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<h1 id="spark-queries">Spark Queries<a class="headerlink" href="#spark-queries" title="Permanent link">🔗</a></h1>
<p>To use Iceberg in Spark, first configure <a href="../spark-configuration/">Spark catalogs</a>. Iceberg uses Apache Spark's DataSourceV2 API for data source and catalog implementations.</p>
<h2 id="querying-with-sql">Querying with SQL<a class="headerlink" href="#querying-with-sql" title="Permanent link">🔗</a></h2>
<p>In Spark 3, tables use identifiers that include a <a href="../spark-configuration/#using-catalogs">catalog name</a>.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">;</span><span class="w"> </span><span class="c1">-- catalog: prod, namespace: db, table: table</span>
</code></pre></div>
<p>Metadata tables, like <code>history</code> and <code>snapshots</code>, can use the Iceberg table name as a namespace.</p>
<p>For example, to read from the <code>files</code> metadata table for <code>prod.db.table</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">files</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>content</th>
<th>file_path</th>
<th>file_format</th>
<th>spec_id</th>
<th>partition</th>
<th>record_count</th>
<th>file_size_in_bytes</th>
<th>column_sizes</th>
<th>value_counts</th>
<th>null_value_counts</th>
<th>nan_value_counts</th>
<th>lower_bounds</th>
<th>upper_bounds</th>
<th>key_metadata</th>
<th>split_offsets</th>
<th>equality_ids</th>
<th>sort_order_id</th>
</tr>
</thead>
<tbody>
<tr>
<td>0</td>
<td>s3:/.../table/data/00000-3-8d6d60e8-d427-4809-bcf0-f5d45a4aad96.parquet</td>
<td>PARQUET</td>
<td>0</td>
<td>{1999-01-01, 01}</td>
<td>1</td>
<td>597</td>
<td>[1 -&gt; 90, 2 -&gt; 62]</td>
<td>[1 -&gt; 1, 2 -&gt; 1]</td>
<td>[1 -&gt; 0, 2 -&gt; 0]</td>
<td>[]</td>
<td>[1 -&gt; , 2 -&gt; c]</td>
<td>[1 -&gt; , 2 -&gt; c]</td>
<td>null</td>
<td>[4]</td>
<td>null</td>
<td>null</td>
</tr>
<tr>
<td>0</td>
<td>s3:/.../table/data/00001-4-8d6d60e8-d427-4809-bcf0-f5d45a4aad96.parquet</td>
<td>PARQUET</td>
<td>0</td>
<td>{1999-01-01, 02}</td>
<td>1</td>
<td>597</td>
<td>[1 -&gt; 90, 2 -&gt; 62]</td>
<td>[1 -&gt; 1, 2 -&gt; 1]</td>
<td>[1 -&gt; 0, 2 -&gt; 0]</td>
<td>[]</td>
<td>[1 -&gt; , 2 -&gt; b]</td>
<td>[1 -&gt; , 2 -&gt; b]</td>
<td>null</td>
<td>[4]</td>
<td>null</td>
<td>null</td>
</tr>
<tr>
<td>0</td>
<td>s3:/.../table/data/00002-5-8d6d60e8-d427-4809-bcf0-f5d45a4aad96.parquet</td>
<td>PARQUET</td>
<td>0</td>
<td>{1999-01-01, 03}</td>
<td>1</td>
<td>597</td>
<td>[1 -&gt; 90, 2 -&gt; 62]</td>
<td>[1 -&gt; 1, 2 -&gt; 1]</td>
<td>[1 -&gt; 0, 2 -&gt; 0]</td>
<td>[]</td>
<td>[1 -&gt; , 2 -&gt; a]</td>
<td>[1 -&gt; , 2 -&gt; a]</td>
<td>null</td>
<td>[4]</td>
<td>null</td>
<td>null</td>
</tr>
</tbody>
</table>
<h2 id="querying-with-dataframes">Querying with DataFrames<a class="headerlink" href="#querying-with-dataframes" title="Permanent link">🔗</a></h2>
<p>To load a table as a DataFrame, use <code>table</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kd">val</span><span class="w"> </span><span class="n">df</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">spark</span><span class="p">.</span><span class="n">table</span><span class="p">(</span><span class="s">&quot;prod.db.table&quot;</span><span class="p">)</span>
</code></pre></div>
<h3 id="catalogs-with-dataframereader">Catalogs with DataFrameReader<a class="headerlink" href="#catalogs-with-dataframereader" title="Permanent link">🔗</a></h3>
<p>Paths and table names can be loaded with Spark's <code>DataFrameReader</code> interface. How tables are loaded depends on how
the identifier is specified. When using <code>spark.read.format("iceberg").load(table)</code> or <code>spark.table(table)</code> the <code>table</code>
variable can take a number of forms as listed below:</p>
<ul>
<li><code>file:///path/to/table</code>: loads a HadoopTable at given path</li>
<li><code>tablename</code>: loads <code>currentCatalog.currentNamespace.tablename</code></li>
<li><code>catalog.tablename</code>: loads <code>tablename</code> from the specified catalog.</li>
<li><code>namespace.tablename</code>: loads <code>namespace.tablename</code> from current catalog</li>
<li><code>catalog.namespace.tablename</code>: loads <code>namespace.tablename</code> from the specified catalog.</li>
<li><code>namespace1.namespace2.tablename</code>: loads <code>namespace1.namespace2.tablename</code> from current catalog</li>
</ul>
<p>The above list is in order of priority. For example: a matching catalog will take priority over any namespace resolution.</p>
<h3 id="time-travel">Time travel<a class="headerlink" href="#time-travel" title="Permanent link">🔗</a></h3>
<h4 id="sql">SQL<a class="headerlink" href="#sql" title="Permanent link">🔗</a></h4>
<p>Spark 3.3 and later supports time travel in SQL queries using <code>TIMESTAMP AS OF</code> or <code>VERSION AS OF</code> clauses.
The <code>VERSION AS OF</code> clause can contain a long snapshot ID or a string branch or tag name.</p>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>Note: If the name of a branch or tag is the same as a snapshot ID, then the snapshot which is selected for time travel is the snapshot
with the given snapshot ID. For example, consider the case where there is a tag named '1' and it references snapshot with ID 2.
If the version travel clause is <code>VERSION AS OF '1'</code>, time travel will be done to the snapshot with ID 1.
If this is not desired, rename the tag or branch with a well-defined prefix such as 'snapshot-1'.</p>
</div>
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="c1">-- time travel to October 26, 1986 at 01:21:00</span>
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="w"> </span><span class="k">TIMESTAMP</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;1986-10-26 01:21:00&#39;</span><span class="p">;</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="c1">-- time travel to snapshot with id 10963874102873L</span>
<a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="w"> </span><span class="k">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">10963874102873</span><span class="p">;</span>
<a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a>
<a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="c1">-- time travel to the head snapshot of audit-branch</span>
<a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></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="n">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="w"> </span><span class="k">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="s1">&#39;audit-branch&#39;</span><span class="p">;</span>
<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="c1">-- time travel to the snapshot referenced by the tag historical-snapshot</span>
<a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></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="n">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="w"> </span><span class="k">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="s1">&#39;historical-snapshot&#39;</span><span class="p">;</span>
</code></pre></div>
<p>In addition, <code>FOR SYSTEM_TIME AS OF</code> and <code>FOR SYSTEM_VERSION AS OF</code> clauses are also supported:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</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;1986-10-26 01:21:00&#39;</span><span class="p">;</span>
<a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</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">10963874102873</span><span class="p">;</span>
<a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></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="n">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</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="s1">&#39;audit-branch&#39;</span><span class="p">;</span>
<a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</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="s1">&#39;historical-snapshot&#39;</span><span class="p">;</span>
</code></pre></div>
<p>Timestamps may also be supplied as a Unix timestamp, in seconds:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="c1">-- timestamp in seconds</span>
<a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="w"> </span><span class="k">TIMESTAMP</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">499162860</span><span class="p">;</span>
<a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></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="n">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</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="mi">499162860</span><span class="p">;</span>
</code></pre></div>
<h4 id="dataframe">DataFrame<a class="headerlink" href="#dataframe" title="Permanent link">🔗</a></h4>
<p>To select a specific table snapshot or the snapshot at some time in the DataFrame API, Iceberg supports four Spark read options:</p>
<ul>
<li><code>snapshot-id</code> selects a specific table snapshot</li>
<li><code>as-of-timestamp</code> selects the current snapshot at a timestamp, in milliseconds</li>
<li><code>branch</code> selects the head snapshot of the specified branch. Note that currently branch cannot be combined with as-of-timestamp.</li>
<li><code>tag</code> selects the snapshot associated with the specified tag. Tags cannot be combined with <code>as-of-timestamp</code>.</li>
</ul>
<div class="highlight"><pre><span></span><code><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="c1">// time travel to October 26, 1986 at 01:21:00</span>
<a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a><span class="n">spark</span><span class="p">.</span><span class="n">read</span>
<a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a><span class="w"> </span><span class="p">.</span><span class="n">option</span><span class="p">(</span><span class="s">&quot;as-of-timestamp&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;499162860000&quot;</span><span class="p">)</span>
<a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a><span class="w"> </span><span class="p">.</span><span class="n">format</span><span class="p">(</span><span class="s">&quot;iceberg&quot;</span><span class="p">)</span>
<a id="__codelineno-6-5" name="__codelineno-6-5" href="#__codelineno-6-5"></a><span class="w"> </span><span class="p">.</span><span class="n">load</span><span class="p">(</span><span class="s">&quot;path/to/table&quot;</span><span class="p">)</span>
</code></pre></div>
<div class="highlight"><pre><span></span><code><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a><span class="c1">// time travel to snapshot with ID 10963874102873L</span>
<a id="__codelineno-7-2" name="__codelineno-7-2" href="#__codelineno-7-2"></a><span class="n">spark</span><span class="p">.</span><span class="n">read</span>
<a id="__codelineno-7-3" name="__codelineno-7-3" href="#__codelineno-7-3"></a><span class="w"> </span><span class="p">.</span><span class="n">option</span><span class="p">(</span><span class="s">&quot;snapshot-id&quot;</span><span class="p">,</span><span class="w"> </span><span class="il">10963874102873L</span><span class="p">)</span>
<a id="__codelineno-7-4" name="__codelineno-7-4" href="#__codelineno-7-4"></a><span class="w"> </span><span class="p">.</span><span class="n">format</span><span class="p">(</span><span class="s">&quot;iceberg&quot;</span><span class="p">)</span>
<a id="__codelineno-7-5" name="__codelineno-7-5" href="#__codelineno-7-5"></a><span class="w"> </span><span class="p">.</span><span class="n">load</span><span class="p">(</span><span class="s">&quot;path/to/table&quot;</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><span class="c1">// time travel to tag historical-snapshot</span>
<a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a><span class="n">spark</span><span class="p">.</span><span class="n">read</span>
<a id="__codelineno-8-3" name="__codelineno-8-3" href="#__codelineno-8-3"></a><span class="w"> </span><span class="p">.</span><span class="n">option</span><span class="p">(</span><span class="nc">SparkReadOptions</span><span class="p">.</span><span class="nc">TAG</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;historical-snapshot&quot;</span><span class="p">)</span>
<a id="__codelineno-8-4" name="__codelineno-8-4" href="#__codelineno-8-4"></a><span class="w"> </span><span class="p">.</span><span class="n">format</span><span class="p">(</span><span class="s">&quot;iceberg&quot;</span><span class="p">)</span>
<a id="__codelineno-8-5" name="__codelineno-8-5" href="#__codelineno-8-5"></a><span class="w"> </span><span class="p">.</span><span class="n">load</span><span class="p">(</span><span class="s">&quot;path/to/table&quot;</span><span class="p">)</span>
</code></pre></div>
<div class="highlight"><pre><span></span><code><a id="__codelineno-9-1" name="__codelineno-9-1" href="#__codelineno-9-1"></a><span class="c1">// time travel to the head snapshot of audit-branch</span>
<a id="__codelineno-9-2" name="__codelineno-9-2" href="#__codelineno-9-2"></a><span class="n">spark</span><span class="p">.</span><span class="n">read</span>
<a id="__codelineno-9-3" name="__codelineno-9-3" href="#__codelineno-9-3"></a><span class="w"> </span><span class="p">.</span><span class="n">option</span><span class="p">(</span><span class="nc">SparkReadOptions</span><span class="p">.</span><span class="nc">BRANCH</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;audit-branch&quot;</span><span class="p">)</span>
<a id="__codelineno-9-4" name="__codelineno-9-4" href="#__codelineno-9-4"></a><span class="w"> </span><span class="p">.</span><span class="n">format</span><span class="p">(</span><span class="s">&quot;iceberg&quot;</span><span class="p">)</span>
<a id="__codelineno-9-5" name="__codelineno-9-5" href="#__codelineno-9-5"></a><span class="w"> </span><span class="p">.</span><span class="n">load</span><span class="p">(</span><span class="s">&quot;path/to/table&quot;</span><span class="p">)</span>
</code></pre></div>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>Spark 3.0 and earlier versions do not support using <code>option</code> with <code>table</code> in DataFrameReader commands. All options will be silently
ignored. Do not use <code>table</code> when attempting to time-travel or use other options. See <a href="https://issues.apache.org/jira/browse/SPARK-32592">SPARK-32592</a>.</p>
</div>
<h3 id="incremental-read">Incremental read<a class="headerlink" href="#incremental-read" title="Permanent link">🔗</a></h3>
<p>To read appended data incrementally, use:</p>
<ul>
<li><code>start-snapshot-id</code> Start snapshot ID used in incremental scans (exclusive).</li>
<li><code>end-snapshot-id</code> End snapshot ID used in incremental scans (inclusive). This is optional. Omitting it will default to the current snapshot.</li>
</ul>
<div class="highlight"><pre><span></span><code><a id="__codelineno-10-1" name="__codelineno-10-1" href="#__codelineno-10-1"></a><span class="c1">// get the data added after start-snapshot-id (10963874102873L) until end-snapshot-id (63874143573109L)</span>
<a id="__codelineno-10-2" name="__codelineno-10-2" href="#__codelineno-10-2"></a><span class="n">spark</span><span class="p">.</span><span class="n">read</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="p">.</span><span class="n">format</span><span class="p">(</span><span class="s">&quot;iceberg&quot;</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="p">.</span><span class="n">option</span><span class="p">(</span><span class="s">&quot;start-snapshot-id&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;10963874102873&quot;</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="p">.</span><span class="n">option</span><span class="p">(</span><span class="s">&quot;end-snapshot-id&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;63874143573109&quot;</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="p">.</span><span class="n">load</span><span class="p">(</span><span class="s">&quot;path/to/table&quot;</span><span class="p">)</span>
</code></pre></div>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>Currently gets only the data from <code>append</code> operation. Cannot support <code>replace</code>, <code>overwrite</code>, <code>delete</code> operations.
Incremental read works with both V1 and V2 format-version.
Incremental read is not supported by Spark's SQL syntax.</p>
</div>
<h2 id="inspecting-tables">Inspecting tables<a class="headerlink" href="#inspecting-tables" title="Permanent link">🔗</a></h2>
<p>To inspect a table's history, snapshots, and other metadata, Iceberg supports metadata tables.</p>
<p>Metadata tables are identified by adding the metadata table name after the original table name. For example, history for <code>db.table</code> is read using <code>db.table.history</code>.</p>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>For Spark 3, prior to 3.2, the Spark <a href="../spark-configuration/#replacing-the-session-catalog">session catalog</a> does not support table names with multipart identifiers such as <code>catalog.database.table.metadata</code>. As a workaround, configure an <code>org.apache.iceberg.spark.SparkCatalog</code>, or use the Spark <code>DataFrameReader</code> API.</p>
</div>
<h3 id="history">History<a class="headerlink" href="#history" title="Permanent link">🔗</a></h3>
<p>To show table history:</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">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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">history</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>made_current_at</th>
<th>snapshot_id</th>
<th>parent_id</th>
<th>is_current_ancestor</th>
</tr>
</thead>
<tbody>
<tr>
<td>2019-02-08 03:29:51.215</td>
<td>5781947118336215154</td>
<td>NULL</td>
<td>true</td>
</tr>
<tr>
<td>2019-02-08 03:47:55.948</td>
<td>5179299526185056830</td>
<td>5781947118336215154</td>
<td>true</td>
</tr>
<tr>
<td>2019-02-09 16:24:30.13</td>
<td>296410040247533544</td>
<td>5179299526185056830</td>
<td>false</td>
</tr>
<tr>
<td>2019-02-09 16:32:47.336</td>
<td>2999875608062437330</td>
<td>5179299526185056830</td>
<td>true</td>
</tr>
<tr>
<td>2019-02-09 19:42:03.919</td>
<td>8924558786060583479</td>
<td>2999875608062437330</td>
<td>true</td>
</tr>
<tr>
<td>2019-02-09 19:49:16.343</td>
<td>6536733823181975045</td>
<td>8924558786060583479</td>
<td>true</td>
</tr>
</tbody>
</table>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p><strong>This shows a commit that was rolled back.</strong> The example has two snapshots with the same parent, and one is <em>not</em> an ancestor of the current table state.</p>
</div>
<h3 id="metadata-log-entries">Metadata Log Entries<a class="headerlink" href="#metadata-log-entries" title="Permanent link">🔗</a></h3>
<p>To show table metadata log entries:</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">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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">metadata_log_entries</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>timestamp</th>
<th>file</th>
<th>latest_snapshot_id</th>
<th>latest_schema_id</th>
<th>latest_sequence_number</th>
</tr>
</thead>
<tbody>
<tr>
<td>2022-07-28 10:43:52.93</td>
<td>s3://.../table/metadata/00000-9441e604-b3c2-498a-a45a-6320e8ab9006.metadata.json</td>
<td>null</td>
<td>null</td>
<td>null</td>
</tr>
<tr>
<td>2022-07-28 10:43:57.487</td>
<td>s3://.../table/metadata/00001-f30823df-b745-4a0a-b293-7532e0c99986.metadata.json</td>
<td>170260833677645300</td>
<td>0</td>
<td>1</td>
</tr>
<tr>
<td>2022-07-28 10:43:58.25</td>
<td>s3://.../table/metadata/00002-2cc2837a-02dc-4687-acc1-b4d86ea486f4.metadata.json</td>
<td>958906493976709774</td>
<td>0</td>
<td>2</td>
</tr>
</tbody>
</table>
<h3 id="snapshots">Snapshots<a class="headerlink" href="#snapshots" title="Permanent link">🔗</a></h3>
<p>To show the valid snapshots for a table:</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">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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">snapshots</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>committed_at</th>
<th>snapshot_id</th>
<th>parent_id</th>
<th>operation</th>
<th>manifest_list</th>
<th>summary</th>
</tr>
</thead>
<tbody>
<tr>
<td>2019-02-08 03:29:51.215</td>
<td>57897183625154</td>
<td>null</td>
<td>append</td>
<td>s3://.../table/metadata/snap-57897183625154-1.avro</td>
<td>{ added-records -&gt; 2478404, total-records -&gt; 2478404, added-data-files -&gt; 438, total-data-files -&gt; 438, spark.app.id -&gt; application_1520379288616_155055 }</td>
</tr>
</tbody>
</table>
<p>You can also join snapshots to table history. For example, this query will show table history, with the application ID that wrote each snapshot:</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">select</span>
<a id="__codelineno-14-2" name="__codelineno-14-2" href="#__codelineno-14-2"></a><span class="w"> </span><span class="n">h</span><span class="p">.</span><span class="n">made_current_at</span><span class="p">,</span>
<a id="__codelineno-14-3" name="__codelineno-14-3" href="#__codelineno-14-3"></a><span class="w"> </span><span class="n">s</span><span class="p">.</span><span class="k">operation</span><span class="p">,</span>
<a id="__codelineno-14-4" name="__codelineno-14-4" href="#__codelineno-14-4"></a><span class="w"> </span><span class="n">h</span><span class="p">.</span><span class="n">snapshot_id</span><span class="p">,</span>
<a id="__codelineno-14-5" name="__codelineno-14-5" href="#__codelineno-14-5"></a><span class="w"> </span><span class="n">h</span><span class="p">.</span><span class="n">is_current_ancestor</span><span class="p">,</span>
<a id="__codelineno-14-6" name="__codelineno-14-6" href="#__codelineno-14-6"></a><span class="w"> </span><span class="n">s</span><span class="p">.</span><span class="n">summary</span><span class="p">[</span><span class="s1">&#39;spark.app.id&#39;</span><span class="p">]</span>
<a id="__codelineno-14-7" name="__codelineno-14-7" href="#__codelineno-14-7"></a><span class="k">from</span><span class="w"> </span><span class="n">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">history</span><span class="w"> </span><span class="n">h</span>
<a id="__codelineno-14-8" name="__codelineno-14-8" href="#__codelineno-14-8"></a><span class="k">join</span><span class="w"> </span><span class="n">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">snapshots</span><span class="w"> </span><span class="n">s</span>
<a id="__codelineno-14-9" name="__codelineno-14-9" href="#__codelineno-14-9"></a><span class="w"> </span><span class="k">on</span><span class="w"> </span><span class="n">h</span><span class="p">.</span><span class="n">snapshot_id</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">s</span><span class="p">.</span><span class="n">snapshot_id</span>
<a id="__codelineno-14-10" name="__codelineno-14-10" href="#__codelineno-14-10"></a><span class="k">order</span><span class="w"> </span><span class="k">by</span><span class="w"> </span><span class="n">made_current_at</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>made_current_at</th>
<th>operation</th>
<th>snapshot_id</th>
<th>is_current_ancestor</th>
<th>summary[spark.app.id]</th>
</tr>
</thead>
<tbody>
<tr>
<td>2019-02-08 03:29:51.215</td>
<td>append</td>
<td>57897183625154</td>
<td>true</td>
<td>application_1520379288616_155055</td>
</tr>
<tr>
<td>2019-02-09 16:24:30.13</td>
<td>delete</td>
<td>29641004024753</td>
<td>false</td>
<td>application_1520379288616_151109</td>
</tr>
<tr>
<td>2019-02-09 16:32:47.336</td>
<td>append</td>
<td>57897183625154</td>
<td>true</td>
<td>application_1520379288616_155055</td>
</tr>
<tr>
<td>2019-02-08 03:47:55.948</td>
<td>overwrite</td>
<td>51792995261850</td>
<td>true</td>
<td>application_1520379288616_152431</td>
</tr>
<tr>
<td>### Entries</td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>To show all the table's current manifest entries for both data and delete files.</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">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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">entries</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>status</th>
<th>snapshot_id</th>
<th>sequence_number</th>
<th>file_sequence_number</th>
<th>data_file</th>
<th>readable_metrics</th>
</tr>
</thead>
<tbody>
<tr>
<td>2</td>
<td>57897183625154</td>
<td>0</td>
<td>0</td>
<td>{"content":0,"file_path":"s3:/.../table/data/00047-25-833044d0-127b-415c-b874-038a4f978c29-00612.parquet","file_format":"PARQUET","spec_id":0,"record_count":15,"file_size_in_bytes":473,"column_sizes":{1:103},"value_counts":{1:15},"null_value_counts":{1:0},"nan_value_counts":{},"lower_bounds":{1:},"upper_bounds":{1:},"key_metadata":null,"split_offsets":[4],"equality_ids":null,"sort_order_id":0}</td>
<td>{"c1":{"column_size":103,"value_count":15,"null_value_count":0,"nan_value_count":null,"lower_bound":1,"upper_bound":3}}</td>
</tr>
</tbody>
</table>
<h3 id="files">Files<a class="headerlink" href="#files" title="Permanent link">🔗</a></h3>
<p>To show a table's current files:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-16-1" name="__codelineno-16-1" href="#__codelineno-16-1"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">files</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>content</th>
<th>file_path</th>
<th>file_format</th>
<th>spec_id</th>
<th>record_count</th>
<th>file_size_in_bytes</th>
<th>column_sizes</th>
<th>value_counts</th>
<th>null_value_counts</th>
<th>nan_value_counts</th>
<th>lower_bounds</th>
<th>upper_bounds</th>
<th>key_metadata</th>
<th>split_offsets</th>
<th>equality_ids</th>
<th>sort_order_id</th>
<th>readable_metrics</th>
</tr>
</thead>
<tbody>
<tr>
<td>0</td>
<td>s3:/.../table/data/00042-3-a9aa8b24-20bc-4d56-93b0-6b7675782bb5-00001.parquet</td>
<td>PARQUET</td>
<td>0</td>
<td>1</td>
<td>652</td>
<td>{1:52,2:48}</td>
<td>{1:1,2:1}</td>
<td>{1:0,2:0}</td>
<td>{}</td>
<td>{1:,2:d}</td>
<td>{1:,2:d}</td>
<td>NULL</td>
<td>[4]</td>
<td>NULL</td>
<td>0</td>
<td>{"data":{"column_size":48,"value_count":1,"null_value_count":0,"nan_value_count":null,"lower_bound":"d","upper_bound":"d"},"id":{"column_size":52,"value_count":1,"null_value_count":0,"nan_value_count":null,"lower_bound":1,"upper_bound":1}}</td>
</tr>
<tr>
<td>0</td>
<td>s3:/.../table/data/00000-0-f9709213-22ca-4196-8733-5cb15d2afeb9-00001.parquet</td>
<td>PARQUET</td>
<td>0</td>
<td>1</td>
<td>643</td>
<td>{1:46,2:48}</td>
<td>{1:1,2:1}</td>
<td>{1:0,2:0}</td>
<td>{}</td>
<td>{1:,2:a}</td>
<td>{1:,2:a}</td>
<td>NULL</td>
<td>[4]</td>
<td>NULL</td>
<td>0</td>
<td>{"data":{"column_size":48,"value_count":1,"null_value_count":0,"nan_value_count":null,"lower_bound":"a","upper_bound":"a"},"id":{"column_size":46,"value_count":1,"null_value_count":0,"nan_value_count":null,"lower_bound":1,"upper_bound":1}}</td>
</tr>
<tr>
<td>0</td>
<td>s3:/.../table/data/00001-1-f9709213-22ca-4196-8733-5cb15d2afeb9-00001.parquet</td>
<td>PARQUET</td>
<td>0</td>
<td>2</td>
<td>644</td>
<td>{1:49,2:51}</td>
<td>{1:2,2:2}</td>
<td>{1:0,2:0}</td>
<td>{}</td>
<td>{1:,2:b}</td>
<td>{1:,2:c}</td>
<td>NULL</td>
<td>[4]</td>
<td>NULL</td>
<td>0</td>
<td>{"data":{"column_size":51,"value_count":2,"null_value_count":0,"nan_value_count":null,"lower_bound":"b","upper_bound":"c"},"id":{"column_size":49,"value_count":2,"null_value_count":0,"nan_value_count":null,"lower_bound":2,"upper_bound":3}}</td>
</tr>
<tr>
<td>1</td>
<td>s3:/.../table/data/00081-4-a9aa8b24-20bc-4d56-93b0-6b7675782bb5-00001-deletes.parquet</td>
<td>PARQUET</td>
<td>0</td>
<td>1</td>
<td>1560</td>
<td>{2147483545:46,2147483546:152}</td>
<td>{2147483545:1,2147483546:1}</td>
<td>{2147483545:0,2147483546:0}</td>
<td>{}</td>
<td>{2147483545:,2147483546:s3:/.../table/data/00000-0-f9709213-22ca-4196-8733-5cb15d2afeb9-00001.parquet}</td>
<td>{2147483545:,2147483546:s3:/.../table/data/00000-0-f9709213-22ca-4196-8733-5cb15d2afeb9-00001.parquet}</td>
<td>NULL</td>
<td>[4]</td>
<td>NULL</td>
<td>NULL</td>
<td>{"data":{"column_size":null,"value_count":null,"null_value_count":null,"nan_value_count":null,"lower_bound":null,"upper_bound":null},"id":{"column_size":null,"value_count":null,"null_value_count":null,"nan_value_count":null,"lower_bound":null,"upper_bound":null}}</td>
</tr>
<tr>
<td>2</td>
<td>s3:/.../table/data/00047-25-833044d0-127b-415c-b874-038a4f978c29-00612.parquet</td>
<td>PARQUET</td>
<td>0</td>
<td>126506</td>
<td>28613985</td>
<td>{100:135377,101:11314}</td>
<td>{100:126506,101:126506}</td>
<td>{100:105434,101:11}</td>
<td>{}</td>
<td>{100:0,101:17}</td>
<td>{100:404455227527,101:23}</td>
<td>NULL</td>
<td>NULL</td>
<td>[1]</td>
<td>0</td>
<td>{"id":{"column_size":135377,"value_count":126506,"null_value_count":105434,"nan_value_count":null,"lower_bound":0,"upper_bound":404455227527},"data":{"column_size":11314,"value_count":126506,"null_value_count": 11,"nan_value_count":null,"lower_bound":17,"upper_bound":23}}</td>
</tr>
</tbody>
</table>
<div class="admonition info">
<p class="admonition-title">Info</p>
</div>
<p>Content refers to type of content stored by the data file:
0 Data
1 Position Deletes
2 Equality Deletes</p>
<p>To show only data files or delete files, query <code>prod.db.table.data_files</code> and <code>prod.db.table.delete_files</code> respectively.
To show all files, data files and delete files across all tracked snapshots, query <code>prod.db.table.all_files</code>, <code>prod.db.table.all_data_files</code> and <code>prod.db.table.all_delete_files</code> respectively.</p>
<h3 id="manifests">Manifests<a class="headerlink" href="#manifests" title="Permanent link">🔗</a></h3>
<p>To show a table's current file manifests:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-17-1" name="__codelineno-17-1" href="#__codelineno-17-1"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">manifests</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>path</th>
<th>length</th>
<th>partition_spec_id</th>
<th>added_snapshot_id</th>
<th>added_data_files_count</th>
<th>existing_data_files_count</th>
<th>deleted_data_files_count</th>
<th>partition_summaries</th>
</tr>
</thead>
<tbody>
<tr>
<td>s3://.../table/metadata/45b5290b-ee61-4788-b324-b1e2735c0e10-m0.avro</td>
<td>4479</td>
<td>0</td>
<td>6668963634911763636</td>
<td>8</td>
<td>0</td>
<td>0</td>
<td>[[false,null,2019-05-13,2019-05-15]]</td>
</tr>
</tbody>
</table>
<p>Note:
1. Fields within <code>partition_summaries</code> column of the manifests table correspond to <code>field_summary</code> structs within <a href="../../spec.md#manifest-lists">manifest list</a>, with the following order:
- <code>contains_null</code>
- <code>contains_nan</code>
- <code>lower_bound</code>
- <code>upper_bound</code>
2. <code>contains_nan</code> could return null, which indicates that this information is not available from the file's metadata.
This usually occurs when reading from V1 table, where <code>contains_nan</code> is not populated.</p>
<h3 id="partitions">Partitions<a class="headerlink" href="#partitions" title="Permanent link">🔗</a></h3>
<p>To show a table's current partitions:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-18-1" name="__codelineno-18-1" href="#__codelineno-18-1"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">partitions</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>partition</th>
<th>spec_id</th>
<th>record_count</th>
<th>file_count</th>
<th>total_data_file_size_in_bytes</th>
<th>position_delete_record_count</th>
<th>position_delete_file_count</th>
<th>equality_delete_record_count</th>
<th>equality_delete_file_count</th>
<th>last_updated_at(μs)</th>
<th>last_updated_snapshot_id</th>
</tr>
</thead>
<tbody>
<tr>
<td>{20211001, 11}</td>
<td>0</td>
<td>1</td>
<td>1</td>
<td>100</td>
<td>2</td>
<td>1</td>
<td>0</td>
<td>0</td>
<td>1633086034192000</td>
<td>9205185327307503337</td>
</tr>
<tr>
<td>{20211002, 11}</td>
<td>0</td>
<td>4</td>
<td>3</td>
<td>500</td>
<td>1</td>
<td>1</td>
<td>0</td>
<td>0</td>
<td>1633172537358000</td>
<td>867027598972211003</td>
</tr>
<tr>
<td>{20211001, 10}</td>
<td>0</td>
<td>7</td>
<td>4</td>
<td>700</td>
<td>0</td>
<td>0</td>
<td>0</td>
<td>0</td>
<td>1633082598716000</td>
<td>3280122546965981531</td>
</tr>
<tr>
<td>{20211002, 10}</td>
<td>0</td>
<td>3</td>
<td>2</td>
<td>400</td>
<td>0</td>
<td>0</td>
<td>1</td>
<td>1</td>
<td>1633169159489000</td>
<td>6941468797545315876</td>
</tr>
</tbody>
</table>
<p>Note:
1. For unpartitioned tables, the partitions table will not contain the partition and spec_id fields.</p>
<ol>
<li>The partitions metadata table shows partitions with data files or delete files in the current snapshot. However, delete files are not applied, and so in some cases partitions may be shown even though all their data rows are marked deleted by delete files.</li>
</ol>
<h3 id="positional-delete-files">Positional Delete Files<a class="headerlink" href="#positional-delete-files" title="Permanent link">🔗</a></h3>
<p>To show all positional delete files from the current snapshot of 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="n">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">position_deletes</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>file_path</th>
<th>pos</th>
<th>row</th>
<th>spec_id</th>
<th>delete_file_path</th>
</tr>
</thead>
<tbody>
<tr>
<td>s3:/.../table/data/00042-3-a9aa8b24-20bc-4d56-93b0-6b7675782bb5-00001.parquet</td>
<td>1</td>
<td>0</td>
<td>0</td>
<td>s3:/.../table/data/00191-1933-25e9f2f3-d863-4a69-a5e1-f9aeeebe60bb-00001-deletes.parquet</td>
</tr>
</tbody>
</table>
<h3 id="all-metadata-tables">All Metadata Tables<a class="headerlink" href="#all-metadata-tables" title="Permanent link">🔗</a></h3>
<p>These tables are unions of the metadata tables specific to the current snapshot, and return metadata across all snapshots.</p>
<div class="admonition danger">
<p class="admonition-title">Danger</p>
<p>The "all" metadata tables may produce more than one row per data file or manifest file because metadata files may be part of more than one table snapshot.</p>
</div>
<h4 id="all-data-files">All Data Files<a class="headerlink" href="#all-data-files" title="Permanent link">🔗</a></h4>
<p>To show all of the table's data files and each file's metadata:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-20-1" name="__codelineno-20-1" href="#__codelineno-20-1"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">all_data_files</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>content</th>
<th>file_path</th>
<th>file_format</th>
<th>partition</th>
<th>record_count</th>
<th>file_size_in_bytes</th>
<th>column_sizes</th>
<th>value_counts</th>
<th>null_value_counts</th>
<th>nan_value_counts</th>
<th>lower_bounds</th>
<th>upper_bounds</th>
<th>key_metadata</th>
<th>split_offsets</th>
<th>equality_ids</th>
<th>sort_order_id</th>
</tr>
</thead>
<tbody>
<tr>
<td>0</td>
<td>s3://.../dt=20210102/00000-0-756e2512-49ae-45bb-aae3-c0ca475e7879-00001.parquet</td>
<td>PARQUET</td>
<td>{20210102}</td>
<td>14</td>
<td>2444</td>
<td>{1 -&gt; 94, 2 -&gt; 17}</td>
<td>{1 -&gt; 14, 2 -&gt; 14}</td>
<td>{1 -&gt; 0, 2 -&gt; 0}</td>
<td>{}</td>
<td>{1 -&gt; 1, 2 -&gt; 20210102}</td>
<td>{1 -&gt; 2, 2 -&gt; 20210102}</td>
<td>null</td>
<td>[4]</td>
<td>null</td>
<td>0</td>
</tr>
<tr>
<td>0</td>
<td>s3://.../dt=20210103/00000-0-26222098-032f-472b-8ea5-651a55b21210-00001.parquet</td>
<td>PARQUET</td>
<td>{20210103}</td>
<td>14</td>
<td>2444</td>
<td>{1 -&gt; 94, 2 -&gt; 17}</td>
<td>{1 -&gt; 14, 2 -&gt; 14}</td>
<td>{1 -&gt; 0, 2 -&gt; 0}</td>
<td>{}</td>
<td>{1 -&gt; 1, 2 -&gt; 20210103}</td>
<td>{1 -&gt; 3, 2 -&gt; 20210103}</td>
<td>null</td>
<td>[4]</td>
<td>null</td>
<td>0</td>
</tr>
<tr>
<td>0</td>
<td>s3://.../dt=20210104/00000-0-a3bb1927-88eb-4f1c-bc6e-19076b0d952e-00001.parquet</td>
<td>PARQUET</td>
<td>{20210104}</td>
<td>14</td>
<td>2444</td>
<td>{1 -&gt; 94, 2 -&gt; 17}</td>
<td>{1 -&gt; 14, 2 -&gt; 14}</td>
<td>{1 -&gt; 0, 2 -&gt; 0}</td>
<td>{}</td>
<td>{1 -&gt; 1, 2 -&gt; 20210104}</td>
<td>{1 -&gt; 3, 2 -&gt; 20210104}</td>
<td>null</td>
<td>[4]</td>
<td>null</td>
<td>0</td>
</tr>
</tbody>
</table>
<h4 id="all-delete-files">All Delete Files<a class="headerlink" href="#all-delete-files" title="Permanent link">🔗</a></h4>
<p>To show the table's delete files and each file's metadata from all the snapshots:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-21-1" name="__codelineno-21-1" href="#__codelineno-21-1"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">all_delete_files</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>content</th>
<th>file_path</th>
<th>file_format</th>
<th>spec_id</th>
<th>record_count</th>
<th>file_size_in_bytes</th>
<th>column_sizes</th>
<th>value_counts</th>
<th>null_value_counts</th>
<th>nan_value_counts</th>
<th>lower_bounds</th>
<th>upper_bounds</th>
<th>key_metadata</th>
<th>split_offsets</th>
<th>equality_ids</th>
<th>sort_order_id</th>
<th>readable_metrics</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>s3:/.../table/data/00081-4-a9aa8b24-20bc-4d56-93b0-6b7675782bb5-00001-deletes.parquet</td>
<td>PARQUET</td>
<td>0</td>
<td>1</td>
<td>1560</td>
<td>{2147483545:46,2147483546:152}</td>
<td>{2147483545:1,2147483546:1}</td>
<td>{2147483545:0,2147483546:0}</td>
<td>{}</td>
<td>{2147483545:,2147483546:s3:/.../table/data/00000-0-f9709213-22ca-4196-8733-5cb15d2afeb9-00001.parquet}</td>
<td>{2147483545:,2147483546:s3:/.../table/data/00000-0-f9709213-22ca-4196-8733-5cb15d2afeb9-00001.parquet}</td>
<td>NULL</td>
<td>[4]</td>
<td>NULL</td>
<td>NULL</td>
<td>{"data":{"column_size":null,"value_count":null,"null_value_count":null,"nan_value_count":null,"lower_bound":null,"upper_bound":null},"id":{"column_size":null,"value_count":null,"null_value_count":null,"nan_value_count":null,"lower_bound":null,"upper_bound":null}}</td>
</tr>
<tr>
<td>2</td>
<td>s3:/.../table/data/00047-25-833044d0-127b-415c-b874-038a4f978c29-00612.parquet</td>
<td>PARQUET</td>
<td>0</td>
<td>126506</td>
<td>28613985</td>
<td>{100:135377,101:11314}</td>
<td>{100:126506,101:126506}</td>
<td>{100:105434,101:11}</td>
<td>{}</td>
<td>{100:0,101:17}</td>
<td>{100:404455227527,101:23}</td>
<td>NULL</td>
<td>NULL</td>
<td>[1]</td>
<td>0</td>
<td>{"id":{"column_size":135377,"value_count":126506,"null_value_count":105434,"nan_value_count":null,"lower_bound":0,"upper_bound":404455227527},"data":{"column_size":11314,"value_count":126506,"null_value_count": 11,"nan_value_count":null,"lower_bound":17,"upper_bound":23}}</td>
</tr>
</tbody>
</table>
<h4 id="all-entries">All Entries<a class="headerlink" href="#all-entries" title="Permanent link">🔗</a></h4>
<p>To show the table's manifest entries from all the snapshots for both data and delete files:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-22-1" name="__codelineno-22-1" href="#__codelineno-22-1"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">all_entries</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>status</th>
<th>snapshot_id</th>
<th>sequence_number</th>
<th>file_sequence_number</th>
<th>data_file</th>
<th>readable_metrics</th>
</tr>
</thead>
<tbody>
<tr>
<td>2</td>
<td>57897183625154</td>
<td>0</td>
<td>0</td>
<td>{"content":0,"file_path":"s3:/.../table/data/00047-25-833044d0-127b-415c-b874-038a4f978c29-00612.parquet","file_format":"PARQUET","spec_id":0,"record_count":15,"file_size_in_bytes":473,"column_sizes":{1:103},"value_counts":{1:15},"null_value_counts":{1:0},"nan_value_counts":{},"lower_bounds":{1:},"upper_bounds":{1:},"key_metadata":null,"split_offsets":[4],"equality_ids":null,"sort_order_id":0}</td>
<td>{"c1":{"column_size":103,"value_count":15,"null_value_count":0,"nan_value_count":null,"lower_bound":1,"upper_bound":3}}</td>
</tr>
<tr>
<td>#### All Manifests</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>To show all of the table's manifest files:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-23-1" name="__codelineno-23-1" href="#__codelineno-23-1"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">all_manifests</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>path</th>
<th>length</th>
<th>partition_spec_id</th>
<th>added_snapshot_id</th>
<th>added_data_files_count</th>
<th>existing_data_files_count</th>
<th>deleted_data_files_count</th>
<th>partition_summaries</th>
</tr>
</thead>
<tbody>
<tr>
<td>s3://.../metadata/a85f78c5-3222-4b37-b7e4-faf944425d48-m0.avro</td>
<td>6376</td>
<td>0</td>
<td>6272782676904868561</td>
<td>2</td>
<td>0</td>
<td>0</td>
<td>[{false, false, 20210101, 20210101}]</td>
</tr>
</tbody>
</table>
<p>Note:
1. Fields within <code>partition_summaries</code> column of the manifests table correspond to <code>field_summary</code> structs within <a href="../../spec.md#manifest-lists">manifest list</a>, with the following order:
- <code>contains_null</code>
- <code>contains_nan</code>
- <code>lower_bound</code>
- <code>upper_bound</code>
2. <code>contains_nan</code> could return null, which indicates that this information is not available from the file's metadata.
This usually occurs when reading from V1 table, where <code>contains_nan</code> is not populated.</p>
<h3 id="references">References<a class="headerlink" href="#references" title="Permanent link">🔗</a></h3>
<p>To show a table's known snapshot references:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-24-1" name="__codelineno-24-1" href="#__codelineno-24-1"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">refs</span><span class="p">;</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>name</th>
<th>type</th>
<th>snapshot_id</th>
<th>max_reference_age_in_ms</th>
<th>min_snapshots_to_keep</th>
<th>max_snapshot_age_in_ms</th>
</tr>
</thead>
<tbody>
<tr>
<td>main</td>
<td>BRANCH</td>
<td>4686954189838128572</td>
<td>10</td>
<td>20</td>
<td>30</td>
</tr>
<tr>
<td>testTag</td>
<td>TAG</td>
<td>4686954189838128572</td>
<td>10</td>
<td>null</td>
<td>null</td>
</tr>
</tbody>
</table>
<h3 id="inspecting-with-dataframes">Inspecting with DataFrames<a class="headerlink" href="#inspecting-with-dataframes" title="Permanent link">🔗</a></h3>
<p>Metadata tables can be loaded using the DataFrameReader API:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-25-1" name="__codelineno-25-1" href="#__codelineno-25-1"></a><span class="c1">// named metastore table</span>
<a id="__codelineno-25-2" name="__codelineno-25-2" href="#__codelineno-25-2"></a><span class="n">spark</span><span class="p">.</span><span class="n">read</span><span class="p">.</span><span class="n">format</span><span class="p">(</span><span class="s">&quot;iceberg&quot;</span><span class="p">).</span><span class="n">load</span><span class="p">(</span><span class="s">&quot;db.table.files&quot;</span><span class="p">)</span>
<a id="__codelineno-25-3" name="__codelineno-25-3" href="#__codelineno-25-3"></a><span class="c1">// Hadoop path table</span>
<a id="__codelineno-25-4" name="__codelineno-25-4" href="#__codelineno-25-4"></a><span class="n">spark</span><span class="p">.</span><span class="n">read</span><span class="p">.</span><span class="n">format</span><span class="p">(</span><span class="s">&quot;iceberg&quot;</span><span class="p">).</span><span class="n">load</span><span class="p">(</span><span class="s">&quot;hdfs://nn:8020/path/to/table#files&quot;</span><span class="p">)</span>
</code></pre></div>
<h3 id="time-travel-with-metadata-tables">Time Travel with Metadata Tables<a class="headerlink" href="#time-travel-with-metadata-tables" title="Permanent link">🔗</a></h3>
<p>To inspect a tables's metadata with the time travel feature:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-26-1" name="__codelineno-26-1" href="#__codelineno-26-1"></a><span class="c1">-- get the table&#39;s file manifests at timestamp Sep 20, 2021 08:00:00</span>
<a id="__codelineno-26-2" name="__codelineno-26-2" href="#__codelineno-26-2"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">manifests</span><span class="w"> </span><span class="k">TIMESTAMP</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;2021-09-20 08:00:00&#39;</span><span class="p">;</span>
<a id="__codelineno-26-3" name="__codelineno-26-3" href="#__codelineno-26-3"></a>
<a id="__codelineno-26-4" name="__codelineno-26-4" href="#__codelineno-26-4"></a><span class="c1">-- get the table&#39;s partitions with snapshot id 10963874102873L</span>
<a id="__codelineno-26-5" name="__codelineno-26-5" href="#__codelineno-26-5"></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">prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">.</span><span class="n">partitions</span><span class="w"> </span><span class="k">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">10963874102873</span><span class="p">;</span>
</code></pre></div>
<p>Metadata tables can also be inspected with time travel using the DataFrameReader API:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-27-1" name="__codelineno-27-1" href="#__codelineno-27-1"></a><span class="c1">// load the table&#39;s file metadata at snapshot-id 10963874102873 as DataFrame</span>
<a id="__codelineno-27-2" name="__codelineno-27-2" href="#__codelineno-27-2"></a><span class="n">spark</span><span class="p">.</span><span class="n">read</span><span class="p">.</span><span class="n">format</span><span class="p">(</span><span class="s">&quot;iceberg&quot;</span><span class="p">).</span><span class="n">option</span><span class="p">(</span><span class="s">&quot;snapshot-id&quot;</span><span class="p">,</span><span class="w"> </span><span class="il">10963874102873L</span><span class="p">).</span><span class="n">load</span><span class="p">(</span><span class="s">&quot;db.table.files&quot;</span><span class="p">)</span>
</code></pre></div>
</article>
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