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<h1 id="flink">Flink<a class="headerlink" href="#flink" title="Permanent link">🔗</a></h1>
<p>Apache Iceberg supports both <a href="https://flink.apache.org/">Apache Flink</a>'s DataStream API and Table API. See the <a href="../../multi-engine-support.md#apache-flink">Multi-Engine Support#apache-flink</a> page for the integration of Apache Flink.</p>
<table>
<thead>
<tr>
<th>Feature support</th>
<th>Flink</th>
<th>Notes</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="#creating-catalogs-and-using-catalogs">SQL create catalog</a></td>
<td>✔️</td>
<td></td>
</tr>
<tr>
<td><a href="#create-database">SQL create database</a></td>
<td>✔️</td>
<td></td>
</tr>
<tr>
<td><a href="#create-table">SQL create table</a></td>
<td>✔️</td>
<td></td>
</tr>
<tr>
<td><a href="#create-table-like">SQL create table like</a></td>
<td>✔️</td>
<td></td>
</tr>
<tr>
<td><a href="#alter-table">SQL alter table</a></td>
<td>✔️</td>
<td>Only support altering table properties, column and partition changes are not supported</td>
</tr>
<tr>
<td><a href="#drop-table">SQL drop_table</a></td>
<td>✔️</td>
<td></td>
</tr>
<tr>
<td><a href="#querying-with-sql">SQL select</a></td>
<td>✔️</td>
<td>Support both streaming and batch mode</td>
</tr>
<tr>
<td><a href="#insert-into">SQL insert into</a></td>
<td>✔️ ️</td>
<td>Support both streaming and batch mode</td>
</tr>
<tr>
<td><a href="#insert-overwrite">SQL insert overwrite</a></td>
<td>✔️ ️</td>
<td></td>
</tr>
<tr>
<td><a href="#reading-with-datastream">DataStream read</a></td>
<td>✔️ ️</td>
<td></td>
</tr>
<tr>
<td><a href="#appending-data">DataStream append</a></td>
<td>✔️ ️</td>
<td></td>
</tr>
<tr>
<td><a href="#overwrite-data">DataStream overwrite</a></td>
<td>✔️ ️</td>
<td></td>
</tr>
<tr>
<td><a href="#inspecting-tables">Metadata tables</a></td>
<td>✔️</td>
<td></td>
</tr>
<tr>
<td><a href="#rewrite-files-action">Rewrite files action</a></td>
<td>✔️ ️</td>
<td></td>
</tr>
</tbody>
</table>
<h2 id="preparation-when-using-flink-sql-client">Preparation when using Flink SQL Client<a class="headerlink" href="#preparation-when-using-flink-sql-client" title="Permanent link">🔗</a></h2>
<p>To create Iceberg table in Flink, it is recommended to use <a href="https://ci.apache.org/projects/flink/flink-docs-stable/dev/table/sqlClient.html">Flink SQL Client</a> as it's easier for users to understand the concepts.</p>
<p>Download Flink from the <a href="https://flink.apache.org/downloads.html">Apache download page</a>. Iceberg uses Scala 2.12 when compiling the Apache <code>iceberg-flink-runtime</code> jar, so it's recommended to use Flink 1.16 bundled with Scala 2.12.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="nv">FLINK_VERSION</span><span class="o">=</span><span class="m">1</span>.16.2
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="nv">SCALA_VERSION</span><span class="o">=</span><span class="m">2</span>.12
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="nv">APACHE_FLINK_URL</span><span class="o">=</span>https://archive.apache.org/dist/flink/
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>wget<span class="w"> </span><span class="si">${</span><span class="nv">APACHE_FLINK_URL</span><span class="si">}</span>/flink-<span class="si">${</span><span class="nv">FLINK_VERSION</span><span class="si">}</span>/flink-<span class="si">${</span><span class="nv">FLINK_VERSION</span><span class="si">}</span>-bin-scala_<span class="si">${</span><span class="nv">SCALA_VERSION</span><span class="si">}</span>.tgz
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a>tar<span class="w"> </span>xzvf<span class="w"> </span>flink-<span class="si">${</span><span class="nv">FLINK_VERSION</span><span class="si">}</span>-bin-scala_<span class="si">${</span><span class="nv">SCALA_VERSION</span><span class="si">}</span>.tgz
</code></pre></div>
<p>Start a standalone Flink cluster within Hadoop environment:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="c1"># HADOOP_HOME is your hadoop root directory after unpack the binary package.</span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="nv">APACHE_HADOOP_URL</span><span class="o">=</span>https://archive.apache.org/dist/hadoop/
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="nv">HADOOP_VERSION</span><span class="o">=</span><span class="m">2</span>.8.5
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a>wget<span class="w"> </span><span class="si">${</span><span class="nv">APACHE_HADOOP_URL</span><span class="si">}</span>/common/hadoop-<span class="si">${</span><span class="nv">HADOOP_VERSION</span><span class="si">}</span>/hadoop-<span class="si">${</span><span class="nv">HADOOP_VERSION</span><span class="si">}</span>.tar.gz
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a>tar<span class="w"> </span>xzvf<span class="w"> </span>hadoop-<span class="si">${</span><span class="nv">HADOOP_VERSION</span><span class="si">}</span>.tar.gz
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="nv">HADOOP_HOME</span><span class="o">=</span><span class="sb">`</span><span class="nb">pwd</span><span class="sb">`</span>/hadoop-<span class="si">${</span><span class="nv">HADOOP_VERSION</span><span class="si">}</span>
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a>
<a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="nb">export</span><span class="w"> </span><span class="nv">HADOOP_CLASSPATH</span><span class="o">=</span><span class="sb">`</span><span class="nv">$HADOOP_HOME</span>/bin/hadoop<span class="w"> </span>classpath<span class="sb">`</span>
<a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a>
<a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="c1"># Start the flink standalone cluster</span>
<a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a>./bin/start-cluster.sh
</code></pre></div>
<p>Start the Flink SQL client. There is a separate <code>flink-runtime</code> module in the Iceberg project to generate a bundled jar, which could be loaded by Flink SQL client directly. To build the <code>flink-runtime</code> bundled jar manually, build the <code>iceberg</code> project, and it will generate the jar under <code>&lt;iceberg-root-dir&gt;/flink-runtime/build/libs</code>. Or download the <code>flink-runtime</code> jar from the <a href="https://repo.maven.apache.org/maven2/org/apache/iceberg/iceberg-flink-runtime-1.16/1.5.2/">Apache repository</a>.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="c1"># HADOOP_HOME is your hadoop root directory after unpack the binary package.</span>
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="nb">export</span><span class="w"> </span><span class="nv">HADOOP_CLASSPATH</span><span class="o">=</span><span class="sb">`</span><span class="nv">$HADOOP_HOME</span>/bin/hadoop<span class="w"> </span>classpath<span class="sb">`</span><span class="w"> </span>
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="c1"># Below works for 1.15 or less</span>
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a>./bin/sql-client.sh<span class="w"> </span>embedded<span class="w"> </span>-j<span class="w"> </span>&lt;flink-runtime-directory&gt;/iceberg-flink-runtime-1.15-1.5.2.jar<span class="w"> </span>shell
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a>
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="c1"># 1.16 or above has a regression in loading external jar via -j option. See FLINK-30035 for details.</span>
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a>put<span class="w"> </span>iceberg-flink-runtime-1.16-1.5.2.jar<span class="w"> </span><span class="k">in</span><span class="w"> </span>flink/lib<span class="w"> </span>dir
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a>./bin/sql-client.sh<span class="w"> </span>embedded<span class="w"> </span>shell
</code></pre></div>
<p>By default, Iceberg ships with Hadoop jars for Hadoop catalog. To use Hive catalog, load the Hive jars when opening the Flink SQL client. Fortunately, Flink has provided a <a href="https://repo.maven.apache.org/maven2/org/apache/flink/flink-sql-connector-hive-2.3.9_2.12/1.16.2/flink-sql-connector-hive-2.3.9_2.12-1.16.2.jar">bundled hive jar</a> for the SQL client. An example on how to download the dependencies and get started:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="c1"># HADOOP_HOME is your hadoop root directory after unpack the binary package.</span>
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="nb">export</span><span class="w"> </span><span class="nv">HADOOP_CLASSPATH</span><span class="o">=</span><span class="sb">`</span><span class="nv">$HADOOP_HOME</span>/bin/hadoop<span class="w"> </span>classpath<span class="sb">`</span>
<a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a>
<a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="nv">ICEBERG_VERSION</span><span class="o">=</span><span class="m">1</span>.5.2
<a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="nv">MAVEN_URL</span><span class="o">=</span>https://repo1.maven.org/maven2
<a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="nv">ICEBERG_MAVEN_URL</span><span class="o">=</span><span class="si">${</span><span class="nv">MAVEN_URL</span><span class="si">}</span>/org/apache/iceberg
<a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="nv">ICEBERG_PACKAGE</span><span class="o">=</span>iceberg-flink-runtime
<a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a>wget<span class="w"> </span><span class="si">${</span><span class="nv">ICEBERG_MAVEN_URL</span><span class="si">}</span>/<span class="si">${</span><span class="nv">ICEBERG_PACKAGE</span><span class="si">}</span>-<span class="si">${</span><span class="nv">FLINK_VERSION_MAJOR</span><span class="si">}</span>/<span class="si">${</span><span class="nv">ICEBERG_VERSION</span><span class="si">}</span>/<span class="si">${</span><span class="nv">ICEBERG_PACKAGE</span><span class="si">}</span>-<span class="si">${</span><span class="nv">FLINK_VERSION_MAJOR</span><span class="si">}</span>-<span class="si">${</span><span class="nv">ICEBERG_VERSION</span><span class="si">}</span>.jar<span class="w"> </span>-P<span class="w"> </span>lib/
<a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a>
<a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a><span class="nv">HIVE_VERSION</span><span class="o">=</span><span class="m">2</span>.3.9
<a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a><span class="nv">SCALA_VERSION</span><span class="o">=</span><span class="m">2</span>.12
<a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a><span class="nv">FLINK_VERSION</span><span class="o">=</span><span class="m">1</span>.16.2
<a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a><span class="nv">FLINK_CONNECTOR_URL</span><span class="o">=</span><span class="si">${</span><span class="nv">MAVEN_URL</span><span class="si">}</span>/org/apache/flink
<a id="__codelineno-3-14" name="__codelineno-3-14" href="#__codelineno-3-14"></a><span class="nv">FLINK_CONNECTOR_PACKAGE</span><span class="o">=</span>flink-sql-connector-hive
<a id="__codelineno-3-15" name="__codelineno-3-15" href="#__codelineno-3-15"></a>wget<span class="w"> </span><span class="si">${</span><span class="nv">FLINK_CONNECTOR_URL</span><span class="si">}</span>/<span class="si">${</span><span class="nv">FLINK_CONNECTOR_PACKAGE</span><span class="si">}</span>-<span class="si">${</span><span class="nv">HIVE_VERSION</span><span class="si">}</span>_<span class="si">${</span><span class="nv">SCALA_VERSION</span><span class="si">}</span>/<span class="si">${</span><span class="nv">FLINK_VERSION</span><span class="si">}</span>/<span class="si">${</span><span class="nv">FLINK_CONNECTOR_PACKAGE</span><span class="si">}</span>-<span class="si">${</span><span class="nv">HIVE_VERSION</span><span class="si">}</span>_<span class="si">${</span><span class="nv">SCALA_VERSION</span><span class="si">}</span>-<span class="si">${</span><span class="nv">FLINK_VERSION</span><span class="si">}</span>.jar
<a id="__codelineno-3-16" name="__codelineno-3-16" href="#__codelineno-3-16"></a>
<a id="__codelineno-3-17" name="__codelineno-3-17" href="#__codelineno-3-17"></a>./bin/sql-client.sh<span class="w"> </span>embedded<span class="w"> </span>shell
</code></pre></div>
<h2 id="flinks-python-api">Flink's Python API<a class="headerlink" href="#flinks-python-api" title="Permanent link">🔗</a></h2>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>PyFlink 1.6.1 <a href="https://issues.apache.org/jira/browse/FLINK-28786">does not work on OSX with a M1 cpu</a></p>
</div>
<p>Install the Apache Flink dependency using <code>pip</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="n">pip</span> <span class="n">install</span> <span class="n">apache</span><span class="o">-</span><span class="n">flink</span><span class="o">==</span><span class="mf">1.16.2</span>
</code></pre></div>
<p>Provide a <code>file://</code> path to the <code>iceberg-flink-runtime</code> jar, which can be obtained by building the project and looking at <code>&lt;iceberg-root-dir&gt;/flink-runtime/build/libs</code>, or downloading it from the <a href="https://repo.maven.apache.org/maven2/org/apache/iceberg/iceberg-flink-runtime/">Apache official repository</a>. Third-party jars can be added to <code>pyflink</code> via:</p>
<ul>
<li><code>env.add_jars("file:///my/jar/path/connector.jar")</code></li>
<li><code>table_env.get_config().get_configuration().set_string("pipeline.jars", "file:///my/jar/path/connector.jar")</code></li>
</ul>
<p>This is also mentioned in the official <a href="https://ci.apache.org/projects/flink/flink-docs-release-1.16/docs/dev/python/dependency_management/">docs</a>. The example below uses <code>env.add_jars(..)</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="kn">import</span> <span class="nn">os</span>
<a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a>
<a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a><span class="kn">from</span> <span class="nn">pyflink.datastream</span> <span class="kn">import</span> <span class="n">StreamExecutionEnvironment</span>
<a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a>
<a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a><span class="n">env</span> <span class="o">=</span> <span class="n">StreamExecutionEnvironment</span><span class="o">.</span><span class="n">get_execution_environment</span><span class="p">()</span>
<a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a><span class="n">iceberg_flink_runtime_jar</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">getcwd</span><span class="p">(),</span> <span class="s2">&quot;iceberg-flink-runtime-1.16-1.5.2.jar&quot;</span><span class="p">)</span>
<a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a>
<a id="__codelineno-5-8" name="__codelineno-5-8" href="#__codelineno-5-8"></a><span class="n">env</span><span class="o">.</span><span class="n">add_jars</span><span class="p">(</span><span class="s2">&quot;file://</span><span class="si">{}</span><span class="s2">&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">iceberg_flink_runtime_jar</span><span class="p">))</span>
</code></pre></div>
<p>Next, create a <code>StreamTableEnvironment</code> and execute Flink SQL statements. The below example shows how to create a custom catalog via the Python Table API:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="kn">from</span> <span class="nn">pyflink.table</span> <span class="kn">import</span> <span class="n">StreamTableEnvironment</span>
<a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a><span class="n">table_env</span> <span class="o">=</span> <span class="n">StreamTableEnvironment</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">env</span><span class="p">)</span>
<a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a><span class="n">table_env</span><span class="o">.</span><span class="n">execute_sql</span><span class="p">(</span><span class="s2">&quot;&quot;&quot;</span>
<a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a><span class="s2">CREATE CATALOG my_catalog WITH (</span>
<a id="__codelineno-6-5" name="__codelineno-6-5" href="#__codelineno-6-5"></a><span class="s2"> &#39;type&#39;=&#39;iceberg&#39;, </span>
<a id="__codelineno-6-6" name="__codelineno-6-6" href="#__codelineno-6-6"></a><span class="s2"> &#39;catalog-impl&#39;=&#39;com.my.custom.CatalogImpl&#39;,</span>
<a id="__codelineno-6-7" name="__codelineno-6-7" href="#__codelineno-6-7"></a><span class="s2"> &#39;my-additional-catalog-config&#39;=&#39;my-value&#39;</span>
<a id="__codelineno-6-8" name="__codelineno-6-8" href="#__codelineno-6-8"></a><span class="s2">)</span>
<a id="__codelineno-6-9" name="__codelineno-6-9" href="#__codelineno-6-9"></a><span class="s2">&quot;&quot;&quot;</span><span class="p">)</span>
</code></pre></div>
<p>Run a query:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a><span class="p">(</span><span class="n">table_env</span>
<a id="__codelineno-7-2" name="__codelineno-7-2" href="#__codelineno-7-2"></a> <span class="o">.</span><span class="n">sql_query</span><span class="p">(</span><span class="s2">&quot;SELECT PULocationID, DOLocationID, passenger_count FROM my_catalog.nyc.taxis LIMIT 5&quot;</span><span class="p">)</span>
<a id="__codelineno-7-3" name="__codelineno-7-3" href="#__codelineno-7-3"></a> <span class="o">.</span><span class="n">execute</span><span class="p">()</span>
<a id="__codelineno-7-4" name="__codelineno-7-4" href="#__codelineno-7-4"></a> <span class="o">.</span><span class="n">print</span><span class="p">())</span>
</code></pre></div>
<div class="highlight"><pre><span></span><code><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a>+----+----------------------+----------------------+--------------------------------+
<a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a>| op | PULocationID | DOLocationID | passenger_count |
<a id="__codelineno-8-3" name="__codelineno-8-3" href="#__codelineno-8-3"></a>+----+----------------------+----------------------+--------------------------------+
<a id="__codelineno-8-4" name="__codelineno-8-4" href="#__codelineno-8-4"></a>| +I | 249 | 48 | 1.0 |
<a id="__codelineno-8-5" name="__codelineno-8-5" href="#__codelineno-8-5"></a>| +I | 132 | 233 | 1.0 |
<a id="__codelineno-8-6" name="__codelineno-8-6" href="#__codelineno-8-6"></a>| +I | 164 | 107 | 1.0 |
<a id="__codelineno-8-7" name="__codelineno-8-7" href="#__codelineno-8-7"></a>| +I | 90 | 229 | 1.0 |
<a id="__codelineno-8-8" name="__codelineno-8-8" href="#__codelineno-8-8"></a>| +I | 137 | 249 | 1.0 |
<a id="__codelineno-8-9" name="__codelineno-8-9" href="#__codelineno-8-9"></a>+----+----------------------+----------------------+--------------------------------+
<a id="__codelineno-8-10" name="__codelineno-8-10" href="#__codelineno-8-10"></a>5 rows in set
</code></pre></div>
<p>For more details, please refer to the <a href="https://ci.apache.org/projects/flink/flink-docs-release-1.16/docs/dev/python/table/intro_to_table_api/">Python Table API</a>.</p>
<h2 id="adding-catalogs">Adding catalogs.<a class="headerlink" href="#adding-catalogs" title="Permanent link">🔗</a></h2>
<p>Flink support to create catalogs by using Flink SQL.</p>
<h3 id="catalog-configuration">Catalog Configuration<a class="headerlink" href="#catalog-configuration" title="Permanent link">🔗</a></h3>
<p>A catalog is created and named by executing the following query (replace <code>&lt;catalog_name&gt;</code> with your catalog name and
<code>&lt;config_key&gt;</code>=<code>&lt;config_value&gt;</code> with catalog implementation config):</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">CREATE</span><span class="w"> </span><span class="k">CATALOG</span><span class="w"> </span><span class="o">&lt;</span><span class="k">catalog_name</span><span class="o">&gt;</span><span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="p">(</span>
<a id="__codelineno-9-2" name="__codelineno-9-2" href="#__codelineno-9-2"></a><span class="w"> </span><span class="s1">&#39;type&#39;</span><span class="o">=</span><span class="s1">&#39;iceberg&#39;</span><span class="p">,</span>
<a id="__codelineno-9-3" name="__codelineno-9-3" href="#__codelineno-9-3"></a><span class="w"> </span><span class="o">`&lt;</span><span class="n">config_key</span><span class="o">&gt;`=`&lt;</span><span class="n">config_value</span><span class="o">&gt;`</span>
<a id="__codelineno-9-4" name="__codelineno-9-4" href="#__codelineno-9-4"></a><span class="p">);</span><span class="w"> </span>
</code></pre></div>
<p>The following properties can be set globally and are not limited to a specific catalog implementation:</p>
<ul>
<li><code>type</code>: Must be <code>iceberg</code>. (required)</li>
<li><code>catalog-type</code>: <code>hive</code>, <code>hadoop</code> or <code>rest</code> for built-in catalogs, or left unset for custom catalog implementations using catalog-impl. (Optional)</li>
<li><code>catalog-impl</code>: The fully-qualified class name of a custom catalog implementation. Must be set if <code>catalog-type</code> is unset. (Optional)</li>
<li><code>property-version</code>: Version number to describe the property version. This property can be used for backwards compatibility in case the property format changes. The current property version is <code>1</code>. (Optional)</li>
<li><code>cache-enabled</code>: Whether to enable catalog cache, default value is <code>true</code>. (Optional)</li>
<li><code>cache.expiration-interval-ms</code>: How long catalog entries are locally cached, in milliseconds; negative values like <code>-1</code> will disable expiration, value 0 is not allowed to set. default value is <code>-1</code>. (Optional)</li>
</ul>
<h3 id="hive-catalog">Hive catalog<a class="headerlink" href="#hive-catalog" title="Permanent link">🔗</a></h3>
<p>This creates an Iceberg catalog named <code>hive_catalog</code> that can be configured using <code>'catalog-type'='hive'</code>, which loads tables from Hive metastore:</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">CATALOG</span><span class="w"> </span><span class="n">hive_catalog</span><span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="p">(</span>
<a id="__codelineno-10-2" name="__codelineno-10-2" href="#__codelineno-10-2"></a><span class="w"> </span><span class="s1">&#39;type&#39;</span><span class="o">=</span><span class="s1">&#39;iceberg&#39;</span><span class="p">,</span>
<a id="__codelineno-10-3" name="__codelineno-10-3" href="#__codelineno-10-3"></a><span class="w"> </span><span class="s1">&#39;catalog-type&#39;</span><span class="o">=</span><span class="s1">&#39;hive&#39;</span><span class="p">,</span>
<a id="__codelineno-10-4" name="__codelineno-10-4" href="#__codelineno-10-4"></a><span class="w"> </span><span class="s1">&#39;uri&#39;</span><span class="o">=</span><span class="s1">&#39;thrift://localhost:9083&#39;</span><span class="p">,</span>
<a id="__codelineno-10-5" name="__codelineno-10-5" href="#__codelineno-10-5"></a><span class="w"> </span><span class="s1">&#39;clients&#39;</span><span class="o">=</span><span class="s1">&#39;5&#39;</span><span class="p">,</span>
<a id="__codelineno-10-6" name="__codelineno-10-6" href="#__codelineno-10-6"></a><span class="w"> </span><span class="s1">&#39;property-version&#39;</span><span class="o">=</span><span class="s1">&#39;1&#39;</span><span class="p">,</span>
<a id="__codelineno-10-7" name="__codelineno-10-7" href="#__codelineno-10-7"></a><span class="w"> </span><span class="s1">&#39;warehouse&#39;</span><span class="o">=</span><span class="s1">&#39;hdfs://nn:8020/warehouse/path&#39;</span>
<a id="__codelineno-10-8" name="__codelineno-10-8" href="#__codelineno-10-8"></a><span class="p">);</span>
</code></pre></div>
<p>The following properties can be set if using the Hive catalog:</p>
<ul>
<li><code>uri</code>: The Hive metastore's thrift URI. (Required)</li>
<li><code>clients</code>: The Hive metastore client pool size, default value is 2. (Optional)</li>
<li><code>warehouse</code>: The Hive warehouse location, users should specify this path if neither set the <code>hive-conf-dir</code> to specify a location containing a <code>hive-site.xml</code> configuration file nor add a correct <code>hive-site.xml</code> to classpath.</li>
<li><code>hive-conf-dir</code>: Path to a directory containing a <code>hive-site.xml</code> configuration file which will be used to provide custom Hive configuration values. The value of <code>hive.metastore.warehouse.dir</code> from <code>&lt;hive-conf-dir&gt;/hive-site.xml</code> (or hive configure file from classpath) will be overwritten with the <code>warehouse</code> value if setting both <code>hive-conf-dir</code> and <code>warehouse</code> when creating iceberg catalog.</li>
<li><code>hadoop-conf-dir</code>: Path to a directory containing <code>core-site.xml</code> and <code>hdfs-site.xml</code> configuration files which will be used to provide custom Hadoop configuration values.</li>
</ul>
<h2 id="creating-a-table">Creating a table<a class="headerlink" href="#creating-a-table" title="Permanent link">🔗</a></h2>
<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="o">`</span><span class="n">hive_catalog</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="k">default</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">sample</span><span class="o">`</span><span class="w"> </span><span class="p">(</span>
<a id="__codelineno-11-2" name="__codelineno-11-2" href="#__codelineno-11-2"></a><span class="w"> </span><span class="n">id</span><span class="w"> </span><span class="nb">BIGINT</span><span class="w"> </span><span class="k">COMMENT</span><span class="w"> </span><span class="s1">&#39;unique id&#39;</span><span class="p">,</span>
<a id="__codelineno-11-3" name="__codelineno-11-3" href="#__codelineno-11-3"></a><span class="w"> </span><span class="k">data</span><span class="w"> </span><span class="n">STRING</span>
<a id="__codelineno-11-4" name="__codelineno-11-4" href="#__codelineno-11-4"></a><span class="p">);</span>
</code></pre></div>
<h2 id="writing">Writing<a class="headerlink" href="#writing" title="Permanent link">🔗</a></h2>
<p>To append new data to a table with a Flink streaming job, use <code>INSERT INTO</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-12-1" name="__codelineno-12-1" href="#__codelineno-12-1"></a><span class="k">INSERT</span><span class="w"> </span><span class="k">INTO</span><span class="w"> </span><span class="o">`</span><span class="n">hive_catalog</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="k">default</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">sample</span><span class="o">`</span><span class="w"> </span><span class="k">VALUES</span><span class="w"> </span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;a&#39;</span><span class="p">);</span>
<a id="__codelineno-12-2" name="__codelineno-12-2" href="#__codelineno-12-2"></a><span class="k">INSERT</span><span class="w"> </span><span class="k">INTO</span><span class="w"> </span><span class="o">`</span><span class="n">hive_catalog</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="k">default</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">sample</span><span class="o">`</span><span class="w"> </span><span class="k">SELECT</span><span class="w"> </span><span class="n">id</span><span class="p">,</span><span class="w"> </span><span class="k">data</span><span class="w"> </span><span class="k">from</span><span class="w"> </span><span class="n">other_kafka_table</span><span class="p">;</span>
</code></pre></div>
<p>To replace data in the table with the result of a query, use <code>INSERT OVERWRITE</code> in batch job (flink streaming job does not support <code>INSERT OVERWRITE</code>). Overwrites are atomic operations for Iceberg tables.</p>
<p>Partitions that have rows produced by the SELECT query will be replaced, for example:</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">INSERT</span><span class="w"> </span><span class="n">OVERWRITE</span><span class="w"> </span><span class="o">`</span><span class="n">hive_catalog</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="k">default</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">sample</span><span class="o">`</span><span class="w"> </span><span class="k">VALUES</span><span class="w"> </span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;a&#39;</span><span class="p">);</span>
</code></pre></div>
<p>Iceberg also support overwriting given partitions by the <code>select</code> values:</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">INSERT</span><span class="w"> </span><span class="n">OVERWRITE</span><span class="w"> </span><span class="o">`</span><span class="n">hive_catalog</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="k">default</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">sample</span><span class="o">`</span><span class="w"> </span><span class="n">PARTITION</span><span class="p">(</span><span class="k">data</span><span class="o">=</span><span class="s1">&#39;a&#39;</span><span class="p">)</span><span class="w"> </span><span class="k">SELECT</span><span class="w"> </span><span class="mi">6</span><span class="p">;</span>
</code></pre></div>
<p>Flink supports writing <code>DataStream&lt;RowData&gt;</code> and <code>DataStream&lt;Row&gt;</code> to the sink iceberg table natively.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-15-1" name="__codelineno-15-1" href="#__codelineno-15-1"></a><span class="n">StreamExecutionEnvironment</span><span class="w"> </span><span class="n">env</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">...;</span>
<a id="__codelineno-15-2" name="__codelineno-15-2" href="#__codelineno-15-2"></a>
<a id="__codelineno-15-3" name="__codelineno-15-3" href="#__codelineno-15-3"></a><span class="n">DataStream</span><span class="o">&lt;</span><span class="n">RowData</span><span class="o">&gt;</span><span class="w"> </span><span class="n">input</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">...</span><span class="w"> </span><span class="p">;</span>
<a id="__codelineno-15-4" name="__codelineno-15-4" href="#__codelineno-15-4"></a><span class="n">Configuration</span><span class="w"> </span><span class="n">hadoopConf</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">Configuration</span><span class="p">();</span>
<a id="__codelineno-15-5" name="__codelineno-15-5" href="#__codelineno-15-5"></a><span class="n">TableLoader</span><span class="w"> </span><span class="n">tableLoader</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">TableLoader</span><span class="p">.</span><span class="na">fromHadoopTable</span><span class="p">(</span><span class="s">&quot;hdfs://nn:8020/warehouse/path&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">hadoopConf</span><span class="p">);</span>
<a id="__codelineno-15-6" name="__codelineno-15-6" href="#__codelineno-15-6"></a>
<a id="__codelineno-15-7" name="__codelineno-15-7" href="#__codelineno-15-7"></a><span class="n">FlinkSink</span><span class="p">.</span><span class="na">forRowData</span><span class="p">(</span><span class="n">input</span><span class="p">)</span>
<a id="__codelineno-15-8" name="__codelineno-15-8" href="#__codelineno-15-8"></a><span class="w"> </span><span class="p">.</span><span class="na">tableLoader</span><span class="p">(</span><span class="n">tableLoader</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="p">.</span><span class="na">append</span><span class="p">();</span>
<a id="__codelineno-15-10" name="__codelineno-15-10" href="#__codelineno-15-10"></a>
<a id="__codelineno-15-11" name="__codelineno-15-11" href="#__codelineno-15-11"></a><span class="n">env</span><span class="p">.</span><span class="na">execute</span><span class="p">(</span><span class="s">&quot;Test Iceberg DataStream&quot;</span><span class="p">);</span>
</code></pre></div>
<h3 id="branch-writes">Branch Writes<a class="headerlink" href="#branch-writes" title="Permanent link">🔗</a></h3>
<p>Writing to branches in Iceberg tables is also supported via the <code>toBranch</code> API in <code>FlinkSink</code>
For more information on branches please refer to <a href="../branching/">branches</a>.
<div class="highlight"><pre><span></span><code><a id="__codelineno-16-1" name="__codelineno-16-1" href="#__codelineno-16-1"></a><span class="n">FlinkSink</span><span class="p">.</span><span class="na">forRowData</span><span class="p">(</span><span class="n">input</span><span class="p">)</span>
<a id="__codelineno-16-2" name="__codelineno-16-2" href="#__codelineno-16-2"></a><span class="w"> </span><span class="p">.</span><span class="na">tableLoader</span><span class="p">(</span><span class="n">tableLoader</span><span class="p">)</span>
<a id="__codelineno-16-3" name="__codelineno-16-3" href="#__codelineno-16-3"></a><span class="w"> </span><span class="p">.</span><span class="na">toBranch</span><span class="p">(</span><span class="s">&quot;audit-branch&quot;</span><span class="p">)</span>
<a id="__codelineno-16-4" name="__codelineno-16-4" href="#__codelineno-16-4"></a><span class="w"> </span><span class="p">.</span><span class="na">append</span><span class="p">();</span>
</code></pre></div></p>
<h2 id="reading">Reading<a class="headerlink" href="#reading" title="Permanent link">🔗</a></h2>
<p>Submit a Flink <strong>batch</strong> job using the following sentences:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-17-1" name="__codelineno-17-1" href="#__codelineno-17-1"></a><span class="c1">-- Execute the flink job in batch mode for current session context</span>
<a id="__codelineno-17-2" name="__codelineno-17-2" href="#__codelineno-17-2"></a><span class="k">SET</span><span class="w"> </span><span class="n">execution</span><span class="p">.</span><span class="n">runtime</span><span class="o">-</span><span class="k">mode</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">batch</span><span class="p">;</span>
<a id="__codelineno-17-3" name="__codelineno-17-3" href="#__codelineno-17-3"></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="o">`</span><span class="n">hive_catalog</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="k">default</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">sample</span><span class="o">`</span><span class="p">;</span>
</code></pre></div>
<p>Iceberg supports processing incremental data in flink <strong>streaming</strong> jobs which starts from a historical snapshot-id:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-18-1" name="__codelineno-18-1" href="#__codelineno-18-1"></a><span class="c1">-- Submit the flink job in streaming mode for current session.</span>
<a id="__codelineno-18-2" name="__codelineno-18-2" href="#__codelineno-18-2"></a><span class="k">SET</span><span class="w"> </span><span class="n">execution</span><span class="p">.</span><span class="n">runtime</span><span class="o">-</span><span class="k">mode</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">streaming</span><span class="p">;</span>
<a id="__codelineno-18-3" name="__codelineno-18-3" href="#__codelineno-18-3"></a>
<a id="__codelineno-18-4" name="__codelineno-18-4" href="#__codelineno-18-4"></a><span class="c1">-- Enable this switch because streaming read SQL will provide few job options in flink SQL hint options.</span>
<a id="__codelineno-18-5" name="__codelineno-18-5" href="#__codelineno-18-5"></a><span class="k">SET</span><span class="w"> </span><span class="k">table</span><span class="p">.</span><span class="k">dynamic</span><span class="o">-</span><span class="k">table</span><span class="o">-</span><span class="k">options</span><span class="p">.</span><span class="n">enabled</span><span class="o">=</span><span class="k">true</span><span class="p">;</span>
<a id="__codelineno-18-6" name="__codelineno-18-6" href="#__codelineno-18-6"></a>
<a id="__codelineno-18-7" name="__codelineno-18-7" href="#__codelineno-18-7"></a><span class="c1">-- Read all the records from the iceberg current snapshot, and then read incremental data starting from that snapshot.</span>
<a id="__codelineno-18-8" name="__codelineno-18-8" href="#__codelineno-18-8"></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="o">`</span><span class="n">hive_catalog</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="k">default</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">sample</span><span class="o">`</span><span class="w"> </span><span class="cm">/*+ OPTIONS(&#39;streaming&#39;=&#39;true&#39;, &#39;monitor-interval&#39;=&#39;1s&#39;)*/</span><span class="w"> </span><span class="p">;</span>
<a id="__codelineno-18-9" name="__codelineno-18-9" href="#__codelineno-18-9"></a>
<a id="__codelineno-18-10" name="__codelineno-18-10" href="#__codelineno-18-10"></a><span class="c1">-- Read all incremental data starting from the snapshot-id &#39;3821550127947089987&#39; (records from this snapshot will be excluded).</span>
<a id="__codelineno-18-11" name="__codelineno-18-11" href="#__codelineno-18-11"></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="o">`</span><span class="n">hive_catalog</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="k">default</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">sample</span><span class="o">`</span><span class="w"> </span><span class="cm">/*+ OPTIONS(&#39;streaming&#39;=&#39;true&#39;, &#39;monitor-interval&#39;=&#39;1s&#39;, &#39;start-snapshot-id&#39;=&#39;3821550127947089987&#39;)*/</span><span class="w"> </span><span class="p">;</span>
</code></pre></div>
<p>SQL is also the recommended way to inspect tables. To view all of the snapshots in a table, use the snapshots metadata table:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-19-1" name="__codelineno-19-1" href="#__codelineno-19-1"></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="o">`</span><span class="n">hive_catalog</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="k">default</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">sample</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">snapshots</span><span class="o">`</span>
</code></pre></div>
<p>Iceberg support streaming or batch read in Java API:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-20-1" name="__codelineno-20-1" href="#__codelineno-20-1"></a>DataStream&lt;RowData&gt; batch = FlinkSource.forRowData()
<a id="__codelineno-20-2" name="__codelineno-20-2" href="#__codelineno-20-2"></a> .env(env)
<a id="__codelineno-20-3" name="__codelineno-20-3" href="#__codelineno-20-3"></a> .tableLoader(tableLoader)
<a id="__codelineno-20-4" name="__codelineno-20-4" href="#__codelineno-20-4"></a> .streaming(false)
<a id="__codelineno-20-5" name="__codelineno-20-5" href="#__codelineno-20-5"></a> .build();
</code></pre></div>
<h2 id="type-conversion">Type conversion<a class="headerlink" href="#type-conversion" title="Permanent link">🔗</a></h2>
<p>Iceberg's integration for Flink automatically converts between Flink and Iceberg types. When writing to a table with types that are not supported by Flink, like UUID, Iceberg will accept and convert values from the Flink type.</p>
<h3 id="flink-to-iceberg">Flink to Iceberg<a class="headerlink" href="#flink-to-iceberg" title="Permanent link">🔗</a></h3>
<p>Flink types are converted to Iceberg types according to the following table:</p>
<table>
<thead>
<tr>
<th>Flink</th>
<th>Iceberg</th>
<th>Notes</th>
</tr>
</thead>
<tbody>
<tr>
<td>boolean</td>
<td>boolean</td>
<td></td>
</tr>
<tr>
<td>tinyint</td>
<td>integer</td>
<td></td>
</tr>
<tr>
<td>smallint</td>
<td>integer</td>
<td></td>
</tr>
<tr>
<td>integer</td>
<td>integer</td>
<td></td>
</tr>
<tr>
<td>bigint</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>char</td>
<td>string</td>
<td></td>
</tr>
<tr>
<td>varchar</td>
<td>string</td>
<td></td>
</tr>
<tr>
<td>string</td>
<td>string</td>
<td></td>
</tr>
<tr>
<td>binary</td>
<td>binary</td>
<td></td>
</tr>
<tr>
<td>varbinary</td>
<td>fixed</td>
<td></td>
</tr>
<tr>
<td>decimal</td>
<td>decimal</td>
<td></td>
</tr>
<tr>
<td>date</td>
<td>date</td>
<td></td>
</tr>
<tr>
<td>time</td>
<td>time</td>
<td></td>
</tr>
<tr>
<td>timestamp</td>
<td>timestamp without timezone</td>
<td></td>
</tr>
<tr>
<td>timestamp_ltz</td>
<td>timestamp with timezone</td>
<td></td>
</tr>
<tr>
<td>array</td>
<td>list</td>
<td></td>
</tr>
<tr>
<td>map</td>
<td>map</td>
<td></td>
</tr>
<tr>
<td>multiset</td>
<td>map</td>
<td></td>
</tr>
<tr>
<td>row</td>
<td>struct</td>
<td></td>
</tr>
<tr>
<td>raw</td>
<td></td>
<td>Not supported</td>
</tr>
<tr>
<td>interval</td>
<td></td>
<td>Not supported</td>
</tr>
<tr>
<td>structured</td>
<td></td>
<td>Not supported</td>
</tr>
<tr>
<td>timestamp with zone</td>
<td></td>
<td>Not supported</td>
</tr>
<tr>
<td>distinct</td>
<td></td>
<td>Not supported</td>
</tr>
<tr>
<td>null</td>
<td></td>
<td>Not supported</td>
</tr>
<tr>
<td>symbol</td>
<td></td>
<td>Not supported</td>
</tr>
<tr>
<td>logical</td>
<td></td>
<td>Not supported</td>
</tr>
</tbody>
</table>
<h3 id="iceberg-to-flink">Iceberg to Flink<a class="headerlink" href="#iceberg-to-flink" title="Permanent link">🔗</a></h3>
<p>Iceberg types are converted to Flink types according to the following table:</p>
<table>
<thead>
<tr>
<th>Iceberg</th>
<th>Flink</th>
</tr>
</thead>
<tbody>
<tr>
<td>boolean</td>
<td>boolean</td>
</tr>
<tr>
<td>struct</td>
<td>row</td>
</tr>
<tr>
<td>list</td>
<td>array</td>
</tr>
<tr>
<td>map</td>
<td>map</td>
</tr>
<tr>
<td>integer</td>
<td>integer</td>
</tr>
<tr>
<td>long</td>
<td>bigint</td>
</tr>
<tr>
<td>float</td>
<td>float</td>
</tr>
<tr>
<td>double</td>
<td>double</td>
</tr>
<tr>
<td>date</td>
<td>date</td>
</tr>
<tr>
<td>time</td>
<td>time</td>
</tr>
<tr>
<td>timestamp without timezone</td>
<td>timestamp(6)</td>
</tr>
<tr>
<td>timestamp with timezone</td>
<td>timestamp_ltz(6)</td>
</tr>
<tr>
<td>string</td>
<td>varchar(2147483647)</td>
</tr>
<tr>
<td>uuid</td>
<td>binary(16)</td>
</tr>
<tr>
<td>fixed(N)</td>
<td>binary(N)</td>
</tr>
<tr>
<td>binary</td>
<td>varbinary(2147483647)</td>
</tr>
<tr>
<td>decimal(P, S)</td>
<td>decimal(P, S)</td>
</tr>
</tbody>
</table>
<h2 id="future-improvements">Future improvements<a class="headerlink" href="#future-improvements" title="Permanent link">🔗</a></h2>
<p>There are some features that are do not yet supported in the current Flink Iceberg integration work:</p>
<ul>
<li>Don't support creating iceberg table with hidden partitioning. <a href="http://mail-archives.apache.org/mod_mbox/flink-dev/202008.mbox/%3cCABi+2jQCo3MsOa4+ywaxV5J-Z8TGKNZDX-pQLYB-dG+dVUMiMw@mail.gmail.com%3e">Discussion</a> in flink mail list.</li>
<li>Don't support creating iceberg table with computed column.</li>
<li>Don't support creating iceberg table with watermark.</li>
<li>Don't support adding columns, removing columns, renaming columns, changing columns. <a href="https://issues.apache.org/jira/browse/FLINK-19062">FLINK-19062</a> is tracking this.</li>
</ul>
</article>
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