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href="../tsql/intro.html">Introducing to TSQL</a></li> +<li class="toctree-l2"><a class="reference internal" href="../tsql/single_command.html">Executing a single command</a></li> +<li class="toctree-l2"><a class="reference internal" href="../tsql/execute_file.html">Executing Queries from Files</a></li> +<li class="toctree-l2"><a class="reference internal" href="../tsql/background_command.html">Executing as background process</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../sql_language.html">SQL Language</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/data_model.html">Data Model</a></li> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/ddl.html">Data Definition Language</a></li> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/insert.html">INSERT (OVERWRITE) INTO</a></li> +<li class="toctree-l2"><a class="reference internal" 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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/math_func_and_operators.html">Math Functions and Operators</a></li> +<li class="toctree-l2"><a class="reference internal" href="../functions/string_func_and_operators.html">String Functions and Operators</a></li> +<li class="toctree-l2"><a class="reference internal" href="../functions/datetime_func_and_operators.html">DateTime Functions and Operators</a></li> +<li class="toctree-l2"><a class="reference internal" href="../functions/network_func_and_operators.html">Network Functions and Operators</a></li> +<li class="toctree-l2"><a class="reference internal" href="../functions/json_func.html">JSON 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 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="../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="../hcatalog_integration.html">HCatalog 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#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 plan-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. +* 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. +* 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) +* 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> +<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 +plan-text file formats with user-defined (De)serializer classes. +For example, with custom (de)serializers, Tajo can process JSON file formats or any specialized plan-text file formats.</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="rcfile.html" class="btn btn-neutral float-right" title="RCFile"/>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 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<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>Time Zone</li> + <li class="wy-breadcrumbs-aside"> + + <a href="_sources/time_zone.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + <div role="main"> + + <div class="section" id="time-zone"> +<h1>Time Zone<a class="headerlink" href="#time-zone" title="Permalink to this headline">¶</a></h1> +<p>Time zone affects some data types (e.g., <code class="docutils literal"><span class="pre">Timestamp</span></code> and <code class="docutils literal"><span class="pre">Time</span></code>) and operations (e.g., <code class="docutils literal"><span class="pre">to_char</span></code>). Tables can have different time zones. Internally, Tajo translates all table rows to UTC values and processes them. It becomes easier for Tajo to handle multiple different time zones.</p> +<p>In Tajo, there are some time zong settings.</p> +<div class="section" id="server-cluster-time-zone"> +<h2>Server Cluster Time Zone<a class="headerlink" href="#server-cluster-time-zone" title="Permalink to this headline">¶</a></h2> +<p>One Tajo cluster has a system time zone which globally affects all tables in which the table property ‘time zone’ are not specified.</p> +<p>You can set the system time zone in <em>conf/tajo-site.xml</em> file as follows:</p> +<p><strong>tajo-site.xml</strong></p> +<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><name></span>tajo.timezone<span class="nt"></name></span> +<span class="nt"><property></span>GMT+9<span class="nt"></property></span> +</pre></div> +</div> +</div> +<div class="section" id="table-time-zone"> +<h2>Table Time Zone<a class="headerlink" href="#table-time-zone" title="Permalink to this headline">¶</a></h2> +<p>In Tajo, a table property <code class="docutils literal"><span class="pre">timezone</span></code> allows users to specify a time zone that the table uses for reading or writing. +When each table row 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 a given time zone if it is set.</p> +<p>You can specify a table time zone as follows:</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">CREATE</span> <span class="k">EXTERNAL</span> <span class="k">TABLE</span> <span class="n">table1</span> <span class="p">(</span> + <span class="n">t_timestamp</span> <span class="k">TIMESTAMP</span><span class="p">,</span> + <span class="n">t_date</span> <span class="nb">DATE</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">'timezone'</span><span class="o">=</span><span class="s1">'ASIA/Seoul'</span><span class="p">)</span> <span class="k">LOCATION</span> <span class="s1">'/path-to-table/'</span> +</pre></div> +</div> +<p>In order to learn table properties, please refer to <a class="reference internal" href="table_management/table_overview.html"><em>Overview of Tajo Tables</em></a>.</p> +</div> +<div class="section" id="client-time-zone"> +<h2>Client Time Zone<a class="headerlink" href="#client-time-zone" title="Permalink to this headline">¶</a></h2> +<p>Each client has its own time zone setting. It translates retrieved timestamp and time values by time zone. In order to set client time zone, you should set the session variable <code class="docutils literal"><span class="pre">TIMEZONE</span></code>. There are some ways to set this session variable.</p> +<p>In <code class="docutils literal"><span class="pre">tsql</span></code>, you can use <code class="docutils literal"><span class="pre">\set</span> <span class="pre">timezone</span></code> meta command as follows:</p> +<p><strong>tsql</strong></p> +<div class="highlight-sh"><div class="highlight"><pre>default> <span class="se">\s</span>et timezone GMT+9 +</pre></div> +</div> +<p>The following ways use SQL statements. So, this way is available in <code class="docutils literal"><span class="pre">tsql</span></code>, JDBC, and Tajo Java API.</p> +<p><strong>SQL</strong></p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">SET</span> <span class="n">TIME</span> <span class="k">ZONE</span> <span class="s1">'GMT+9'</span><span class="p">;</span> + +<span class="k">or</span> + +<span class="k">SET</span> <span class="k">SESSION</span> <span class="n">TIMEZONE</span> <span class="k">TO</span> <span class="s1">'GMT+9'</span><span class="p">;</span> +</pre></div> +</div> +</div> +<div class="section" id="time-zone-id"> +<h2>Time Zone ID<a class="headerlink" href="#time-zone-id" title="Permalink to this headline">¶</a></h2> +<p>Time zone can be an abbreviation form like ‘PST’ or ‘DST’. Also, it accepts an offset-based form like ‘GMT+9’ or UTC+9’ or a location-based form like ‘Asia/Seoul’.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">In many cases, offset-based forms or locaion-based forms are recommanded. In order to know the list of time zones, please refer to <a class="reference external" href="http://en.wikipedia.org/wiki/List_of_tz_database_time_zones";>List of tz database time zones</a></p> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Java 6 does not recognize many location-based time zones and an offset-based timezone using the prefix ‘UTC’. We highly recommanded using the offset-based time zone using the prefix ‘GMT’. In other words, you should use ‘GMT-7’ instead of ‘UTC-7’ in Java 6.</p> +</div> +</div> +<div class="section" id="examples-of-time-zone"> +<h2>Examples of Time Zone<a class="headerlink" href="#examples-of-time-zone" title="Permalink to this headline">¶</a></h2> +<p>For example, consider that there is a list of delimited text lines where each rows are written with <code class="docutils literal"><span class="pre">Asia/Seoul</span></code> time zone (i.e., GMT + 9).</p> +<div class="highlight-text"><div class="highlight"><pre>1980-4-1 01:50:30.010|1980-04-01 +80/4/1 1:50:30 AM|80/4/1 +1980 April 1 1:50:30|1980-04-01 +</pre></div> +</div> +<p>In order to register the table, we should put a table property <code class="docutils literal"><span class="pre">'timezone'='Asia/Seoul'</span></code> in <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">EXTERNAL</span> <span class="k">TABLE</span> <span class="n">table1</span> <span class="p">(</span> + <span class="n">t_timestamp</span> <span class="k">TIMESTAMP</span><span class="p">,</span> + <span class="n">t_date</span> <span class="nb">DATE</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">'|'</span><span class="p">,</span> <span class="s1">'timezone'</span><span class="o">=</span><span class="s1">'ASIA/Seoul'</span><span class="p">)</span> <span class="k">LOCATION</span> <span class="s1">'/path-to-table/'</span> +</pre></div> +</div> +<p>By default, <code class="docutils literal"><span class="pre">tsql</span></code> and <code class="docutils literal"><span class="pre">TajoClient</span></code> API use UTC time zone. So, timestamp values in the result are adjusted by the time zone offset. But, date is not adjusted because date type does not consider time zone.</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">default</span><span class="o">></span> <span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">table1</span> +<span class="n">t_timestamp</span><span class="p">,</span> <span class="n">t_date</span> +<span class="c1">----------------------------------</span> +<span class="mi">1980</span><span class="o">-</span><span class="mi">03</span><span class="o">-</span><span class="mi">31</span> <span class="mi">16</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">30</span><span class="p">.</span><span class="mi">01</span><span class="p">,</span> <span class="mi">1980</span><span class="o">-</span><span class="mi">04</span><span class="o">-</span><span class="mi">01</span> +<span class="mi">1980</span><span class="o">-</span><span class="mi">03</span><span class="o">-</span><span class="mi">31</span> <span class="mi">16</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">30</span> <span class="p">,</span> <span class="mi">1980</span><span class="o">-</span><span class="mi">04</span><span class="o">-</span><span class="mi">01</span> +<span class="mi">1980</span><span class="o">-</span><span class="mi">03</span><span class="o">-</span><span class="mi">31</span> <span class="mi">16</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">30</span> <span class="p">,</span> <span class="mi">1980</span><span class="o">-</span><span class="mi">04</span><span class="o">-</span><span class="mi">01</span> +</pre></div> +</div> +<p>In addition, users can set client-side time zone by setting a session variable ‘TZ’. It enables a client to translate timestamp or time values to user’s time zoned ones.</p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">default</span><span class="o">></span> <span class="k">SET</span> <span class="n">TIME</span> <span class="k">ZONE</span> <span class="s1">'Asia/Seoul'</span> +<span class="k">default</span><span class="o">></span> <span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">table1</span> +<span class="n">t_timestamp</span><span class="p">,</span> <span class="n">t_date</span> +<span class="c1">----------------------------------</span> +<span class="mi">1980</span><span class="o">-</span><span class="mi">04</span><span class="o">-</span><span class="mi">01</span> <span class="mi">01</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">30</span><span class="p">.</span><span class="mi">01</span><span class="p">,</span> <span class="mi">1980</span><span class="o">-</span><span class="mi">04</span><span class="o">-</span><span class="mi">01</span> +<span class="mi">1980</span><span class="o">-</span><span class="mi">04</span><span class="o">-</span><span class="mi">01</span> <span class="mi">01</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">30</span> <span class="p">,</span> <span class="mi">1980</span><span class="o">-</span><span class="mi">04</span><span class="o">-</span><span class="mi">01</span> +<span class="mi">1980</span><span class="o">-</span><span class="mi">04</span><span class="o">-</span><span class="mi">01</span> <span class="mi">01</span><span class="p">:</span><span class="mi">50</span><span class="p">:</span><span class="mi">30</span> <span class="p">,</span> <span class="mi">1980</span><span class="o">-</span><span class="mi">04</span><span class="o">-</span><span class="mi">01</span> +</pre></div> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="functions.html" class="btn btn-neutral float-right" title="Functions"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="sql_language/predicates.html" class="btn btn-neutral" title="Predicates"><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
