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Flink DDL
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Flink Queries
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Flink Writes
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Flink Actions
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Hive
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Hive
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Enabling Iceberg support in Hive
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Hive 4.0.0-beta-1
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Hive 4.0.0-alpha-2
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Hive 4.0.0-alpha-1
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Enabling support
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Hadoop configuration
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Table property configuration
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Global Hive catalog
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CREATE TABLE AS SELECT
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CREATE TABLE LIKE TABLE
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Schema evolution
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Partition evolution
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Hive type to Iceberg type
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Table of contents
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
<li class="md-nav__item">
<a href="#feature-support" class="md-nav__link">
<span class="md-ellipsis">
Feature support
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#enabling-iceberg-support-in-hive" class="md-nav__link">
<span class="md-ellipsis">
Enabling Iceberg support in Hive
</span>
</a>
<nav class="md-nav" aria-label="Enabling Iceberg support in Hive">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#hive-400-beta-1" class="md-nav__link">
<span class="md-ellipsis">
Hive 4.0.0-beta-1
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#hive-400-alpha-2" class="md-nav__link">
<span class="md-ellipsis">
Hive 4.0.0-alpha-2
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#hive-400-alpha-1" class="md-nav__link">
<span class="md-ellipsis">
Hive 4.0.0-alpha-1
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#hive-23x-hive-31x" class="md-nav__link">
<span class="md-ellipsis">
Hive 2.3.x, Hive 3.1.x
</span>
</a>
<nav class="md-nav" aria-label="Hive 2.3.x, Hive 3.1.x">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#loading-runtime-jar" class="md-nav__link">
<span class="md-ellipsis">
Loading runtime jar
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#enabling-support" class="md-nav__link">
<span class="md-ellipsis">
Enabling support
</span>
</a>
<nav class="md-nav" aria-label="Enabling support">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#hadoop-configuration" class="md-nav__link">
<span class="md-ellipsis">
Hadoop configuration
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#table-property-configuration" class="md-nav__link">
<span class="md-ellipsis">
Table property configuration
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#hive-on-tez-configuration" class="md-nav__link">
<span class="md-ellipsis">
Hive on Tez configuration
</span>
</a>
</li>
</ul>
</nav>
</li>
</ul>
</nav>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#catalog-management" class="md-nav__link">
<span class="md-ellipsis">
Catalog Management
</span>
</a>
<nav class="md-nav" aria-label="Catalog Management">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#global-hive-catalog" class="md-nav__link">
<span class="md-ellipsis">
Global Hive catalog
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#custom-iceberg-catalogs" class="md-nav__link">
<span class="md-ellipsis">
Custom Iceberg catalogs
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#ddl-commands" class="md-nav__link">
<span class="md-ellipsis">
DDL Commands
</span>
</a>
<nav class="md-nav" aria-label="DDL Commands">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#create-table" class="md-nav__link">
<span class="md-ellipsis">
CREATE TABLE
</span>
</a>
<nav class="md-nav" aria-label="CREATE TABLE">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#non-partitioned-tables" class="md-nav__link">
<span class="md-ellipsis">
Non partitioned tables
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#partitioned-tables" class="md-nav__link">
<span class="md-ellipsis">
Partitioned tables
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#create-table-as-select" class="md-nav__link">
<span class="md-ellipsis">
CREATE TABLE AS SELECT
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#create-table-like-table" class="md-nav__link">
<span class="md-ellipsis">
CREATE TABLE LIKE TABLE
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#create-external-table-overlaying-an-existing-iceberg-table" class="md-nav__link">
<span class="md-ellipsis">
CREATE EXTERNAL TABLE overlaying an existing Iceberg table
</span>
</a>
<nav class="md-nav" aria-label="CREATE EXTERNAL TABLE overlaying an existing Iceberg table">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#hive-catalog-tables" class="md-nav__link">
<span class="md-ellipsis">
Hive catalog tables
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#custom-catalog-tables" class="md-nav__link">
<span class="md-ellipsis">
Custom catalog tables
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#path-based-hadoop-tables" class="md-nav__link">
<span class="md-ellipsis">
Path-based Hadoop tables
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#create-table-overlaying-an-existing-iceberg-table" class="md-nav__link">
<span class="md-ellipsis">
CREATE TABLE overlaying an existing Iceberg table
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#alter-table" class="md-nav__link">
<span class="md-ellipsis">
ALTER TABLE
</span>
</a>
<nav class="md-nav" aria-label="ALTER TABLE">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#table-properties" class="md-nav__link">
<span class="md-ellipsis">
Table properties
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#schema-evolution" class="md-nav__link">
<span class="md-ellipsis">
Schema evolution
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#partition-evolution" class="md-nav__link">
<span class="md-ellipsis">
Partition evolution
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#table-migration" class="md-nav__link">
<span class="md-ellipsis">
Table migration
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#truncate-table" class="md-nav__link">
<span class="md-ellipsis">
TRUNCATE TABLE
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#drop-table" class="md-nav__link">
<span class="md-ellipsis">
DROP TABLE
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#metadata-location" class="md-nav__link">
<span class="md-ellipsis">
METADATA LOCATION
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="#dml-commands" class="md-nav__link">
<span class="md-ellipsis">
DML Commands
</span>
</a>
<nav class="md-nav" aria-label="DML Commands">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#select" class="md-nav__link">
<span class="md-ellipsis">
SELECT
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#insert-into" class="md-nav__link">
<span class="md-ellipsis">
INSERT INTO
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#insert-overwrite" class="md-nav__link">
<span class="md-ellipsis">
INSERT OVERWRITE
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#querying-metadata-tables" class="md-nav__link">
<span class="md-ellipsis">
QUERYING METADATA TABLES
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#timetravel" class="md-nav__link">
<span class="md-ellipsis">
TIMETRAVEL
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#type-compatibility" class="md-nav__link">
<span class="md-ellipsis">
Type compatibility
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#hive-type-to-iceberg-type" class="md-nav__link">
<span class="md-ellipsis">
Hive type to Iceberg type
</span>
</a>
</li>
<li class="md-nav__item">
<a href="#table-rollback" class="md-nav__link">
<span class="md-ellipsis">
Table rollback
</span>
</a>
</li>
</ul>
</nav>
</li>
</ul>
</nav>
</div>
</div>
</div>
<div class="md-content" data-md-component="content">
<article class="md-content__inner md-typeset">
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<h1 id="hive">Hive<a class="headerlink" href="#hive" title="Permanent link">🔗</a></h1>
<p>Iceberg supports reading and writing Iceberg tables through <a href="https://hive.apache.org">Hive</a> by using
a <a href="https://cwiki.apache.org/confluence/display/Hive/StorageHandlers">StorageHandler</a>.</p>
<h2 id="feature-support">Feature support<a class="headerlink" href="#feature-support" title="Permanent link">🔗</a></h2>
<p>Iceberg compatibility with Hive 2.x and Hive 3.1.2/3 supports the following features:</p>
<ul>
<li>Creating a table</li>
<li>Dropping a table</li>
<li>Reading a table</li>
<li>Inserting into a table (INSERT INTO)</li>
</ul>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>DML operations work only with MapReduce execution engine.</p>
</div>
<p>With Hive version 4.0.0-alpha-2 and above,
the Iceberg integration when using HiveCatalog supports the following additional features:</p>
<ul>
<li>Altering a table with expiring snapshots.</li>
<li>Create a table like an existing table (CTLT table)</li>
<li>Support adding parquet compression type via Table properties <a href="https://spark.apache.org/docs/2.4.3/sql-data-sources-parquet.html#configuration">Compression types</a></li>
<li>Altering a table metadata location</li>
<li>Supporting table rollback</li>
<li>Honors sort orders on existing tables when writing a table <a href="../../../spec/#sort-orders">Sort orders specification</a></li>
</ul>
<p>With Hive version 4.0.0-alpha-1 and above, the Iceberg integration when using HiveCatalog supports the following additional features:</p>
<ul>
<li>Creating an Iceberg identity-partitioned table</li>
<li>Creating an Iceberg table with any partition spec, including the various transforms supported by Iceberg</li>
<li>Creating a table from an existing table (CTAS table)</li>
<li>Altering a table while keeping Iceberg and Hive schemas in sync</li>
<li>Altering the partition schema (updating columns)</li>
<li>Altering the partition schema by specifying partition transforms</li>
<li>Truncating a table</li>
<li>Migrating tables in Avro, Parquet, or ORC (Non-ACID) format to Iceberg</li>
<li>Reading the schema of a table</li>
<li>Querying Iceberg metadata tables</li>
<li>Time travel applications</li>
<li>Inserting into a table (INSERT INTO)</li>
<li>Inserting data overwriting existing data (INSERT OVERWRITE)</li>
</ul>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>DML operations work only with Tez execution engine.</p>
</div>
<h2 id="enabling-iceberg-support-in-hive">Enabling Iceberg support in Hive<a class="headerlink" href="#enabling-iceberg-support-in-hive" title="Permanent link">🔗</a></h2>
<p>Hive 4 comes with <code>hive-iceberg</code> that ships Iceberg, so no additional downloads or jars are needed. For older versions of Hive a runtime jar has to be added.</p>
<h3 id="hive-400-beta-1">Hive 4.0.0-beta-1<a class="headerlink" href="#hive-400-beta-1" title="Permanent link">🔗</a></h3>
<p>Hive 4.0.0-beta-1 comes with the Iceberg 1.3.0 included.</p>
<h3 id="hive-400-alpha-2">Hive 4.0.0-alpha-2<a class="headerlink" href="#hive-400-alpha-2" title="Permanent link">🔗</a></h3>
<p>Hive 4.0.0-alpha-2 comes with the Iceberg 0.14.1 included.</p>
<h3 id="hive-400-alpha-1">Hive 4.0.0-alpha-1<a class="headerlink" href="#hive-400-alpha-1" title="Permanent link">🔗</a></h3>
<p>Hive 4.0.0-alpha-1 comes with the Iceberg 0.13.1 included.</p>
<h3 id="hive-23x-hive-31x">Hive 2.3.x, Hive 3.1.x<a class="headerlink" href="#hive-23x-hive-31x" title="Permanent link">🔗</a></h3>
<p>In order to use Hive 2.3.x or Hive 3.1.x, you must load the Iceberg-Hive runtime jar and enable Iceberg support, either globally or for an individual table using a table property.</p>
<h4 id="loading-runtime-jar">Loading runtime jar<a class="headerlink" href="#loading-runtime-jar" title="Permanent link">🔗</a></h4>
<p>To enable Iceberg support in Hive, the <code>HiveIcebergStorageHandler</code> and supporting classes need to be made available on
Hive's classpath. These are provided by the <code>iceberg-hive-runtime</code> jar file. For example, if using the Hive shell, this
can be achieved by issuing a statement like so:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>add jar /path/to/iceberg-hive-runtime.jar;
</code></pre></div>
<p>There are many others ways to achieve this including adding the jar file to Hive's auxiliary classpath so it is
available by default. Please refer to Hive's documentation for more information.</p>
<h4 id="enabling-support">Enabling support<a class="headerlink" href="#enabling-support" title="Permanent link">🔗</a></h4>
<p>If the Iceberg storage handler is not in Hive's classpath, then Hive cannot load or update the metadata for an Iceberg
table when the storage handler is set. To avoid the appearance of broken tables in Hive, Iceberg will not add the
storage handler to a table unless Hive support is enabled. The storage handler is kept in sync (added or removed) every
time Hive engine support for the table is updated, i.e. turned on or off in the table properties. There are two ways to
enable Hive support: globally in Hadoop Configuration and per-table using a table property.</p>
<h5 id="hadoop-configuration">Hadoop configuration<a class="headerlink" href="#hadoop-configuration" title="Permanent link">🔗</a></h5>
<p>To enable Hive support globally for an application, set <code>iceberg.engine.hive.enabled=true</code> in its Hadoop configuration.
For example, setting this in the <code>hive-site.xml</code> loaded by Spark will enable the storage handler for all tables created
by Spark.</p>
<div class="admonition danger">
<p class="admonition-title">Danger</p>
<p>Starting with Apache Iceberg <code>0.11.0</code>, when using Hive with Tez you also have to disable vectorization (<code>hive.vectorized.execution.enabled=false</code>).</p>
</div>
<h5 id="table-property-configuration">Table property configuration<a class="headerlink" href="#table-property-configuration" title="Permanent link">🔗</a></h5>
<p>Alternatively, the property <code>engine.hive.enabled</code> can be set to <code>true</code> and added to the table properties when creating
the Iceberg table. Here is an example of doing it programmatically:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="n">Catalog</span><span class="w"> </span><span class="n">catalog</span><span class="o">=</span><span class="p">...;</span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">tableProperties</span><span class="o">=</span><span class="n">Maps</span><span class="p">.</span><span class="na">newHashMap</span><span class="p">();</span>
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="w"> </span><span class="n">tableProperties</span><span class="p">.</span><span class="na">put</span><span class="p">(</span><span class="n">TableProperties</span><span class="p">.</span><span class="na">ENGINE_HIVE_ENABLED</span><span class="p">,</span><span class="s">&quot;true&quot;</span><span class="p">);</span><span class="w"> </span><span class="c1">// engine.hive.enabled=true</span>
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span><span class="n">catalog</span><span class="p">.</span><span class="na">createTable</span><span class="p">(</span><span class="n">tableId</span><span class="p">,</span><span class="n">schema</span><span class="p">,</span><span class="n">spec</span><span class="p">,</span><span class="n">tableProperties</span><span class="p">);</span>
</code></pre></div>
<p>The table level configuration overrides the global Hadoop configuration.</p>
<h5 id="hive-on-tez-configuration">Hive on Tez configuration<a class="headerlink" href="#hive-on-tez-configuration" title="Permanent link">🔗</a></h5>
<p>To use the Tez engine on Hive <code>3.1.2</code> or later, Tez needs to be upgraded to &gt;= <code>0.10.1</code> which contains a necessary fix <a href="https://issues.apache.org/jira/browse/TEZ-4248">TEZ-4248</a>.</p>
<p>To use the Tez engine on Hive <code>2.3.x</code>, you will need to manually build Tez from the <code>branch-0.9</code> branch due to a
backwards incompatibility issue with Tez <code>0.10.1</code>.</p>
<p>In both cases, you will also need to set the following property in the <code>tez-site.xml</code> configuration file: <code>tez.mrreader.config.update.properties=hive.io.file.readcolumn.names,hive.io.file.readcolumn.ids</code>.</p>
<h2 id="catalog-management">Catalog Management<a class="headerlink" href="#catalog-management" title="Permanent link">🔗</a></h2>
<h3 id="global-hive-catalog">Global Hive catalog<a class="headerlink" href="#global-hive-catalog" title="Permanent link">🔗</a></h3>
<p>From the Hive engine's perspective, there is only one global data catalog that is defined in the Hadoop configuration in
the runtime environment. In contrast, Iceberg supports multiple different data catalog types such as Hive, Hadoop, AWS
Glue, or custom catalog implementations. Iceberg also allows loading a table directly based on its path in the file
system. Those tables do not belong to any catalog. Users might want to read these cross-catalog and path-based tables
through the Hive engine for use cases like join.</p>
<p>To support this, a table in the Hive metastore can represent three different ways of loading an Iceberg table, depending
on the table's <code>iceberg.catalog</code> property:</p>
<ol>
<li>The table will be loaded using a <code>HiveCatalog</code> that corresponds to the metastore configured in the Hive environment
if no <code>iceberg.catalog</code> is set</li>
<li>The table will be loaded using a custom catalog if <code>iceberg.catalog</code> is set to a catalog name (see below)</li>
<li>The table can be loaded directly using the table's root location if <code>iceberg.catalog</code> is set
to <code>location_based_table</code></li>
</ol>
<p>For cases 2 and 3 above, users can create an overlay of an Iceberg table in the Hive metastore, so that different table
types can work together in the same Hive environment. See <a href="#create-external-table-overlaying-an-existing-iceberg-table">CREATE EXTERNAL TABLE</a>
and <a href="#create-table">CREATE TABLE</a> for more details.</p>
<h3 id="custom-iceberg-catalogs">Custom Iceberg catalogs<a class="headerlink" href="#custom-iceberg-catalogs" title="Permanent link">🔗</a></h3>
<p>To globally register different catalogs, set the following Hadoop configurations:</p>
<table>
<thead>
<tr>
<th>Config Key</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>iceberg.catalog.&lt;catalog_name&gt;.type</td>
<td>type of catalog: <code>hive</code>, <code>hadoop</code>, or left unset if using a custom catalog</td>
</tr>
<tr>
<td>iceberg.catalog.&lt;catalog_name&gt;.catalog-impl</td>
<td>catalog implementation, must not be null if type is empty</td>
</tr>
<tr>
<td>iceberg.catalog.&lt;catalog_name&gt;.&lt;key&gt;</td>
<td>any config key and value pairs for the catalog</td>
</tr>
</tbody>
</table>
<p>Here are some examples using Hive CLI:</p>
<p>Register a <code>HiveCatalog</code> called <code>another_hive</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>SET iceberg.catalog.another_hive.type=hive;
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>SET iceberg.catalog.another_hive.uri=thrift://example.com:9083;
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>SET iceberg.catalog.another_hive.clients=10;
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a>SET iceberg.catalog.another_hive.warehouse=hdfs://example.com:8020/warehouse;
</code></pre></div>
<p>Register a <code>HadoopCatalog</code> called <code>hadoop</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>SET iceberg.catalog.hadoop.type=hadoop;
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>SET iceberg.catalog.hadoop.warehouse=hdfs://example.com:8020/warehouse;
</code></pre></div>
<p>Register an AWS <code>GlueCatalog</code> called <code>glue</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a>SET iceberg.catalog.glue.catalog-impl=org.apache.iceberg.aws.glue.GlueCatalog;
<a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a>SET iceberg.catalog.glue.warehouse=s3://my-bucket/my/key/prefix;
<a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a>SET iceberg.catalog.glue.lock.table=myGlueLockTable;
</code></pre></div>
<h2 id="ddl-commands">DDL Commands<a class="headerlink" href="#ddl-commands" title="Permanent link">🔗</a></h2>
<p>Not all the features below are supported with Hive 2.3.x and Hive 3.1.x. Please refer to the
<a href="#feature-support">Feature support</a> paragraph for further details.</p>
<p>One generally applicable difference is that Hive 4.0.0-alpha-1 provides the possibility to use
<code>STORED BY ICEBERG</code> instead of the old <code>STORED BY 'org.apache.iceberg.mr.hive.HiveIcebergStorageHandler'</code></p>
<h3 id="create-table">CREATE TABLE<a class="headerlink" href="#create-table" title="Permanent link">🔗</a></h3>
<h4 id="non-partitioned-tables">Non partitioned tables<a class="headerlink" href="#non-partitioned-tables" title="Permanent link">🔗</a></h4>
<p>The Hive <code>CREATE EXTERNAL TABLE</code> command creates an Iceberg table when you specify the storage handler as follows:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="k">CREATE</span><span class="w"> </span><span class="k">EXTERNAL</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="p">(</span><span class="n">i</span><span class="w"> </span><span class="nb">int</span><span class="p">)</span><span class="w"> </span><span class="n">STORED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">ICEBERG</span><span class="p">;</span>
</code></pre></div>
<p>If you want to create external tables using CREATE TABLE, configure the MetaStoreMetadataTransformer on the cluster,
and <code>CREATE TABLE</code> commands are transformed to create external tables. For example:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="p">(</span><span class="n">i</span><span class="w"> </span><span class="nb">int</span><span class="p">)</span><span class="w"> </span><span class="n">STORED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">ICEBERG</span><span class="p">;</span>
</code></pre></div>
<p>You can specify the default file format (Avro, Parquet, ORC) at the time of the table creation.
The default is Parquet:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="p">(</span><span class="n">i</span><span class="w"> </span><span class="nb">int</span><span class="p">)</span><span class="w"> </span><span class="n">STORED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">ICEBERG</span><span class="w"> </span><span class="n">STORED</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="n">ORC</span><span class="p">;</span>
</code></pre></div>
<h4 id="partitioned-tables">Partitioned tables<a class="headerlink" href="#partitioned-tables" title="Permanent link">🔗</a></h4>
<p>You can create Iceberg partitioned tables using a command familiar to those who create non-Iceberg tables:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="p">(</span><span class="n">i</span><span class="w"> </span><span class="nb">int</span><span class="p">)</span><span class="w"> </span><span class="n">PARTITIONED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="p">(</span><span class="n">j</span><span class="w"> </span><span class="nb">int</span><span class="p">)</span><span class="w"> </span><span class="n">STORED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">ICEBERG</span><span class="p">;</span>
</code></pre></div>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>The resulting table does not create partitions in HMS, but instead, converts partition data into Iceberg identity partitions.</p>
</div>
<p>Use the DESCRIBE command to get information about the Iceberg identity partitions:</p>
<p><div class="highlight"><pre><span></span><code><a id="__codelineno-9-1" name="__codelineno-9-1" href="#__codelineno-9-1"></a><span class="k">DESCRIBE</span><span class="w"> </span><span class="n">x</span><span class="p">;</span>
</code></pre></div>
The result is:</p>
<table>
<thead>
<tr>
<th>col_name</th>
<th>data_type</th>
<th>comment</th>
</tr>
</thead>
<tbody>
<tr>
<td>i</td>
<td>int</td>
<td></td>
</tr>
<tr>
<td>j</td>
<td>int</td>
<td></td>
</tr>
<tr>
<td></td>
<td>NULL</td>
<td>NULL</td>
</tr>
<tr>
<td># Partition Transform Information</td>
<td>NULL</td>
<td>NULL</td>
</tr>
<tr>
<td># col_name</td>
<td>transform_type</td>
<td>NULL</td>
</tr>
<tr>
<td>j</td>
<td>IDENTITY</td>
<td>NULL</td>
</tr>
</tbody>
</table>
<p>You can create Iceberg partitions using the following Iceberg partition specification syntax
(supported only from Hive 4.0.0-alpha-1):</p>
<p><div class="highlight"><pre><span></span><code><a id="__codelineno-10-1" name="__codelineno-10-1" href="#__codelineno-10-1"></a><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="p">(</span><span class="n">i</span><span class="w"> </span><span class="nb">int</span><span class="p">,</span><span class="w"> </span><span class="n">ts</span><span class="w"> </span><span class="k">timestamp</span><span class="p">)</span><span class="w"> </span><span class="n">PARTITIONED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">SPEC</span><span class="w"> </span><span class="p">(</span><span class="k">month</span><span class="p">(</span><span class="n">ts</span><span class="p">),</span><span class="w"> </span><span class="n">bucket</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="n">i</span><span class="p">))</span><span class="w"> </span><span class="n">STORED</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="n">ICEBERG</span><span class="p">;</span>
<a id="__codelineno-10-2" name="__codelineno-10-2" href="#__codelineno-10-2"></a><span class="k">DESCRIBE</span><span class="w"> </span><span class="n">x</span><span class="p">;</span>
</code></pre></div>
The result is:</p>
<table>
<thead>
<tr>
<th>col_name</th>
<th>data_type</th>
<th>comment</th>
</tr>
</thead>
<tbody>
<tr>
<td>i</td>
<td>int</td>
<td></td>
</tr>
<tr>
<td>ts</td>
<td>timestamp</td>
<td></td>
</tr>
<tr>
<td></td>
<td>NULL</td>
<td>NULL</td>
</tr>
<tr>
<td># Partition Transform Information</td>
<td>NULL</td>
<td>NULL</td>
</tr>
<tr>
<td># col_name</td>
<td>transform_type</td>
<td>NULL</td>
</tr>
<tr>
<td>ts</td>
<td>MONTH</td>
<td>NULL</td>
</tr>
<tr>
<td>i</td>
<td>BUCKET[2]</td>
<td>NULL</td>
</tr>
</tbody>
</table>
<p>The supported transformations for Hive are the same as for Spark:
* years(ts): partition by year
* months(ts): partition by month
* days(ts) or date(ts): equivalent to dateint partitioning
* hours(ts) or date_hour(ts): equivalent to dateint and hour partitioning
* bucket(N, col): partition by hashed value mod N buckets
* truncate(L, col): partition by value truncated to L
- Strings are truncated to the given length
- Integers and longs truncate to bins: truncate(10, i) produces partitions 0, 10, 20, 30,</p>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>The resulting table does not create partitions in HMS, but instead, converts partition data into Iceberg partitions.</p>
</div>
<h3 id="create-table-as-select">CREATE TABLE AS SELECT<a class="headerlink" href="#create-table-as-select" title="Permanent link">🔗</a></h3>
<p><code>CREATE TABLE AS SELECT</code> operation resembles the native Hive operation with a single important difference.
The Iceberg table and the corresponding Hive table are created at the beginning of the query execution.
The data is inserted / committed when the query finishes. So for a transient period the table already exists but contains no data.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-11-1" name="__codelineno-11-1" href="#__codelineno-11-1"></a><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">target</span><span class="w"> </span><span class="n">PARTITIONED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">SPEC</span><span class="w"> </span><span class="p">(</span><span class="k">year</span><span class="p">(</span><span class="n">year_field</span><span class="p">),</span><span class="w"> </span><span class="n">identity_field</span><span class="p">)</span><span class="w"> </span><span class="n">STORED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">ICEBERG</span><span class="w"> </span><span class="k">AS</span>
<a id="__codelineno-11-2" name="__codelineno-11-2" href="#__codelineno-11-2"></a><span class="w"> </span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="k">source</span><span class="p">;</span>
</code></pre></div>
<h3 id="create-table-like-table">CREATE TABLE LIKE TABLE<a class="headerlink" href="#create-table-like-table" title="Permanent link">🔗</a></h3>
<div class="highlight"><pre><span></span><code><a id="__codelineno-12-1" name="__codelineno-12-1" href="#__codelineno-12-1"></a><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">target</span><span class="w"> </span><span class="k">LIKE</span><span class="w"> </span><span class="k">source</span><span class="w"> </span><span class="n">STORED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">ICEBERG</span><span class="p">;</span>
</code></pre></div>
<h3 id="create-external-table-overlaying-an-existing-iceberg-table">CREATE EXTERNAL TABLE overlaying an existing Iceberg table<a class="headerlink" href="#create-external-table-overlaying-an-existing-iceberg-table" title="Permanent link">🔗</a></h3>
<p>The <code>CREATE EXTERNAL TABLE</code> command is used to overlay a Hive table "on top of" an existing Iceberg table. Iceberg
tables are created using either a <a href="../../../javadoc/1.5.2/?org/apache/iceberg/catalog/Catalog.html"><code>Catalog</code></a>, or an implementation of the <a href="../../../javadoc/1.5.2/?org/apache/iceberg/Tables.html"><code>Tables</code></a> interface, and Hive needs to be configured accordingly to operate on these different types of table.</p>
<h4 id="hive-catalog-tables">Hive catalog tables<a class="headerlink" href="#hive-catalog-tables" title="Permanent link">🔗</a></h4>
<p>As described before, tables created by the <code>HiveCatalog</code> with Hive engine feature enabled are directly visible by the
Hive engine, so there is no need to create an overlay.</p>
<h4 id="custom-catalog-tables">Custom catalog tables<a class="headerlink" href="#custom-catalog-tables" title="Permanent link">🔗</a></h4>
<p>For a table in a registered catalog, specify the catalog name in the statement using table property <code>iceberg.catalog</code>.
For example, the SQL below creates an overlay for a table in a <code>hadoop</code> type catalog named <code>hadoop_cat</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-13-1" name="__codelineno-13-1" href="#__codelineno-13-1"></a><span class="k">SET</span>
<a id="__codelineno-13-2" name="__codelineno-13-2" href="#__codelineno-13-2"></a><span class="n">iceberg</span><span class="p">.</span><span class="k">catalog</span><span class="p">.</span><span class="n">hadoop_cat</span><span class="p">.</span><span class="k">type</span><span class="o">=</span><span class="n">hadoop</span><span class="p">;</span>
<a id="__codelineno-13-3" name="__codelineno-13-3" href="#__codelineno-13-3"></a><span class="k">SET</span>
<a id="__codelineno-13-4" name="__codelineno-13-4" href="#__codelineno-13-4"></a><span class="n">iceberg</span><span class="p">.</span><span class="k">catalog</span><span class="p">.</span><span class="n">hadoop_cat</span><span class="p">.</span><span class="n">warehouse</span><span class="o">=</span><span class="n">hdfs</span><span class="p">:</span><span class="o">//</span><span class="n">example</span><span class="p">.</span><span class="n">com</span><span class="p">:</span><span class="mi">8020</span><span class="o">/</span><span class="n">hadoop_cat</span><span class="p">;</span>
<a id="__codelineno-13-5" name="__codelineno-13-5" href="#__codelineno-13-5"></a>
<a id="__codelineno-13-6" name="__codelineno-13-6" href="#__codelineno-13-6"></a><span class="k">CREATE</span>
<a id="__codelineno-13-7" name="__codelineno-13-7" href="#__codelineno-13-7"></a><span class="k">EXTERNAL</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">database_a</span><span class="p">.</span><span class="n">table_a</span>
<a id="__codelineno-13-8" name="__codelineno-13-8" href="#__codelineno-13-8"></a><span class="n">STORED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="s1">&#39;org.apache.iceberg.mr.hive.HiveIcebergStorageHandler&#39;</span>
<a id="__codelineno-13-9" name="__codelineno-13-9" href="#__codelineno-13-9"></a><span class="n">TBLPROPERTIES</span><span class="w"> </span><span class="p">(</span><span class="s1">&#39;iceberg.catalog&#39;</span><span class="o">=</span><span class="s1">&#39;hadoop_cat&#39;</span><span class="p">);</span>
</code></pre></div>
<p>When <code>iceberg.catalog</code> is missing from both table properties and the global Hadoop configuration, <code>HiveCatalog</code> will be
used as default.</p>
<h4 id="path-based-hadoop-tables">Path-based Hadoop tables<a class="headerlink" href="#path-based-hadoop-tables" title="Permanent link">🔗</a></h4>
<p>Iceberg tables created using <code>HadoopTables</code> are stored entirely in a directory in a filesystem like HDFS. These tables
are considered to have no catalog. To indicate that, set <code>iceberg.catalog</code> property to <code>location_based_table</code>. For
example:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-14-1" name="__codelineno-14-1" href="#__codelineno-14-1"></a><span class="k">CREATE</span>
<a id="__codelineno-14-2" name="__codelineno-14-2" href="#__codelineno-14-2"></a><span class="k">EXTERNAL</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">table_a</span><span class="w"> </span>
<a id="__codelineno-14-3" name="__codelineno-14-3" href="#__codelineno-14-3"></a><span class="n">STORED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="s1">&#39;org.apache.iceberg.mr.hive.HiveIcebergStorageHandler&#39;</span><span class="w"> </span>
<a id="__codelineno-14-4" name="__codelineno-14-4" href="#__codelineno-14-4"></a><span class="k">LOCATION</span><span class="w"> </span><span class="s1">&#39;hdfs://some_bucket/some_path/table_a&#39;</span>
<a id="__codelineno-14-5" name="__codelineno-14-5" href="#__codelineno-14-5"></a><span class="n">TBLPROPERTIES</span><span class="w"> </span><span class="p">(</span><span class="s1">&#39;iceberg.catalog&#39;</span><span class="o">=</span><span class="s1">&#39;location_based_table&#39;</span><span class="p">);</span>
</code></pre></div>
<h4 id="create-table-overlaying-an-existing-iceberg-table">CREATE TABLE overlaying an existing Iceberg table<a class="headerlink" href="#create-table-overlaying-an-existing-iceberg-table" title="Permanent link">🔗</a></h4>
<p>You can also create a new table that is managed by a custom catalog. For example, the following code creates a table in
a custom Hadoop catalog:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-15-1" name="__codelineno-15-1" href="#__codelineno-15-1"></a><span class="k">SET</span>
<a id="__codelineno-15-2" name="__codelineno-15-2" href="#__codelineno-15-2"></a><span class="n">iceberg</span><span class="p">.</span><span class="k">catalog</span><span class="p">.</span><span class="n">hadoop_cat</span><span class="p">.</span><span class="k">type</span><span class="o">=</span><span class="n">hadoop</span><span class="p">;</span>
<a id="__codelineno-15-3" name="__codelineno-15-3" href="#__codelineno-15-3"></a><span class="k">SET</span>
<a id="__codelineno-15-4" name="__codelineno-15-4" href="#__codelineno-15-4"></a><span class="n">iceberg</span><span class="p">.</span><span class="k">catalog</span><span class="p">.</span><span class="n">hadoop_cat</span><span class="p">.</span><span class="n">warehouse</span><span class="o">=</span><span class="n">hdfs</span><span class="p">:</span><span class="o">//</span><span class="n">example</span><span class="p">.</span><span class="n">com</span><span class="p">:</span><span class="mi">8020</span><span class="o">/</span><span class="n">hadoop_cat</span><span class="p">;</span>
<a id="__codelineno-15-5" name="__codelineno-15-5" href="#__codelineno-15-5"></a>
<a id="__codelineno-15-6" name="__codelineno-15-6" href="#__codelineno-15-6"></a><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">database_a</span><span class="p">.</span><span class="n">table_a</span>
<a id="__codelineno-15-7" name="__codelineno-15-7" href="#__codelineno-15-7"></a><span class="p">(</span>
<a id="__codelineno-15-8" name="__codelineno-15-8" href="#__codelineno-15-8"></a><span class="w"> </span><span class="n">id</span><span class="w"> </span><span class="nb">bigint</span><span class="p">,</span>
<a id="__codelineno-15-9" name="__codelineno-15-9" href="#__codelineno-15-9"></a><span class="w"> </span><span class="n">name</span><span class="w"> </span><span class="n">string</span>
<a id="__codelineno-15-10" name="__codelineno-15-10" href="#__codelineno-15-10"></a><span class="p">)</span><span class="w"> </span><span class="n">PARTITIONED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="p">(</span>
<a id="__codelineno-15-11" name="__codelineno-15-11" href="#__codelineno-15-11"></a><span class="w"> </span><span class="n">dept</span><span class="w"> </span><span class="n">string</span>
<a id="__codelineno-15-12" name="__codelineno-15-12" href="#__codelineno-15-12"></a><span class="p">)</span><span class="w"> </span><span class="n">STORED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="s1">&#39;org.apache.iceberg.mr.hive.HiveIcebergStorageHandler&#39;</span>
<a id="__codelineno-15-13" name="__codelineno-15-13" href="#__codelineno-15-13"></a><span class="n">TBLPROPERTIES</span><span class="w"> </span><span class="p">(</span><span class="s1">&#39;iceberg.catalog&#39;</span><span class="o">=</span><span class="s1">&#39;hadoop_cat&#39;</span><span class="p">);</span>
</code></pre></div>
<div class="admonition danger">
<p class="admonition-title">Danger</p>
<p>If the table to create already exists in the custom catalog, this will create a managed overlay
table. This means technically you can omit the <code>EXTERNAL</code> keyword when creating an overlay table. However, this is <strong>not
recommended</strong> because creating managed overlay tables could pose a risk to the shared data files in case of accidental
drop table commands from the Hive side, which would unintentionally remove all the data in the table.</p>
</div>
<h3 id="alter-table">ALTER TABLE<a class="headerlink" href="#alter-table" title="Permanent link">🔗</a></h3>
<h4 id="table-properties">Table properties<a class="headerlink" href="#table-properties" title="Permanent link">🔗</a></h4>
<p>For HiveCatalog tables the Iceberg table properties and the Hive table properties stored in HMS are kept in sync.</p>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>IMPORTANT: This feature is not available for other Catalog implementations.</p>
</div>
<div class="highlight"><pre><span></span><code><a id="__codelineno-16-1" name="__codelineno-16-1" href="#__codelineno-16-1"></a><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="k">SET</span><span class="w"> </span><span class="n">TBLPROPERTIES</span><span class="p">(</span><span class="s1">&#39;...&#39;</span><span class="o">=</span><span class="s1">&#39;...&#39;</span><span class="p">);</span>
</code></pre></div>
<h4 id="schema-evolution">Schema evolution<a class="headerlink" href="#schema-evolution" title="Permanent link">🔗</a></h4>
<p>The Hive table schema is kept in sync with the Iceberg table. If an outside source (Impala/Spark/Java API/etc)
changes the schema, the Hive table immediately reflects the changes. You alter the table schema using Hive commands:</p>
<ul>
<li>Add a column
<div class="highlight"><pre><span></span><code><a id="__codelineno-17-1" name="__codelineno-17-1" href="#__codelineno-17-1"></a><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">orders</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="n">COLUMNS</span><span class="w"> </span><span class="p">(</span><span class="n">nickname</span><span class="w"> </span><span class="n">string</span><span class="p">);</span>
</code></pre></div></li>
<li>Rename a column
<div class="highlight"><pre><span></span><code><a id="__codelineno-18-1" name="__codelineno-18-1" href="#__codelineno-18-1"></a><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">orders</span><span class="w"> </span><span class="n">CHANGE</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="n">item</span><span class="w"> </span><span class="n">fruit</span><span class="w"> </span><span class="n">string</span><span class="p">;</span>
</code></pre></div></li>
<li>Reorder columns
<div class="highlight"><pre><span></span><code><a id="__codelineno-19-1" name="__codelineno-19-1" href="#__codelineno-19-1"></a><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">orders</span><span class="w"> </span><span class="n">CHANGE</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="n">quantity</span><span class="w"> </span><span class="n">quantity</span><span class="w"> </span><span class="nb">int</span><span class="w"> </span><span class="k">AFTER</span><span class="w"> </span><span class="n">price</span><span class="p">;</span>
</code></pre></div></li>
<li>Change a column type - only if the Iceberg defined the column type change as safe
<div class="highlight"><pre><span></span><code><a id="__codelineno-20-1" name="__codelineno-20-1" href="#__codelineno-20-1"></a><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">orders</span><span class="w"> </span><span class="n">CHANGE</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="n">price</span><span class="w"> </span><span class="n">price</span><span class="w"> </span><span class="n">long</span><span class="p">;</span>
</code></pre></div></li>
<li>Drop column by using REPLACE COLUMN to remove the old column
<div class="highlight"><pre><span></span><code><a id="__codelineno-21-1" name="__codelineno-21-1" href="#__codelineno-21-1"></a><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">orders</span><span class="w"> </span><span class="k">REPLACE</span><span class="w"> </span><span class="n">COLUMNS</span><span class="w"> </span><span class="p">(</span><span class="n">remaining</span><span class="w"> </span><span class="n">string</span><span class="p">);</span>
</code></pre></div></li>
</ul>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>Note, that dropping columns is only thing REPLACE COLUMNS can be used for
i.e. if columns are specified out-of-order an error will be thrown signalling this limitation.</p>
</div>
<h4 id="partition-evolution">Partition evolution<a class="headerlink" href="#partition-evolution" title="Permanent link">🔗</a></h4>
<p>You change the partitioning schema using the following commands:
* Change the partitioning schema to new identity partitions:
<div class="highlight"><pre><span></span><code><a id="__codelineno-22-1" name="__codelineno-22-1" href="#__codelineno-22-1"></a><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="k">default</span><span class="p">.</span><span class="n">customers</span><span class="w"> </span><span class="k">SET</span><span class="w"> </span><span class="n">PARTITION</span><span class="w"> </span><span class="n">SPEC</span><span class="w"> </span><span class="p">(</span><span class="n">last_name</span><span class="p">);</span>
</code></pre></div>
* Alternatively, provide a partition specification:
<div class="highlight"><pre><span></span><code><a id="__codelineno-23-1" name="__codelineno-23-1" href="#__codelineno-23-1"></a><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="k">order</span><span class="w"> </span><span class="k">SET</span><span class="w"> </span><span class="n">PARTITION</span><span class="w"> </span><span class="n">SPEC</span><span class="w"> </span><span class="p">(</span><span class="k">month</span><span class="p">(</span><span class="n">ts</span><span class="p">));</span>
</code></pre></div></p>
<h4 id="table-migration">Table migration<a class="headerlink" href="#table-migration" title="Permanent link">🔗</a></h4>
<p>You can migrate Avro / Parquet / ORC external tables to Iceberg tables using the following command:
<div class="highlight"><pre><span></span><code><a id="__codelineno-24-1" name="__codelineno-24-1" href="#__codelineno-24-1"></a><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="k">SET</span><span class="w"> </span><span class="n">TBLPROPERTIES</span><span class="w"> </span><span class="p">(</span><span class="s1">&#39;storage_handler&#39;</span><span class="o">=</span><span class="s1">&#39;org.apache.iceberg.mr.hive.HiveIcebergStorageHandler&#39;</span><span class="p">);</span>
</code></pre></div>
During the migration the data files are not changed, only the appropriate Iceberg metadata files are created.
After the migration, handle the table as a normal Iceberg table.</p>
<h3 id="truncate-table">TRUNCATE TABLE<a class="headerlink" href="#truncate-table" title="Permanent link">🔗</a></h3>
<p>The following command truncates the Iceberg table:
<div class="highlight"><pre><span></span><code><a id="__codelineno-25-1" name="__codelineno-25-1" href="#__codelineno-25-1"></a><span class="k">TRUNCATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">t</span><span class="p">;</span>
</code></pre></div>
Using a partition specification is not allowed.</p>
<h3 id="drop-table">DROP TABLE<a class="headerlink" href="#drop-table" title="Permanent link">🔗</a></h3>
<p>Tables can be dropped using the <code>DROP TABLE</code> command:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-26-1" name="__codelineno-26-1" href="#__codelineno-26-1"></a><span class="k">DROP</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="p">[</span><span class="k">IF</span><span class="w"> </span><span class="k">EXISTS</span><span class="p">]</span><span class="w"> </span><span class="k">table_name</span><span class="w"> </span><span class="p">[</span><span class="n">PURGE</span><span class="p">];</span>
</code></pre></div>
<h3 id="metadata-location">METADATA LOCATION<a class="headerlink" href="#metadata-location" title="Permanent link">🔗</a></h3>
<p>The metadata location (snapshot location) only can be changed if the new path contains the exact same metadata json.
It can be done only after migrating the table to Iceberg, the two operation cannot be done in one step. </p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-27-1" name="__codelineno-27-1" href="#__codelineno-27-1"></a><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="k">set</span><span class="w"> </span><span class="n">TBLPROPERTIES</span><span class="w"> </span><span class="p">(</span><span class="s1">&#39;metadata_location&#39;</span><span class="o">=</span><span class="s1">&#39;&lt;path&gt;/hivemetadata/00003-a1ada2b8-fc86-4b5b-8c91-400b6b46d0f2.metadata.json&#39;</span><span class="p">);</span>
</code></pre></div>
<h2 id="dml-commands">DML Commands<a class="headerlink" href="#dml-commands" title="Permanent link">🔗</a></h2>
<h3 id="select">SELECT<a class="headerlink" href="#select" title="Permanent link">🔗</a></h3>
<p>Select statements work the same on Iceberg tables in Hive. You will see the Iceberg benefits over Hive in compilation and execution:
* <strong>No file system listings</strong> - especially important on blob stores, like S3
* <strong>No partition listing from</strong> the Metastore
* <strong>Advanced partition filtering</strong> - the partition keys are not needed in the queries when they could be calculated
* Could handle <strong>higher number of partitions</strong> than normal Hive tables</p>
<p>Here are the features highlights for Iceberg Hive read support:
1. <strong>Predicate pushdown</strong>: Pushdown of the Hive SQL <code>WHERE</code> clause has been implemented so that these filters are used at the Iceberg <code>TableScan</code> level as well as by the Parquet and ORC Readers.
2. <strong>Column projection</strong>: Columns from the Hive SQL <code>SELECT</code> clause are projected down to the Iceberg readers to reduce the number of columns read.
3. <strong>Hive query engines</strong>:
- With Hive 2.3.x, 3.1.x both the MapReduce and Tez query execution engines are supported.
- With Hive 4.0.0-alpha-1 Tez query execution engine is supported.</p>
<p>Some of the advanced / little used optimizations are not yet implemented for Iceberg tables, so you should check your individual queries.
Also currently the statistics stored in the MetaStore are used for query planning. This is something we are planning to improve in the future.</p>
<h3 id="insert-into">INSERT INTO<a class="headerlink" href="#insert-into" title="Permanent link">🔗</a></h3>
<p>Hive supports the standard single-table INSERT INTO operation:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-28-1" name="__codelineno-28-1" href="#__codelineno-28-1"></a><span class="k">INSERT</span><span class="w"> </span><span class="k">INTO</span><span class="w"> </span><span class="n">table_a</span>
<a id="__codelineno-28-2" name="__codelineno-28-2" href="#__codelineno-28-2"></a><span class="k">VALUES</span><span class="w"> </span><span class="p">(</span><span class="s1">&#39;a&#39;</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">);</span>
<a id="__codelineno-28-3" name="__codelineno-28-3" href="#__codelineno-28-3"></a><span class="k">INSERT</span><span class="w"> </span><span class="k">INTO</span><span class="w"> </span><span class="n">table_a</span>
<a id="__codelineno-28-4" name="__codelineno-28-4" href="#__codelineno-28-4"></a><span class="k">SELECT</span><span class="p">...;</span>
</code></pre></div>
<p>Multi-table insert is also supported, but it will not be atomic. Commits occur one table at a time.
Partial changes will be visible during the commit process and failures can leave partial changes committed.
Changes within a single table will remain atomic.</p>
<p>Here is an example of inserting into multiple tables at once in Hive SQL:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-29-1" name="__codelineno-29-1" href="#__codelineno-29-1"></a><span class="k">FROM</span><span class="w"> </span><span class="n">customers</span>
<a id="__codelineno-29-2" name="__codelineno-29-2" href="#__codelineno-29-2"></a><span class="w"> </span><span class="k">INSERT</span><span class="w"> </span><span class="k">INTO</span><span class="w"> </span><span class="n">target1</span><span class="w"> </span><span class="k">SELECT</span><span class="w"> </span><span class="n">customer_id</span><span class="p">,</span><span class="w"> </span><span class="n">first_name</span>
<a id="__codelineno-29-3" name="__codelineno-29-3" href="#__codelineno-29-3"></a><span class="w"> </span><span class="k">INSERT</span><span class="w"> </span><span class="k">INTO</span><span class="w"> </span><span class="n">target2</span><span class="w"> </span><span class="k">SELECT</span><span class="w"> </span><span class="n">last_name</span><span class="p">,</span><span class="w"> </span><span class="n">customer_id</span><span class="p">;</span>
</code></pre></div>
<h3 id="insert-overwrite">INSERT OVERWRITE<a class="headerlink" href="#insert-overwrite" title="Permanent link">🔗</a></h3>
<p>INSERT OVERWRITE can replace data in the table with the result of a query. Overwrites are atomic operations for Iceberg tables.
For nonpartitioned tables the content of the table is always removed. For partitioned tables the partitions
that have rows produced by the SELECT query will be replaced.
<div class="highlight"><pre><span></span><code><a id="__codelineno-30-1" name="__codelineno-30-1" href="#__codelineno-30-1"></a><span class="k">INSERT</span><span class="w"> </span><span class="n">OVERWRITE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">target</span><span class="w"> </span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="k">source</span><span class="p">;</span>
</code></pre></div></p>
<h3 id="querying-metadata-tables">QUERYING METADATA TABLES<a class="headerlink" href="#querying-metadata-tables" title="Permanent link">🔗</a></h3>
<p>Hive supports querying of the Iceberg Metadata tables. The tables could be used as normal
Hive tables, so it is possible to use projections / joins / filters / etc.
To reference a metadata table the full name of the table should be used, like:
<DB_NAME>.<TABLE_NAME>.<METADATA_TABLE_NAME>.</p>
<p>Currently the following metadata tables are available in Hive:
* files
* entries
* snapshots
* manifests
* partitions</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-31-1" name="__codelineno-31-1" href="#__codelineno-31-1"></a><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="k">default</span><span class="p">.</span><span class="n">table_a</span><span class="p">.</span><span class="n">files</span><span class="p">;</span>
</code></pre></div>
<h3 id="timetravel">TIMETRAVEL<a class="headerlink" href="#timetravel" title="Permanent link">🔗</a></h3>
<p>Hive supports snapshot id based and time base timetravel queries.
For these views it is possible to use projections / joins / filters / etc.
The function is available with the following syntax:
<div class="highlight"><pre><span></span><code><a id="__codelineno-32-1" name="__codelineno-32-1" href="#__codelineno-32-1"></a><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">table_a</span><span class="w"> </span><span class="k">FOR</span><span class="w"> </span><span class="n">SYSTEM_TIME</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="k">OF</span><span class="w"> </span><span class="s1">&#39;2021-08-09 10:35:57&#39;</span><span class="p">;</span>
<a id="__codelineno-32-2" name="__codelineno-32-2" href="#__codelineno-32-2"></a><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">table_a</span><span class="w"> </span><span class="k">FOR</span><span class="w"> </span><span class="n">SYSTEM_VERSION</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="k">OF</span><span class="w"> </span><span class="mi">1234567</span><span class="p">;</span>
</code></pre></div></p>
<p>You can expire snapshots of an Iceberg table using an ALTER TABLE query from Hive. You should periodically expire snapshots to delete data files that is no longer needed, and reduce the size of table metadata.</p>
<p>Each write to an Iceberg table from Hive creates a new snapshot, or version, of a table. Snapshots can be used for time-travel queries, or the table can be rolled back to any valid snapshot. Snapshots accumulate until they are expired by the expire_snapshots operation.
Enter a query to expire snapshots having the following timestamp: <code>2021-12-09 05:39:18.689000000</code>
<div class="highlight"><pre><span></span><code><a id="__codelineno-33-1" name="__codelineno-33-1" href="#__codelineno-33-1"></a><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">test_table</span><span class="w"> </span><span class="k">EXECUTE</span><span class="w"> </span><span class="n">expire_snapshots</span><span class="p">(</span><span class="s1">&#39;2021-12-09 05:39:18.689000000&#39;</span><span class="p">);</span>
</code></pre></div></p>
<h3 id="type-compatibility">Type compatibility<a class="headerlink" href="#type-compatibility" title="Permanent link">🔗</a></h3>
<p>Hive and Iceberg support different set of types. Iceberg can perform type conversion automatically, but not for all
combinations, so you may want to understand the type conversion in Iceberg in prior to design the types of columns in
your tables. You can enable auto-conversion through Hadoop configuration (not enabled by default):</p>
<table>
<thead>
<tr>
<th>Config key</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>iceberg.mr.schema.auto.conversion</td>
<td>false</td>
<td>if Hive should perform type auto-conversion</td>
</tr>
</tbody>
</table>
<h3 id="hive-type-to-iceberg-type">Hive type to Iceberg type<a class="headerlink" href="#hive-type-to-iceberg-type" title="Permanent link">🔗</a></h3>
<p>This type conversion table describes how Hive types are converted to the Iceberg types. The conversion applies on both
creating Iceberg table and writing to Iceberg table via Hive.</p>
<table>
<thead>
<tr>
<th>Hive</th>
<th>Iceberg</th>
<th>Notes</th>
</tr>
</thead>
<tbody>
<tr>
<td>boolean</td>
<td>boolean</td>
<td></td>
</tr>
<tr>
<td>short</td>
<td>integer</td>
<td>auto-conversion</td>
</tr>
<tr>
<td>byte</td>
<td>integer</td>
<td>auto-conversion</td>
</tr>
<tr>
<td>integer</td>
<td>integer</td>
<td></td>
</tr>
<tr>
<td>long</td>
<td>long</td>
<td></td>
</tr>
<tr>
<td>float</td>
<td>float</td>
<td></td>
</tr>
<tr>
<td>double</td>
<td>double</td>
<td></td>
</tr>
<tr>
<td>date</td>
<td>date</td>
<td></td>
</tr>
<tr>
<td>timestamp</td>
<td>timestamp without timezone</td>
<td></td>
</tr>
<tr>
<td>timestamplocaltz</td>
<td>timestamp with timezone</td>
<td>Hive 3 only</td>
</tr>
<tr>
<td>interval_year_month</td>
<td></td>
<td>not supported</td>
</tr>
<tr>
<td>interval_day_time</td>
<td></td>
<td>not supported</td>
</tr>
<tr>
<td>char</td>
<td>string</td>
<td>auto-conversion</td>
</tr>
<tr>
<td>varchar</td>
<td>string</td>
<td>auto-conversion</td>
</tr>
<tr>
<td>string</td>
<td>string</td>
<td></td>
</tr>
<tr>
<td>binary</td>
<td>binary</td>
<td></td>
</tr>
<tr>
<td>decimal</td>
<td>decimal</td>
<td></td>
</tr>
<tr>
<td>struct</td>
<td>struct</td>
<td></td>
</tr>
<tr>
<td>list</td>
<td>list</td>
<td></td>
</tr>
<tr>
<td>map</td>
<td>map</td>
<td></td>
</tr>
<tr>
<td>union</td>
<td></td>
<td>not supported</td>
</tr>
</tbody>
</table>
<h3 id="table-rollback">Table rollback<a class="headerlink" href="#table-rollback" title="Permanent link">🔗</a></h3>
<p>Rolling back iceberg table's data to the state at an older table snapshot.</p>
<p>Rollback to the last snapshot before a specific timestamp</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-34-1" name="__codelineno-34-1" href="#__codelineno-34-1"></a><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">ice_t</span><span class="w"> </span><span class="k">EXECUTE</span><span class="w"> </span><span class="k">ROLLBACK</span><span class="p">(</span><span class="s1">&#39;2022-05-12 00:00:00&#39;</span><span class="p">)</span>
</code></pre></div>
<p>Rollback to a specific snapshot ID
<div class="highlight"><pre><span></span><code><a id="__codelineno-35-1" name="__codelineno-35-1" href="#__codelineno-35-1"></a><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">ice_t</span><span class="w"> </span><span class="k">EXECUTE</span><span class="w"> </span><span class="k">ROLLBACK</span><span class="p">(</span><span class="mi">1111</span><span class="p">);</span>
</code></pre></div></p>
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