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Partitioning<a class="headerlink" href="#column-partitioning" title="Permalink to this headline">¶</a></h1> +<p>The column table partition is designed to support the partition of Apache Hiveâ¢.</p> +<div class="section" id="how-to-create-a-column-partitioned-table"> +<h2>How to Create a Column Partitioned Table<a class="headerlink" href="#how-to-create-a-column-partitioned-table" title="Permalink to this headline">¶</a></h2> +<p>You can create a partitioned table by using the <code class="docutils literal"><span class="pre">PARTITION</span> <span class="pre">BY</span></code> clause. For a column partitioned table, you should use +the <code class="docutils literal"><span class="pre">PARTITION</span> <span class="pre">BY</span> <span class="pre">COLUMN</span></code> clause with partition keys.</p> +<p>For example, assume a table with the following schema.</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="n">id</span> <span class="nb">INT</span><span class="p">,</span> +<span class="n">name</span> <span class="nb">TEXT</span><span class="p">,</span> +<span class="n">gender</span> <span class="nb">char</span><span class="p">(</span><span class="mi">1</span><span class="p">),</span> +<span class="n">grade</span> <span class="nb">TEXT</span><span class="p">,</span> +<span class="n">country</span> <span class="nb">TEXT</span><span class="p">,</span> +<span class="n">city</span> <span class="nb">TEXT</span><span class="p">,</span> +<span class="n">phone</span> <span class="nb">TEXT</span> +<span class="p">);</span> +</pre></div> +</div> +<p>If you want to make country as partitioned column, your Tajo definition would be this:</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">student</span> <span class="p">(</span> + <span class="n">id</span> <span class="nb">INT</span><span class="p">,</span> + <span class="n">name</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">gender</span> <span class="nb">char</span><span class="p">(</span><span class="mi">1</span><span class="p">),</span> + <span class="n">grade</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">city</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">phone</span> <span class="nb">TEXT</span> +<span class="p">)</span> <span class="n">PARTITION</span> <span class="k">BY</span> <span class="k">COLUMN</span> <span class="p">(</span><span class="n">country</span> <span class="nb">TEXT</span><span class="p">);</span> +</pre></div> +</div> +<p>Let us assume you want to use more partition columns and parquet file format. Here’s an example statement to create a table:</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">student</span> <span class="p">(</span> + <span class="n">id</span> <span class="nb">INT</span><span class="p">,</span> + <span class="n">name</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">gender</span> <span class="nb">char</span><span class="p">(</span><span class="mi">1</span><span class="p">),</span> + <span class="n">grade</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">phone</span> <span class="nb">TEXT</span> +<span class="p">)</span> <span class="k">USING</span> <span class="n">PARQUET</span> +<span class="n">PARTITION</span> <span class="k">BY</span> <span class="k">COLUMN</span> <span class="p">(</span><span class="n">country</span> <span class="nb">TEXT</span><span class="p">,</span> <span class="n">city</span> <span class="nb">TEXT</span><span class="p">);</span> +</pre></div> +</div> +<p>The statement above creates the student table with id, name, grade, etc. The table is also partitioned and data is stored in parquet files.</p> +<p>You might have noticed that while the partitioning key columns are a part of the table DDL, theyâre only listed in the <code class="docutils literal"><span class="pre">PARTITION</span> <span class="pre">BY</span></code> clause. In Tajo, as data is written to disk, each partition of data will be automatically split out into different folders, e.g. country=USA/city=NEWYORK. During a read operation, Tajo will use the folder structure to quickly locate the right partitions and also return the partitioning columns as columns in the result set.</p> +</div> +<div class="section" id="querying-partitioned-tables"> +<h2>Querying Partitioned Tables<a class="headerlink" href="#querying-partitioned-tables" title="Permalink to this headline">¶</a></h2> +<p>If a table created using the <code class="docutils literal"><span class="pre">PARTITION</span> <span class="pre">BY</span></code> clause, a query can do partition pruning and scan only a fraction of the table relevant to the partitions specified by the query. Tajo currently does partition pruning if the partition predicates are specified in the WHERE clause. For example, if table student is partitioned on column country and column city, the following query retrieves rows in <code class="docutils literal"><span class="pre">country=KOREA\city=SEOUL</span></code> directory.</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">student</span> <span class="k">WHERE</span> <span class="n">country</span> <span class="o">=</span> <span class="s1">'KOREA'</span> <span class="k">AND</span> <span class="n">city</span> <span class="o">=</span> <span class="s1">'SEOUL'</span><span class="p">;</span> +</pre></div> +</div> +<p>The following predicates in the <code class="docutils literal"><span class="pre">WHERE</span></code> clause can be used to prune column partitions during query planning phase.</p> +<ul class="simple"> +<li><code class="docutils literal"><span class="pre">=</span></code></li> +<li><code class="docutils literal"><span class="pre"><></span></code></li> +<li><code class="docutils literal"><span class="pre">></span></code></li> +<li><code class="docutils literal"><span class="pre"><</span></code></li> +<li><code class="docutils literal"><span class="pre">>=</span></code></li> +<li><code class="docutils literal"><span class="pre"><=</span></code></li> +<li>LIKE predicates with a leading wild-card character</li> +<li>IN list predicates</li> +</ul> +</div> +<div class="section" id="add-data-to-partition-table"> +<h2>Add data to Partition Table<a class="headerlink" href="#add-data-to-partition-table" title="Permalink to this headline">¶</a></h2> +<p>Tajo provides a very useful feature of dynamic partitioning. You don’t need to use any syntax with both <code class="docutils literal"><span class="pre">INSERT</span> <span class="pre">INTO</span> <span class="pre">...</span> <span class="pre">SELECT</span></code> and <code class="docutils literal"><span class="pre">Create</span> <span class="pre">Table</span> <span class="pre">As</span> <span class="pre">Select(CTAS)</span></code> statments for dynamic partitioning. Tajo will automatically filter the data, create directories, move filtered data to appropriate directory and create partition over it.</p> +<p>For example, assume there are both <code class="docutils literal"><span class="pre">student_source</span></code> and <code class="docutils literal"><span class="pre">student</span></code> tables composed of the following schema.</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">student_source</span> <span class="p">(</span> + <span class="n">id</span> <span class="nb">INT</span><span class="p">,</span> + <span class="n">name</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">gender</span> <span class="nb">char</span><span class="p">(</span><span class="mi">1</span><span class="p">),</span> + <span class="n">grade</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">country</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">city</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">phone</span> <span class="nb">TEXT</span> +<span class="p">);</span> + +<span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">student</span> <span class="p">(</span> + <span class="n">id</span> <span class="nb">INT</span><span class="p">,</span> + <span class="n">name</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">gender</span> <span class="nb">char</span><span class="p">(</span><span class="mi">1</span><span class="p">),</span> + <span class="n">grade</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">phone</span> <span class="nb">TEXT</span> +<span class="p">)</span> <span class="n">PARTITION</span> <span class="k">BY</span> <span class="k">COLUMN</span> <span class="p">(</span><span class="n">country</span> <span class="nb">TEXT</span><span class="p">,</span> <span class="n">city</span> <span class="nb">TEXT</span><span class="p">);</span> +</pre></div> +</div> +<div class="section" id="how-to-insert-dynamically-to-partition-table"> +<h3>How to INSERT dynamically to partition table<a class="headerlink" href="#how-to-insert-dynamically-to-partition-table" title="Permalink to this headline">¶</a></h3> +<p>If you want to load an entire country or an entire city in one fell swoop:</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">INSERT</span> <span class="n">OVERWRITE</span> <span class="k">INTO</span> <span class="n">student</span> +<span class="k">SELECT</span> <span class="n">id</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">gender</span><span class="p">,</span> <span class="n">grade</span><span class="p">,</span> <span class="n">phone</span><span class="p">,</span> <span class="n">country</span><span class="p">,</span> <span class="n">city</span> +<span class="k">FROM</span> <span class="n">student_source</span><span class="p">;</span> +</pre></div> +</div> +</div> +<div class="section" id="how-to-ctas-dynamically-to-partition-table"> +<h3>How to CTAS dynamically to partition table<a class="headerlink" href="#how-to-ctas-dynamically-to-partition-table" title="Permalink to this headline">¶</a></h3> +<p>when a partition table is created:</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">DROP</span> <span class="k">TABLE</span> <span class="n">if</span> <span class="k">exists</span> <span class="n">student</span><span class="p">;</span> + +<span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">student</span> <span class="p">(</span> + <span class="n">id</span> <span class="nb">INT</span><span class="p">,</span> + <span class="n">name</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">gender</span> <span class="nb">char</span><span class="p">(</span><span class="mi">1</span><span class="p">),</span> + <span class="n">grade</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">phone</span> <span class="nb">TEXT</span> +<span class="p">)</span> <span class="n">PARTITION</span> <span class="k">BY</span> <span class="k">COLUMN</span> <span class="p">(</span><span class="n">country</span> <span class="nb">TEXT</span><span class="p">,</span> <span class="n">city</span> <span class="nb">TEXT</span><span class="p">)</span> +<span class="k">AS</span> <span class="k">SELECT</span> <span class="n">id</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">gender</span><span class="p">,</span> <span class="n">grade</span><span class="p">,</span> <span class="n">phone</span><span class="p">,</span> <span class="n">country</span><span class="p">,</span> <span class="n">city</span> +<span class="k">FROM</span> <span class="n">student_source</span><span class="p">;</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">When loading data into a partition, itâs necessary to include the partition columns as the last columns in the query. The column names in the source query donât need to match the partition column names.</p> +</div> +</div> +</div> +<div class="section" id="compatibility-issues-with-apache-hive"> +<h2>Compatibility Issues with Apache Hiveâ¢<a class="headerlink" href="#compatibility-issues-with-apache-hive" title="Permalink to this headline">¶</a></h2> +<p>If partitioned tables of Hive are created as external tables in Tajo, Tajo can process the Hive partitioned tables directly.</p> +<div class="section" id="how-to-create-partition-table"> +<h3>How to create partition table<a class="headerlink" href="#how-to-create-partition-table" title="Permalink to this headline">¶</a></h3> +<p>If you create a partition table as follows in Tajo:</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">default</span><span class="o">></span> <span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">student</span> <span class="p">(</span> + <span class="n">id</span> <span class="nb">INT</span><span class="p">,</span> + <span class="n">name</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">gender</span> <span class="nb">char</span><span class="p">(</span><span class="mi">1</span><span class="p">),</span> + <span class="n">grade</span> <span class="nb">TEXT</span><span class="p">,</span> + <span class="n">phone</span> <span class="nb">TEXT</span> +<span class="p">)</span> <span class="n">PARTITION</span> <span class="k">BY</span> <span class="k">COLUMN</span> <span class="p">(</span><span class="n">country</span> <span class="nb">TEXT</span><span class="p">,</span> <span class="n">city</span> <span class="nb">TEXT</span><span class="p">);</span> +</pre></div> +</div> +<p>And then you can get table information in Hive:</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="n">hive</span><span class="o">></span> <span class="k">desc</span> <span class="n">student</span><span class="p">;</span> +<span class="n">OK</span> +<span class="n">id</span> <span class="nb">int</span> +<span class="n">name</span> <span class="n">string</span> +<span class="n">gender</span> <span class="nb">char</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span> +<span class="n">grade</span> <span class="n">string</span> +<span class="n">phone</span> <span class="n">string</span> +<span class="n">country</span> <span class="n">string</span> +<span class="n">city</span> <span class="n">string</span> + +<span class="o">#</span> <span class="n">Partition</span> <span class="n">Information</span> +<span class="o">#</span> <span class="n">col_name</span> <span class="n">data_type</span> <span class="k">comment</span> + +<span class="n">country</span> <span class="n">string</span> +<span class="n">city</span> <span class="n">string</span> +</pre></div> +</div> +<p>Or as you create the table in Hive:</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="n">hive</span> <span class="o">></span> <span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">student</span> <span class="p">(</span> + <span class="n">id</span> <span class="nb">int</span><span class="p">,</span> + <span class="n">name</span> <span class="n">string</span><span class="p">,</span> + <span class="n">gender</span> <span class="nb">char</span><span class="p">(</span><span class="mi">1</span><span class="p">),</span> + <span class="n">grade</span> <span class="n">string</span><span class="p">,</span> + <span class="n">phone</span> <span class="n">string</span> +<span class="p">)</span> <span class="n">PARTITIONED</span> <span class="k">BY</span> <span class="p">(</span><span class="n">country</span> <span class="n">string</span><span class="p">,</span> <span class="n">city</span> <span class="n">string</span><span class="p">)</span> +<span class="k">ROW</span> <span class="n">FORMAT</span> <span class="n">DELIMITED</span> + <span class="n">FIELDS</span> <span class="n">TERMINATED</span> <span class="k">BY</span> <span class="s1">'|'</span> <span class="p">;</span> +</pre></div> +</div> +<p>You will see table information in Tajo:</p> +<div class="highlight-sql"><div class="highlight"><pre>default> \d student; +table name: default.student +table uri: hdfs://your_hdfs_namespace/user/hive/warehouse/student +store type: TEXT +number of rows: 0 +volume: 0 B +Options: + 'text.null'='\\N' + 'transient_lastDdlTime'='1438756422' + 'text.delimiter'='|' + +schema: +id INT4 +name TEXT +gender CHAR(1) +grade TEXT +phone TEXT + +Partitions: +type:COLUMN +columns::default.student.country (TEXT), default.student.city (TEXT) +</pre></div> +</div> +</div> +<div class="section" id="how-to-add-data-to-partition-table"> +<h3>How to add data to partition table<a class="headerlink" href="#how-to-add-data-to-partition-table" title="Permalink to this headline">¶</a></h3> +<p>In Tajo, you can add data dynamically to partition table of Hive with both <code class="docutils literal"><span class="pre">INSERT</span> <span class="pre">INTO</span> <span class="pre">...</span> <span class="pre">SELECT</span></code> and <code class="docutils literal"><span class="pre">Create</span> <span class="pre">Table</span> <span class="pre">As</span> <span class="pre">Select</span> <span class="pre">(CTAS)</span></code> statments. Tajo will automatically filter the data to HiveMetastore, create directories and move filtered data to appropriate directory on the distributed file system.</p> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="range_partitioning.html" class="btn btn-neutral float-right" title="Range Partitioning"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="intro_to_partitioning.html" class="btn btn-neutral" title="Introduction to Partitioning"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2015, Apache Tajo Team. + </p> + </div> + + <a href="https://github.com/snide/sphinx_rtd_theme";>Sphinx theme</a> provided by <a href="https://readthedocs.org";>Read the Docs</a> +</footer> + </div> + </div> + + </section> + + </div> + + + + + + <script type="text/javascript"> + var DOCUMENTATION_OPTIONS = { + URL_ROOT:'../', + VERSION:'0.11.0', + COLLAPSE_INDEX:false, + FILE_SUFFIX:'.html', + HAS_SOURCE: true + }; + </script> + <script type="text/javascript" src="../_static/jquery.js"></script> + <script type="text/javascript" src="../_static/underscore.js"></script> + <script type="text/javascript" src="../_static/doctools.js"></script> + + + + + + <script type="text/javascript" src="../_static/js/theme.js"></script> + + + + + <script type="text/javascript"> + jQuery(function () { + SphinxRtdTheme.StickyNav.enable(); + }); + </script> + + +</body> +</html> \ No newline at end of file
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headline">¶</a></h2> +<dl class="docutils"> +<dt>Tajo provides the following partitioning methods:</dt> +<dd><ul class="first last simple"> +<li>Column Partitioning</li> +<li>Range Partitioning (TODO)</li> +<li>Hash Partitioning (TODO)</li> +</ul> +</dd> +</dl> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="column_partitioning.html" class="btn btn-neutral float-right" title="Column Partitioning"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="../table_partitioning.html" class="btn btn-neutral" title="Table Partitioning"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2015, Apache Tajo Team. + </p> + </div> + + <a href="https://github.com/snide/sphinx_rtd_theme";>Sphinx theme</a> provided by <a href="https://readthedocs.org";>Read the Docs</a> +</footer> + </div> + </div> + + </section> + + 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