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- <li class="toctree-l2"><a class="reference internal" href="/docs/monitoring-and-canceling-queries-in-the-drill-web-console/">Monitoring and Canceling Queries in the Drill Web Console</a></li>
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- <h1>Analyzing Highly Dynamic Datasets</h1>
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- <p>Today\u2019s data is dynamic and application-driven. The growth of a new era of business applications driven by industry trends such as web, social, mobile, and Internet of Things are generating datasets with new data types and new data models. These applications are iterative, and the associated data models typically are semi-structured, schema-less and constantly evolving. Semi-structured data models can be complex/nested, schema-less, and capable of having varying fields in every single row and of constantly evolving as fields get added and removed frequently to meet business requirements. </p>
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-<p>This tutorial shows you how to natively query dynamic datasets, such as JSON, and derive insights from any type of data in minutes. The dataset used in the example is from the Yelp check-ins dataset, which has the following structure:</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">check-in
-{
- 'type': 'checkin',
- 'business_id': (encrypted business id),
- 'checkin_info': {
- '0-0': (number of checkins from 00:00 to 01:00 on all Sundays),
- '1-0': (number of checkins from 01:00 to 02:00 on all Sundays),
- ...
- '14-4': (number of checkins from 14:00 to 15:00 on all Thursdays),
- ...
- '23-6': (number of checkins from 23:00 to 00:00 on all Saturdays)
- }, # if there was no checkin for a hour-day block it will not be in the dataset
-}
-</code></pre></div>
-<p>It is worth repeating the comment at the bottom of this snippet:</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text"> # if there was no checkin for a hour-day block it will not be in the dataset.
-</code></pre></div>
-<p>The element names that you see in the <code>checkin_info</code> are unknown upfront and can vary for every row. The data, although simple, is highly dynamic data. To analyze the data there is no need to first represent this dataset in a flattened relational structure, as you would using any other SQL on Hadoop technology.</p>
-
-<hr>
-
-<p>Step 1: First download Drill, if you have not yet done so, onto your machine</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">http://drill.apache.org/download/
-tar -xvf apache-drill-0.9.0.tar
-</code></pre></div>
-<p>Install Drill locally on your desktop (embedded mode). You don\u2019t need Hadoop.</p>
-
-<hr>
-
-<p>Step 2: Start the Drill shell.</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">bin/drill-embedded
-</code></pre></div>
-<hr>
-
-<p>Step 3: Start analyzing the data using SQL</p>
-
-<p>First, let\u2019s take a look at the dataset:</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> SELECT * FROM dfs.`/users/nrentachintala/Downloads/yelp/yelp_academic_dataset_checkin.json` limit 2;
-+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------+------------------------+
-| checkin_info | type | business_id |
-+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------+------------------------+
-| {"3-4":1,"13-5":1,"6-6":1,"14-5":1,"14-6":1,"14-2":1,"14-3":1,"19-0":1,"11-5":1,"13-2":1,"11-6":2,"11-3":1,"12-6":1,"6-5":1,"5-5":1,"9-2":1,"9-5":1,"9-6":1,"5-2":1,"7-6":1,"7-5":1,"7-4":1,"17-5":1,"8-5":1,"10-2":1,"10-5":1,"10-6":1} | checkin | JwUE5GmEO-sH1FuwJgKBlQ |
-| {"6-6":2,"6-5":1,"7-6":1,"7-5":1,"8-5":2,"10-5":1,"9-3":1,"12-5":1,"15-3":1,"15-5":1,"15-6":1,"16-3":1,"10-0":1,"15-4":1,"10-4":1,"8-2":1} | checkin | uGykseHzyS5xAMWoN6YUqA |
-+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------+------------------------+
-</code></pre></div>
-<div class="admonition note">
- <p class="first admonition-title">Note</p>
- <p class="last">This document aligns Drill output for example purposes. Drill output is not aligned in this case. </p>
-</div>
-
-<p>You query the data in JSON files directly. Schema definitions in Hive store are not necessary. The names of the elements within the <code>checkin_info</code> column are different between the first and second row.</p>
-
-<p>Drill provides a function called KVGEN (Key Value Generator) which is useful when working with complex data that contains arbitrary maps consisting of dynamic and unknown element names such as checkin_info. KVGEN turns the dynamic map into an array of key-value pairs where keys represent the dynamic element names.</p>
-
-<p>Let\u2019s apply KVGEN on the <code>checkin_info</code> element to generate key-value pairs.</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> SELECT KVGEN(checkin_info) checkins FROM dfs.`/users/nrentachintala/Downloads/yelp/yelp_academic_dataset_checkin.json` LIMIT 2;
-+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-| checkins |
-+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-| [{"key":"3-4","value":1},{"key":"13-5","value":1},{"key":"6-6","value":1},{"key":"14-5","value":1},{"key":"14-6","value":1},{"key":"14-2","value":1},{"key":"14-3","value":1},{"key":"19-0","value":1},{"key":"11-5","value":1},{"key":"13-2","value":1},{"key":"11-6","value":2},{"key":"11-3","value":1},{"key":"12-6","value":1},{"key":"6-5","value":1},{"key":"5-5","value":1},{"key":"9-2","value":1},{"key":"9-5","value":1},{"key":"9-6","value":1},{"key&
quot;:"5-2","value":1},{"key":"7-6","value":1},{"key":"7-5","value":1},{"key":"7-4","value":1},{"key":"17-5","value":1},{"key":"8-5","value":1},{"key":"10-2","value":1},{"key":"10-5","value":1},{"key":"10-6","value":1}] |
-| [{"key":"6-6","value":2},{"key":"6-5","value":1},{"key":"7-6","value":1},{"key":"7-5","value":1},{"key":"8-5","value":2},{"key":"10-5","value":1},{"key":"9-3","value":1},{"key":"12-5","value":1},{"key":"15-3","value":1},{"key":"15-5","value":1},{"key":"15-6","value":1},{"key":"16-3","value":1},{"key":"10-0","value":1},{"key":"15-4","value":1},{"key":"10-4","value":1},{"key":"8-2","value":1}]
|
-+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-</code></pre></div>
-<p>Drill provides another function to operate on complex data called \u2018Flatten\u2019 to break the list of key-value pairs resulting from \u2018KVGen\u2019 into separate rows to further apply analytic functions on it.</p>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> SELECT FLATTEN(KVGEN(checkin_info)) checkins FROM dfs.`/users/nrentachintala/Downloads/yelp/yelp_academic_dataset_checkin.json` LIMIT 20;
-+--------------------------+
-| checkins |
-+--------------------------+
-| {"key":"3-4","value":1} |
-| {"key":"13-5","value":1} |
-| {"key":"6-6","value":1} |
-| {"key":"14-5","value":1} |
-| {"key":"14-6","value":1} |
-| {"key":"14-2","value":1} |
-| {"key":"14-3","value":1} |
-| {"key":"19-0","value":1} |
-| {"key":"11-5","value":1} |
-| {"key":"13-2","value":1} |
-| {"key":"11-6","value":2} |
-| {"key":"11-3","value":1} |
-| {"key":"12-6","value":1} |
-| {"key":"6-5","value":1} |
-| {"key":"5-5","value":1} |
-| {"key":"9-2","value":1} |
-| {"key":"9-5","value":1} |
-| {"key":"9-6","value":1} |
-| {"key":"5-2","value":1} |
-| {"key":"7-6","value":1} |
-+--------------------------+
-</code></pre></div>
-<p>You can get value from the data quickly by applying both KVGEN and FLATTEN functions on the datasets on the fly--no need for time-consuming schema definitions and data storage in intermediate formats.</p>
-
-<p>On the output of flattened data, you use standard SQL functionality such as filters , aggregates, and sort. Let\u2019s see a few examples.</p>
-
-<h3 id="get-the-total-number-of-check-ins-recorded-in-the-yelp-dataset">Get the total number of check-ins recorded in the Yelp dataset</h3>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> SELECT SUM(checkintbl.checkins.`value`) AS TotalCheckins FROM (
-. . . . . . . . . . . > SELECT FLATTEN(KVGEN(checkin_info)) checkins FROM dfs.`/users/nrentachintala/Downloads/yelp/yelp_academic_dataset_checkin.json` ) checkintbl
-. . . . . . . . . . . > ;
-+---------------+
-| TotalCheckins |
-+---------------+
-| 4713811 |
-+---------------+
-</code></pre></div>
-<h3 id="get-the-number-of-check-ins-specifically-for-sunday-midnights">Get the number of check-ins specifically for Sunday midnights</h3>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> SELECT SUM(checkintbl.checkins.`value`) AS SundayMidnightCheckins FROM (
-. . . . . . . . . . . > SELECT FLATTEN(KVGEN(checkin_info)) checkins FROM dfs.`/users/nrentachintala/Downloads/yelp/yelp_academic_dataset_checkin.json` ) checkintbl WHERE checkintbl.checkins.key='23-0';
-+------------------------+
-| SundayMidnightCheckins |
-+------------------------+
-| 8575 |
-+------------------------+
-</code></pre></div>
-<h3 id="get-the-number-of-check-ins-per-day-of-the-week">Get the number of check-ins per day of the week</h3>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> SELECT `right`(checkintbl.checkins.key,1) WeekDay,sum(checkintbl.checkins.`value`) TotalCheckins from (
-. . . . . . . . . . . > select flatten(kvgen(checkin_info)) checkins FROM dfs.`/users/nrentachintala/Downloads/yelp/yelp_academic_dataset_checkin.json` ) checkintbl GROUP BY `right`(checkintbl.checkins.key,1) ORDER BY TotalCheckins;
-+------------+---------------+
-| WeekDay | TotalCheckins |
-+------------+---------------+
-| 1 | 545626 |
-| 0 | 555038 |
-| 2 | 555747 |
-| 3 | 596296 |
-| 6 | 735830 |
-| 4 | 788073 |
-| 5 | 937201 |
-+------------+---------------+
-</code></pre></div>
-<h3 id="get-the-number-of-check-ins-per-hour-of-the-day">Get the number of check-ins per hour of the day</h3>
-<div class="highlight"><pre><code class="language-text" data-lang="text">0: jdbc:drill:zk=local> SELECT SUBSTR(checkintbl.checkins.key,1,strpos(checkintbl.checkins.key,'-')-1) AS HourOfTheDay ,SUM(checkintbl.checkins.`value`) TotalCheckins FROM (
-. . . . . . . . . . . > SELECT FLATTEN(KVGEN(checkin_info)) checkins FROM dfs.`/users/nrentachintala/Downloads/yelp/yelp_academic_dataset_checkin.json` ) checkintbl GROUP BY SUBSTR(checkintbl.checkins.key,1,strpos(checkintbl.checkins.key,'-')-1) ORDER BY TotalCheckins;
-+--------------+---------------+
-| HourOfTheDay | TotalCheckins |
-+--------------+---------------+
-| 3 | 20357 |
-| 4 | 21076 |
-| 2 | 28116 |
-| 5 | 33842 |
-| 1 | 45467 |
-| 6 | 54174 |
-| 0 | 74127 |
-| 7 | 96329 |
-| 23 | 102009 |
-| 8 | 130091 |
-| 22 | 140338 |
-| 9 | 162913 |
-| 21 | 211949 |
-| 10 | 220687 |
-| 15 | 261384 |
-| 14 | 276188 |
-| 16 | 292547 |
-| 20 | 293783 |
-| 13 | 328373 |
-| 11 | 338675 |
-| 17 | 374186 |
-| 19 | 385381 |
-| 12 | 399797 |
-| 18 | 422022 |
-+--------------+---------------+
-</code></pre></div>
-<hr>
-
-<h2 id="summary">Summary</h2>
-
-<p>In this tutorial, you surf both structured and semi-structured data without any upfront schema management or ETL.</p>
-
-
-
- <div class="doc-nav">
-
- <span class="previous-toc"><a href="/docs/summary/">\u2190 Summary</a></span><span class="next-toc"><a href="/docs/analyzing-social-media/">Analyzing Social Media \u2192</a></span>
-</div>
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- </div>
- </div>
-</div>
-
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