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class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#setting-the-classpath">Setting the CLASSPATH</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#connecting-to-the-tajo-cluster-instance">Connecting to the Tajo cluster instance</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#connection-parameters">Connection Parameters</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#an-example-jdbc-client">An Example JDBC Client</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../tajo_client_api.html">Tajo Client API</a></li> +<li class="toctree-l1"><a class="reference internal" href="../faq.html">FAQ</a></li> +</ul> + + + </div> + + </nav> + + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> + + + <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../index.html">Apache Tajo</a> + </nav> + + + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="breadcrumbs navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../index.html">Docs</a> »</li> + + <li><a href="../table_management.html">Table Management</a> »</li> + + <li>Tablespaces</li> + <li class="wy-breadcrumbs-aside"> + + <a href="../_sources/table_management/tablespaces.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + <div role="main"> + + <div class="section" id="tablespaces"> +<h1>Tablespaces<a class="headerlink" href="#tablespaces" title="Permalink to this headline">¶</a></h1> +<p>Tablespaces in Tajo allow users to define locations in the storage system where the files or data objects representing database objects can be stored. Once defined, a tablespace can be referred to by name when creating a database or a table. Especially, it is very useful when a Tajo cluster instance should use heterogeneous storage systems such as HDFS, MySQL, and Oracle.</p> +<div class="section" id="configuration"> +<h2>Configuration<a class="headerlink" href="#configuration" title="Permalink to this headline">¶</a></h2> +<p>By default, Tajo use in <code class="docutils literal"><span class="pre">${tajo.rootdir}/warehouse</span></code> in <code class="docutils literal"><span class="pre">conf/tajo-site.xml</span></code> as a default tablespace. It also allows users to register additional tablespaces.</p> +<p><code class="docutils literal"><span class="pre">conf/storage-site.json</span></code> file.</p> +<p>The configuration file has the following struct:</p> +<div class="highlight-json"><div class="highlight"><pre><span class="p">{</span> + <span class="nt">"spaces"</span><span class="p">:</span> <span class="p">{</span> + <span class="nt">"${table_space_name}"</span><span class="p">:</span> <span class="p">{</span> + <span class="nt">"uri"</span><span class="p">:</span> <span class="s2">"hbase://quorum1:port,quorum2:port/"</span> + <span class="p">}</span> + <span class="p">}</span> +<span class="p">}</span> +</pre></div> +</div> +<p>The following is an example for two tablespaces for hbase and hdfs:</p> +<div class="highlight-json"><div class="highlight"><pre><span class="p">{</span> + <span class="nt">"spaces"</span><span class="p">:</span> <span class="p">{</span> + <span class="nt">"hbase-cluster1"</span><span class="p">:</span> <span class="p">{</span> + <span class="nt">"uri"</span><span class="p">:</span> <span class="s2">"hbase://quorum1:port,quorum2:port/"</span> + <span class="p">},</span> + + <span class="nt">"ssd"</span><span class="p">:</span> <span class="p">{</span> + <span class="nt">"uri"</span><span class="p">:</span> <span class="s2">"hdfs://host:port/data/ssd"</span> + <span class="p">}</span> + <span class="p">}</span> +<span class="p">}</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Also, each tablespace can use different storage type. Please see <a class="reference internal" href="../storage_plugins.html"><em>Storage Plugin</em></a> if you want to know more information about it.</p> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="file_formats.html" class="btn btn-neutral float-right" title="File Formats"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="table_overview.html" class="btn btn-neutral" title="Overview of Tajo Tables"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014, 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
Added: tajo/site/docs/0.11.0/table_management/text.html URL: http://svn.apache.org/viewvc/tajo/site/docs/0.11.0/table_management/text.html?rev=1710773&view=auto ============================================================================== --- tajo/site/docs/0.11.0/table_management/text.html (added) +++ tajo/site/docs/0.11.0/table_management/text.html Tue Oct 27 11:04:33 2015 @@ -0,0 +1,375 @@ + + +<!DOCTYPE html> +<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> +<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + + <title>TEXT — Apache Tajo 0.11.0 documentation</title> + + + + + + + <link href='https://fonts.googleapis.com/css?family=Lato:400,700|Roboto+Slab:400,700|Inconsolata:400,700' rel='stylesheet' type='text/css'> + + + + + + + + + + <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" /> + + + + <link rel="top" 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+<li class="toctree-l2"><a class="reference internal" href="../time_zone.html#time-zone-id">Time Zone ID</a></li> +<li class="toctree-l2"><a class="reference internal" href="../time_zone.html#examples-of-time-zone">Examples of Time Zone</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../functions.html">Functions</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../functions.html#built-in-scalar-functions">Built-in Scalar Functions</a></li> +<li class="toctree-l2"><a class="reference internal" href="../functions.html#built-in-aggregation-functions">Built-in Aggregation Functions</a></li> +<li class="toctree-l2"><a class="reference internal" href="../functions.html#built-in-window-functions">Built-in Window Functions</a></li> +<li class="toctree-l2"><a class="reference internal" href="../functions.html#user-defined-functions">User-defined Functions</a></li> +</ul> +</li> +<li class="toctree-l1 current"><a class="reference internal" href="../table_management.html">Table Management</a><ul class="current"> +<li class="toctree-l2"><a class="reference internal" href="table_overview.html">Overview of Tajo Tables</a></li> +<li class="toctree-l2"><a class="reference internal" href="tablespaces.html">Tablespaces</a></li> +<li class="toctree-l2 current"><a class="reference internal" href="file_formats.html">File Formats</a></li> +<li class="toctree-l2"><a class="reference internal" href="compression.html">Compression</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../table_partitioning.html">Table Partitioning</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../partitioning/intro_to_partitioning.html">Introduction to Partitioning</a></li> +<li class="toctree-l2"><a class="reference internal" href="../partitioning/column_partitioning.html">Column Partitioning</a></li> +<li class="toctree-l2"><a class="reference internal" href="../partitioning/range_partitioning.html">Range Partitioning</a></li> +<li class="toctree-l2"><a class="reference internal" href="../partitioning/hash_partitioning.html">Hash Partitioning</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../storage_plugins.html">Storage Plugin</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../storage_plugins/overview.html">Storage Plugin Overview</a></li> +<li class="toctree-l2"><a class="reference internal" href="../storage_plugins/postgresql.html">PostgreSQL Storage Handler</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../index_overview.html">Index (Experimental Feature)</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../index/types.html">Index Types</a></li> +<li class="toctree-l2"><a class="reference internal" href="../index/how_to_use.html">How to use index?</a></li> +<li class="toctree-l2"><a class="reference internal" href="../index/future_work.html">Future Works</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../backup_and_restore.html">Backup and Restore</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../backup_and_restore/catalog.html">Backup and Restore Catalog</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../hive_integration.html">Hive Integration</a></li> +<li class="toctree-l1"><a class="reference internal" href="../hbase_integration.html">HBase Integration</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../hbase_integration.html#create-table">CREATE TABLE</a></li> +<li class="toctree-l2"><a class="reference internal" href="../hbase_integration.html#drop-table">DROP TABLE</a></li> +<li class="toctree-l2"><a class="reference internal" href="../hbase_integration.html#insert-overwrite-into">INSERT (OVERWRITE) INTO</a></li> +<li class="toctree-l2"><a class="reference internal" href="../hbase_integration.html#usage">Usage</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../swift_integration.html">OpenStack Swift Integration</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../swift_integration.html#swift-configuration">Swift configuration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../swift_integration.html#hadoop-configurations">Hadoop configurations</a></li> +<li class="toctree-l2"><a class="reference internal" href="../swift_integration.html#tajo-configuration">Tajo configuration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../swift_integration.html#querying-on-swift">Querying on Swift</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../jdbc_driver.html">Tajo JDBC Driver</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#how-to-get-jdbc-driver">How to get JDBC driver</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#setting-the-classpath">Setting the CLASSPATH</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#connecting-to-the-tajo-cluster-instance">Connecting to the Tajo cluster instance</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#connection-parameters">Connection Parameters</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#an-example-jdbc-client">An Example JDBC Client</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../tajo_client_api.html">Tajo Client API</a></li> +<li class="toctree-l1"><a class="reference internal" href="../faq.html">FAQ</a></li> +</ul> + + + </div> + + </nav> + + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> + + + <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../index.html">Apache Tajo</a> + </nav> + + + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="breadcrumbs navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../index.html">Docs</a> »</li> + + <li><a href="../table_management.html">Table Management</a> »</li> + + <li><a href="file_formats.html">File Formats</a> »</li> + + <li>TEXT</li> + <li class="wy-breadcrumbs-aside"> + + <a href="../_sources/table_management/text.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + <div role="main"> + + <div class="section" id="text"> +<h1>TEXT<a class="headerlink" href="#text" title="Permalink to this headline">¶</a></h1> +<p>A character-separated values plain text file represents a tabular data set consisting of rows and columns. +Each row is a plain text line. A line is usually broken by a character line feed <code class="docutils literal"><span class="pre">\n</span></code> or carriage-return <code class="docutils literal"><span class="pre">\r</span></code>. +The line feed <code class="docutils literal"><span class="pre">\n</span></code> is the default delimiter in Tajo. Each record consists of multiple fields, separated by +some other character or string, most commonly a literal vertical bar <code class="docutils literal"><span class="pre">|</span></code>, comma <code class="docutils literal"><span class="pre">,</span></code> or tab <code class="docutils literal"><span class="pre">\t</span></code>. +The vertical bar is used as the default field delimiter in Tajo.</p> +<div class="section" id="how-to-create-a-text-table"> +<h2>How to Create a TEXT Table ?<a class="headerlink" href="#how-to-create-a-text-table" title="Permalink to this headline">¶</a></h2> +<p>If you are not familiar with the <code class="docutils literal"><span class="pre">CREATE</span> <span class="pre">TABLE</span></code> statement, please refer to the Data Definition Language <a class="reference internal" href="../sql_language/ddl.html"><em>Data Definition Language</em></a>.</p> +<p>In order to specify a certain file format for your table, you need to use the <code class="docutils literal"><span class="pre">USING</span></code> clause in your <code class="docutils literal"><span class="pre">CREATE</span> <span class="pre">TABLE</span></code> +statement. The below is an example statement for creating a table using <em>TEXT</em> format.</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">CREATE</span> <span class="k">TABLE</span> + <span class="n">table1</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">score</span> <span class="nb">float</span><span class="p">,</span> + <span class="k">type</span> <span class="nb">text</span> + <span class="p">)</span> <span class="k">USING</span> <span class="nb">TEXT</span><span class="p">;</span> +</pre></div> +</div> +</div> +<div class="section" id="physical-properties"> +<h2>Physical Properties<a class="headerlink" href="#physical-properties" title="Permalink to this headline">¶</a></h2> +<p>Some table storage formats provide parameters for enabling or disabling features and adjusting physical parameters. +The <code class="docutils literal"><span class="pre">WITH</span></code> clause in the CREATE TABLE statement allows users to set those parameters.</p> +<p><em>TEXT</em> format provides the following physical properties.</p> +<ul class="simple"> +<li><code class="docutils literal"><span class="pre">text.delimiter</span></code>: delimiter character. <code class="docutils literal"><span class="pre">|</span></code> or <code class="docutils literal"><span class="pre">\u0001</span></code> is usually used, and the default field delimiter is <code class="docutils literal"><span class="pre">|</span></code>.</li> +<li><code class="docutils literal"><span class="pre">text.null</span></code>: <code class="docutils literal"><span class="pre">NULL</span></code> character. The default <code class="docutils literal"><span class="pre">NULL</span></code> character is an empty string <code class="docutils literal"><span class="pre">''</span></code>. Hive’s default <code class="docutils literal"><span class="pre">NULL</span></code> character is <code class="docutils literal"><span class="pre">'\\N'</span></code>.</li> +<li><code class="docutils literal"><span class="pre">compression.codec</span></code>: Compression codec. You can enable compression feature and set specified compression algorithm. The compression algorithm used to compress files. The compression codec name should be the fully qualified class name inherited from <a class="reference external" href="https://hadoop.apache.org/docs/current/api/org/apache/hadoop/io/compress/CompressionCodec.html";>org.apache.hadoop.io.compress.CompressionCodec</a>. By default, compression is disabled.</li> +<li><code class="docutils literal"><span class="pre">text.serde</span></code>: custom (De)serializer class. <code class="docutils literal"><span class="pre">org.apache.tajo.storage.text.CSVLineSerDe</span></code> is the default (De)serializer class.</li> +<li><code class="docutils literal"><span class="pre">timezone</span></code>: the time zone that the table uses for writting. When table rows are read or written, <code class="docutils literal"><span class="pre">`timestamp`</span></code> and <code class="docutils literal"><span class="pre">`time`</span></code> column values are adjusted by this timezone if it is set. Time zone can be an abbreviation form like ‘PST’ or ‘DST’. Also, it accepts an offset-based form like ‘UTC+9’ or a location-based form like ‘Asia/Seoul’.</li> +<li><code class="docutils literal"><span class="pre">text.error-tolerance.max-num</span></code>: the maximum number of permissible parsing errors. This value should be an integer value. By default, <code class="docutils literal"><span class="pre">text.error-tolerance.max-num</span></code> is <code class="docutils literal"><span class="pre">0</span></code>. According to the value, parsing errors will be handled in different ways.<ul> +<li>If <code class="docutils literal"><span class="pre">text.error-tolerance.max-num</span> <span class="pre"><</span> <span class="pre">0</span></code>, all parsing errors are ignored.</li> +<li>If <code class="docutils literal"><span class="pre">text.error-tolerance.max-num</span> <span class="pre">==</span> <span class="pre">0</span></code>, any parsing error is not allowed. If any error occurs, the query will be failed. (default)</li> +<li>If <code class="docutils literal"><span class="pre">text.error-tolerance.max-num</span> <span class="pre">></span> <span class="pre">0</span></code>, the given number of parsing errors in each task will be pemissible.</li> +</ul> +</li> +<li><code class="docutils literal"><span class="pre">text.skip.headerlines</span></code>: Number of header lines to be skipped. Some text files often have a header which has a kind of metadata(e.g.: column names), thus this option can be useful.</li> +</ul> +<p>The following example is to set a custom field delimiter, <code class="docutils literal"><span class="pre">NULL</span></code> character, and compression codec:</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">table1</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">score</span> <span class="nb">float</span><span class="p">,</span> + <span class="k">type</span> <span class="nb">text</span> +<span class="p">)</span> <span class="k">USING</span> <span class="nb">TEXT</span> <span class="k">WITH</span><span class="p">(</span><span class="s1">'text.delimiter'</span><span class="o">=</span><span class="s1">'\u0001'</span><span class="p">,</span> + <span class="s1">'text.null'</span><span class="o">=</span><span class="s1">'\\N'</span><span class="p">,</span> + <span class="s1">'compression.codec'</span><span class="o">=</span><span class="s1">'org.apache.hadoop.io.compress.SnappyCodec'</span><span class="p">);</span> +</pre></div> +</div> +<div class="admonition warning"> +<p class="first admonition-title">Warning</p> +<p class="last">Be careful when using <code class="docutils literal"><span class="pre">\n</span></code> as the field delimiter because <em>TEXT</em> format tables use <code class="docutils literal"><span class="pre">\n</span></code> as the line delimiter. +At the moment, Tajo does not provide a way to specify the line delimiter.</p> +</div> +</div> +<div class="section" id="custom-de-serializer"> +<h2>Custom (De)serializer<a class="headerlink" href="#custom-de-serializer" title="Permalink to this headline">¶</a></h2> +<p>The <em>TEXT</em> format not only provides reading and writing interfaces for text data but also allows users to process custom +plain text file formats with user-defined (De)serializer classes. +With custom (de)serializers, Tajo can process any text files no matter which the internal structure is.</p> +<p>In order to specify a custom (De)serializer, set a physical property <code class="docutils literal"><span class="pre">text.serde</span></code>. +The property value should be a fully qualified class name.</p> +<p>For example:</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">table1</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">score</span> <span class="nb">float</span><span class="p">,</span> + <span class="k">type</span> <span class="nb">text</span> +<span class="p">)</span> <span class="k">USING</span> <span class="nb">TEXT</span> <span class="k">WITH</span> <span class="p">(</span><span class="s1">'text.serde'</span><span class="o">=</span><span class="s1">'org.my.storage.CustomSerializerDeserializer'</span><span class="p">)</span> +</pre></div> +</div> +</div> +<div class="section" id="null-value-handling-issues"> +<h2>Null Value Handling Issues<a class="headerlink" href="#null-value-handling-issues" title="Permalink to this headline">¶</a></h2> +<p>In default, <code class="docutils literal"><span class="pre">NULL</span></code> character in <em>TEXT</em> format is an empty string <code class="docutils literal"><span class="pre">''</span></code>. +In other words, an empty field is basically recognized as a <code class="docutils literal"><span class="pre">NULL</span></code> value in Tajo. +If a field domain is <code class="docutils literal"><span class="pre">TEXT</span></code>, an empty field is recognized as a string value <code class="docutils literal"><span class="pre">''</span></code> instead of <code class="docutils literal"><span class="pre">NULL</span></code> value. +Besides, You can also use your own <code class="docutils literal"><span class="pre">NULL</span></code> character by specifying a physical property <code class="docutils literal"><span class="pre">text.null</span></code>.</p> +</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><em>TEXT</em> tables generated in Tajo can be processed directly by Apache Hive⢠without further processing. +In this section, we explain some compatibility issue for users who use both Hive and Tajo.</p> +<p>If you set a custom field delimiter, the <em>TEXT</em> tables cannot be directly used in Hive. +In order to specify the custom field delimiter in Hive, you need to use <code class="docutils literal"><span class="pre">ROW</span> <span class="pre">FORMAT</span> <span class="pre">DELIMITED</span> <span class="pre">FIELDS</span> <span class="pre">TERMINATED</span> <span class="pre">BY</span></code> +clause in a Hive’s <code class="docutils literal"><span class="pre">CREATE</span> <span class="pre">TABLE</span></code> statement as follows:</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">table1</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">score</span> <span class="nb">float</span><span class="p">,</span> <span class="k">type</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="n">STORED</span> <span class="k">AS</span> <span class="nb">TEXT</span> +</pre></div> +</div> +<p>To the best of our knowledge, there is not way to specify a custom <code class="docutils literal"><span class="pre">NULL</span></code> character in Hive.</p> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="json.html" class="btn btn-neutral float-right" title="JSON"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="file_formats.html" class="btn btn-neutral" title="File Formats"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014, 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> 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