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title="Permalink to this definition">¶</a></dt> +<dd><p>Returns the first value of input rows.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>value</strong> – input value</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">same as parameter data type</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="function"> +<dt id="last_value"> +<code class="descname">last_value</code><span class="sig-paren">(</span><em>value any</em><span class="sig-paren">)</span><a class="headerlink" href="#last_value" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns the last value of input rows.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>value</strong> – input value</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">same as parameter data type</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="function"> +<dt id="lag"> +<code class="descname">lag</code><span class="sig-paren">(</span><em>value any</em><span class="optional">[</span>, <em>offset integer</em><span class="optional">[</span>, <em>default any</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#lag" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns value evaluated at the row that is offset rows before the current row within the partition. If there is no such row, instead return default. Both offset and default are evaluated with respect to the current row. If omitted, offset defaults to 1 and default to null.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>value</strong> – input value</li> +<li><strong>offset</strong> – offset</li> +<li><strong>default</strong> – default value</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">same as parameter data type</p> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="function"> +<dt id="lead"> +<code class="descname">lead</code><span class="sig-paren">(</span><em>value any</em><span class="optional">[</span>, <em>offset integer</em><span class="optional">[</span>, <em>default any</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#lead" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns value evaluated at the row that is offset rows after the current row within the partition. If there is no such row, instead return default. Both offset and default are evaluated with respect to the current row. If omitted, offset defaults to 1 and default to null.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>value</strong> – input value</li> +<li><strong>offset</strong> – offset</li> +<li><strong>default</strong> – default value</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">same as parameter data type</p> +</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="function"> +<dt id="rank"> +<code class="descname">rank</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#rank" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns rank of the current row with gaps.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">int8</td> +</tr> +</tbody> +</table> +</dd></dl> + +<dl class="function"> +<dt id="row_number"> +<code class="descname">row_number</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#row_number" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns the current row within its partition, counting from 1.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">int8</td> +</tr> +</tbody> +</table> +</dd></dl> + +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="python.html" class="btn btn-neutral float-right" title="Python Functions"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="agg_func.html" class="btn btn-neutral" title="Aggregation Functions"><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
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class="reference internal" href="configuration/tajo-site-xml.html">The tajo-site.xml File</a></li> +<li class="toctree-l2"><a class="reference internal" href="configuration/catalog-site-xml.html">The catalog-site.xml File</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="tsql.html">Tajo Shell (TSQL)</a><ul> +<li class="toctree-l2"><a class="reference internal" href="tsql/meta_command.html">Meta Commands</a></li> +<li class="toctree-l2"><a class="reference internal" href="tsql/dfs_command.html">Executing HDFS commands</a></li> +<li class="toctree-l2"><a class="reference internal" href="tsql/variables.html">Session Variables</a></li> +<li class="toctree-l2"><a class="reference internal" href="tsql/admin_command.html">Administration Commands</a></li> +<li class="toctree-l2"><a class="reference internal" 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" href="sql_language/alter_table.html">ALTER TABLE</a></li> +<li class="toctree-l2"><a class="reference internal" href="sql_language/queries.html">Queries</a></li> +<li class="toctree-l2"><a class="reference internal" href="sql_language/joins.html">Joins</a></li> +<li class="toctree-l2"><a class="reference internal" href="sql_language/sql_expression.html">SQL Expressions</a></li> +<li class="toctree-l2"><a class="reference internal" href="sql_language/predicates.html">Predicates</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="time_zone.html">Time Zone</a><ul> +<li class="toctree-l2"><a class="reference internal" href="time_zone.html#server-cluster-time-zone">Server Cluster Time Zone</a></li> +<li class="toctree-l2"><a class="reference internal" href="time_zone.html#table-time-zone">Table Time Zone</a></li> +<li class="toctree-l2"><a class="reference internal" href="time_zone.html#client-time-zone">Client Time Zone</a></li> +<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"><a class="reference internal" href="table_management.html">Table Management</a><ul> +<li class="toctree-l2"><a class="reference internal" href="table_management/table_overview.html">Overview of Tajo Tables</a></li> +<li class="toctree-l2"><a class="reference internal" href="table_management/tablespaces.html">Tablespaces</a></li> +<li class="toctree-l2"><a class="reference internal" href="table_management/file_formats.html">File Formats</a></li> +<li class="toctree-l2"><a class="reference internal" href="table_management/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 current"><a class="current reference internal" href="">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>Hive Integration</li> + <li class="wy-breadcrumbs-aside"> + + <a href="_sources/hive_integration.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + <div role="main"> + + <div class="section" id="hive-integration"> +<h1>Hive Integration<a class="headerlink" href="#hive-integration" title="Permalink to this headline">¶</a></h1> +<p>Apache Tajo⢠catalog supports HiveCatalogStore to integrate with Apache Hiveâ¢. +This integration allows Tajo to access all tables used in Apache Hive. +Depending on your purpose, you can execute either SQL queries or HiveQL queries on the +same tables managed in Apache Hive.</p> +<p>In order to use this feature, you need to build Tajo with a specified maven profile +and then add some configs into <code class="docutils literal"><span class="pre">conf/tajo-env.sh</span></code> and <code class="docutils literal"><span class="pre">conf/catalog-site.xml</span></code>. +This section describes how to setup HiveMetaStore integration. +This instruction would take no more than five minutes.</p> +<p>You need to set your Hive home directory to the environment variable <code class="docutils literal"><span class="pre">HIVE_HOME</span></code> in conf/tajo-env.sh as follows:</p> +<div class="highlight-python"><div class="highlight"><pre>export HIVE_HOME=/path/to/your/hive/directory +</pre></div> +</div> +<p>If you need to use jdbc to connect HiveMetaStore, you have to prepare MySQL jdbc driver. +Next, you should set the path of MySQL JDBC driver jar file to the environment variable HIVE_JDBC_DRIVER_DIR in conf/tajo-env.sh as follows:</p> +<div class="highlight-python"><div class="highlight"><pre>export HIVE_JDBC_DRIVER_DIR==/path/to/your/mysql_jdbc_driver/mysql-connector-java-x.x.x-bin.jar +</pre></div> +</div> +<p>Finally, you should specify HiveCatalogStore as Tajo catalog driver class in <code class="docutils literal"><span class="pre">conf/catalog-site.xml</span></code> as follows:</p> +<div class="highlight-python"><div class="highlight"><pre><property> + <name>tajo.catalog.store.class</name> + <value>org.apache.tajo.catalog.store.HiveCatalogStore</value> +</property> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p>Hive stores a list of partitions for each table in its metastore. If new partitions are +directly added to HDFS, HiveMetastore will not able aware of these partitions unless the user +<code class="docutils literal"><span class="pre">ALTER</span> <span class="pre">TABLE</span> <span class="pre">table_name</span> <span class="pre">ADD</span> <span class="pre">PARTITION</span></code> commands on each of the newly added partitions or +<code class="docutils literal"><span class="pre">MSCK</span> <span class="pre">REPAIR</span> <span class="pre">TABLE</span> <span class="pre">table_name</span></code> command.</p> +<p>But current tajo doesn’t provide <code class="docutils literal"><span class="pre">ADD</span> <span class="pre">PARTITION</span></code> command and hive doesn’t provide an api for +responding to <code class="docutils literal"><span class="pre">MSK</span> <span class="pre">REPAIR</span> <span class="pre">TABLE</span></code> command. Thus, if you insert data to hive partitioned +table and you want to scan the updated partitions through Tajo, you must run following command on hive</p> +<div class="last highlight-python"><div class="highlight"><pre>$ MSCK REPAIR TABLE [table_name]; +</pre></div> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="hbase_integration.html" class="btn btn-neutral float-right" title="HBase Integration"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="backup_and_restore/catalog.html" class="btn btn-neutral" title="Backup and Restore Catalog"><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> 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tajo/site/docs/current/sql_language/alter_table.html Tue Oct 27 11:04:33 2015 @@ -0,0 +1,350 @@ + + +<!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>ALTER TABLE — 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" title="Apache Tajo 0.11.0 documentation" href="../index.html"/> + <link rel="up" title="SQL Language" href="../sql_language.html"/> + <link rel="next" title="Queries" href="queries.html"/> + <link rel="prev" title="INSERT (OVERWRITE) INTO" href="insert.html"/> + + + <script 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class="toctree-l2"><a class="reference internal" href="../getting_started.html#prerequisites">Prerequisites</a></li> +<li class="toctree-l2"><a class="reference internal" href="../getting_started.html#dowload-and-unpack-the-source-code">Dowload and unpack the source code</a></li> +<li class="toctree-l2"><a class="reference internal" href="../getting_started.html#build-source-code">Build source code</a></li> +<li class="toctree-l2"><a class="reference internal" href="../getting_started.html#setting-up-a-local-tajo-cluster">Setting up a local Tajo cluster</a></li> +<li class="toctree-l2"><a class="reference internal" href="../getting_started.html#first-query-execution">First query execution</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../configuration.html">Configuration</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../configuration/preliminary.html">Preliminary</a></li> +<li class="toctree-l2"><a class="reference internal" href="../configuration/cluster_setup.html">Cluster Setup</a></li> +<li class="toctree-l2"><a class="reference internal" href="../configuration/tajo_master_configuration.html">Tajo Master Configuration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../configuration/worker_configuration.html">Worker Configuration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../configuration/catalog_configuration.html">Catalog Configuration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../configuration/ha_configuration.html">High Availability for TajoMaster</a></li> +<li class="toctree-l2"><a class="reference internal" href="../configuration/service_config_defaults.html">Cluster Service Configuration Defaults</a></li> +<li class="toctree-l2"><a class="reference internal" href="../configuration/tajo-site-xml.html">The tajo-site.xml File</a></li> +<li class="toctree-l2"><a class="reference internal" href="../configuration/catalog-site-xml.html">The catalog-site.xml File</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../tsql.html">Tajo Shell (TSQL)</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../tsql/meta_command.html">Meta Commands</a></li> +<li class="toctree-l2"><a class="reference internal" href="../tsql/dfs_command.html">Executing HDFS commands</a></li> +<li class="toctree-l2"><a class="reference internal" href="../tsql/variables.html">Session Variables</a></li> +<li class="toctree-l2"><a class="reference internal" href="../tsql/admin_command.html">Administration Commands</a></li> +<li class="toctree-l2"><a class="reference internal" 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 current"><a class="reference internal" href="../sql_language.html">SQL Language</a><ul class="current"> +<li class="toctree-l2"><a class="reference internal" href="data_model.html">Data Model</a></li> +<li class="toctree-l2"><a class="reference internal" href="ddl.html">Data Definition Language</a></li> +<li class="toctree-l2"><a class="reference internal" href="insert.html">INSERT (OVERWRITE) INTO</a></li> +<li class="toctree-l2 current"><a class="current reference internal" href="">ALTER TABLE</a></li> +<li class="toctree-l2"><a class="reference internal" href="queries.html">Queries</a></li> +<li class="toctree-l2"><a class="reference internal" href="joins.html">Joins</a></li> +<li class="toctree-l2"><a class="reference internal" href="sql_expression.html">SQL Expressions</a></li> +<li class="toctree-l2"><a class="reference internal" href="predicates.html">Predicates</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../time_zone.html">Time Zone</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../time_zone.html#server-cluster-time-zone">Server Cluster Time Zone</a></li> +<li class="toctree-l2"><a class="reference internal" href="../time_zone.html#table-time-zone">Table Time Zone</a></li> +<li class="toctree-l2"><a class="reference internal" href="../time_zone.html#client-time-zone">Client Time Zone</a></li> +<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" 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<li class="wy-breadcrumbs-aside"> + + <a href="../_sources/sql_language/alter_table.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + <div role="main"> + + <div class="section" id="alter-table"> +<h1>ALTER TABLE<a class="headerlink" href="#alter-table" title="Permalink to this headline">¶</a></h1> +<div class="section" id="rename-table"> +<h2>RENAME TABLE<a class="headerlink" href="#rename-table" title="Permalink to this headline">¶</a></h2> +<p><em>Synopsis</em></p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="o"><</span><span class="k">table_name</span><span class="o">></span> <span class="k">RENAME</span> <span class="k">TO</span> <span class="o"><</span><span class="n">new_table_name</span><span class="o">></span> + +<span class="k">For</span> <span class="n">example</span><span class="p">:</span> +<span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table1</span> <span class="k">RENAME</span> <span class="k">TO</span> <span class="n">table2</span><span class="p">;</span> +</pre></div> +</div> +<p>This statement lets you change the name of a table to a different name.</p> +</div> +<div class="section" id="rename-column"> +<h2>RENAME COLUMN<a class="headerlink" href="#rename-column" title="Permalink to this headline">¶</a></h2> +<p><em>Synopsis</em></p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="o"><</span><span class="k">table_name</span><span class="o">></span> <span class="k">RENAME</span> <span class="k">COLUMN</span> <span class="o"><</span><span class="k">column_name</span><span class="o">></span> <span class="k">TO</span> <span class="o"><</span><span class="n">new_column_name</span><span class="o">></span> + +<span class="k">For</span> <span class="n">example</span><span class="p">:</span> +<span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table1</span> <span class="k">RENAME</span> <span class="k">COLUMN</span> <span class="n">id</span> <span class="k">TO</span> <span class="n">id2</span><span class="p">;</span> +</pre></div> +</div> +<p>This statement will allow users to change a column’s name.</p> +</div> +<div class="section" id="add-column"> +<h2>ADD COLUMN<a class="headerlink" href="#add-column" title="Permalink to this headline">¶</a></h2> +<p><em>Synopsis</em></p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="o"><</span><span class="k">table_name</span><span class="o">></span> <span class="k">ADD</span> <span class="k">COLUMN</span> <span class="o"><</span><span class="k">column_name</span><span class="o">></span> <span class="o"><</span><span class="n">data_type</span><span class="o">></span> + +<span class="k">For</span> <span class="n">example</span><span class="p">:</span> +<span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table1</span> <span class="k">ADD</span> <span class="k">COLUMN</span> <span class="n">id</span> <span class="nb">text</span><span class="p">;</span> +</pre></div> +</div> +<p>This statement lets you add new columns to the end of the existing column.</p> +</div> +<div class="section" id="set-property"> +<h2>SET PROPERTY<a class="headerlink" href="#set-property" title="Permalink to this headline">¶</a></h2> +<p><em>Synopsis</em></p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="o"><</span><span class="k">table_name</span><span class="o">></span> <span class="k">SET</span> <span class="n">PROPERTY</span> <span class="p">(</span><span class="o"><</span><span class="k">key</span><span class="o">></span> <span class="o">=</span> <span class="o"><</span><span class="n">value</span><span class="o">></span><span class="p">,</span> <span class="p">...)</span> + +<span class="k">For</span> <span class="n">example</span><span class="p">:</span> +<span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table1</span> <span class="k">SET</span> <span class="n">PROPERTY</span> <span class="s1">'timezone'</span> <span class="o">=</span> <span class="s1">'GMT-7'</span> +<span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table1</span> <span class="k">SET</span> <span class="n">PROPERTY</span> <span class="s1">'text.delimiter'</span> <span class="o">=</span> <span class="s1">'&'</span> +<span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table1</span> <span class="k">SET</span> <span class="n">PROPERTY</span> <span class="s1">'compression.type'</span><span class="o">=</span><span class="s1">'RECORD'</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> +</pre></div> +</div> +<p>This statement will allow users to change a table property.</p> +</div> +<div class="section" id="drop-partition"> +<h2>DROP PARTITION<a class="headerlink" href="#drop-partition" title="Permalink to this headline">¶</a></h2> +<p><em>Synopsis</em></p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="o"><</span><span class="k">table_name</span><span class="o">></span> <span class="p">[</span><span class="n">IF</span> <span class="k">EXISTS</span><span class="p">]</span> <span class="k">DROP</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="o"><</span><span class="n">partition</span> <span class="k">column</span><span class="o">></span> <span class="o">=</span> <span class="o"><</span><span class="n">partition</span> <span class="n">value</span><span class="o">></span><span class="p">,</span> <span class="p">...)</span> <span class="p">[</span><span class="n">PURGE</span><span class="p">]</span> + +<span class="k">For</span> <span class="n">example</span><span class="p">:</span> +<span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table1</span> <span class="k">DROP</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">col1</span> <span class="o">=</span> <span class="mi">1</span> <span class="p">,</span> <span class="n">col2</span> <span class="o">=</span> <span class="mi">2</span><span class="p">)</span> +<span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table1</span> <span class="k">DROP</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">col1</span> <span class="o">=</span> <span class="s1">'2015'</span> <span class="p">,</span> <span class="n">col2</span> <span class="o">=</span> <span class="s1">'01'</span><span class="p">,</span> <span class="n">col3</span> <span class="o">=</span> <span class="s1">'11'</span> <span class="p">)</span> +<span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table1</span> <span class="k">DROP</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">col1</span> <span class="o">=</span> <span class="s1">'TAJO'</span> <span class="p">)</span> <span class="n">PURGE</span> +</pre></div> +</div> +<p>You can use <code class="docutils literal"><span class="pre">ALTER</span> <span class="pre">TABLE</span> <span class="pre">DROP</span> <span class="pre">PARTITION</span></code> to drop a partition for a table. This doesn’t remove the data for a table. But if <code class="docutils literal"><span class="pre">PURGE</span></code> is specified, the partition data will be removed. The metadata is completely lost in all cases. An error is thrown if the partition for the table doesn’t exist. You can use <code class="docutils literal"><span class="pre">IF</span> <span class="pre">EXISTS</span></code> to skip the error.</p> +</div> +<div class="section" id="repair-partition"> +<h2>REPAIR PARTITION<a class="headerlink" href="#repair-partition" title="Permalink to this headline">¶</a></h2> +<p>Tajo stores a list of partitions for each table in its catalog. If partitions are manually added to the distributed file system, the metastore is not aware of these partitions. Running the <code class="docutils literal"><span class="pre">ALTER</span> <span class="pre">TABLE</span> <span class="pre">REPAIR</span> <span class="pre">PARTITION</span></code> statement ensures that the tables are properly populated.</p> +<p><em>Synopsis</em></p> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="o"><</span><span class="k">table_name</span><span class="o">></span> <span class="n">REPAIR</span> <span class="n">PARTITION</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Even though an information of a partition is stored in the catalog, Tajo does not recover it when its partition directory doesn’t exist in the file system.</p> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="queries.html" class="btn btn-neutral float-right" title="Queries"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="insert.html" class="btn btn-neutral" title="INSERT (OVERWRITE) INTO"><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
