granularity"</span>: <span class="hljs-string">"DAY"</span>,
  <span class="hljs-attr">"dimensions"</span>: [<span class="hljs-string">"product"</span>],
  <span class="hljs-attr">"aggregations"</span>: [
    {
      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span>,
      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>
    },
    {
      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timeMin"</span>,
      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"&lt;output_name of timeMin&gt;"</span>,
      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"tmin"</span>
    },
    {
      <span class="hljs-attr">"type"</span>: <span class="hljs-string">"timeMax"</span>,
      <span class="hljs-attr">"name"</span>: <span class="hljs-string">"&lt;output_name of timeMax&gt;"</span>,
      <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"tmax"</span>
    }
  ],
  <span class="hljs-attr">"intervals"</span>: [
    <span class="hljs-string">"2010-01-01T00:00:00.000Z/2020-01-01T00:00:00.000Z"</span>
  ]
}
</code></pre>
<p>Then, result has min and max of timestamp, which is finer than query granularity.</p>
<pre><code class="hljs"><span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T00:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z A <span class="hljs-number">4</span> <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T01:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T05:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z
<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T00:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z B <span class="hljs-number">2</span> <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T04:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-28</span>T06:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z
<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T00:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z A <span class="hljs-number">2</span> <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T03:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T04:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z
<span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T00:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z C <span class="hljs-number">2</span> <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T01:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T02:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z
</code></pre>
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