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From jihoon...@apache.org
Subject svn commit: r1710773 [36/39] - in /tajo/site/docs: 0.11.0/ 0.11.0/_sources/ 0.11.0/_sources/backup_and_restore/ 0.11.0/_sources/configuration/ 0.11.0/_sources/functions/ 0.11.0/_sources/getting_started/ 0.11.0/_sources/index/ 0.11.0/_sources/partitioni...
Date Tue, 27 Oct 2015 11:04:36 GMT
Added: tajo/site/docs/current/functions/agg_func.html
URL: http://svn.apache.org/viewvc/tajo/site/docs/current/functions/agg_func.html?rev=1710773&view=auto
==============================================================================
--- tajo/site/docs/current/functions/agg_func.html (added)
+++ tajo/site/docs/current/functions/agg_func.html Tue Oct 27 11:04:33 2015
@@ -0,0 +1,458 @@
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+    <li>Aggregation Functions</li>
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+          <a href="../_sources/functions/agg_func.txt" rel="nofollow"> View page source</a>
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+      </li>
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+          <div role="main">
+            
+  <div class="section" id="aggregation-functions">
+<h1>Aggregation Functions<a class="headerlink" href="#aggregation-functions" title="Permalink to this headline">¶</a></h1>
+<dl class="function">
+<dt id="avg">
+<code class="descname">avg</code><span class="sig-paren">(</span><em>expression</em><span class="sig-paren">)</span><a class="headerlink" href="#avg" title="Permalink to this definition">¶</a></dt>
+<dd><p>Returns the average of all input values.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>expression</strong> (<em>int | float</em>) &#8211; </td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td>
+</tr>
+</tbody>
+</table>
+</dd></dl>
+
+<dl class="function">
+<dt id="corr">
+<code class="descname">corr</code><span class="sig-paren">(</span><em>expression1</em>, <em>expression2</em><span class="sig-paren">)</span><a class="headerlink" href="#corr" title="Permalink to this definition">¶</a></dt>
+<dd><p>Returns the coefficient of correlation between a set of number pairs.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>expression1</strong> (<em>int | float</em>) &#8211; </li>
+<li><strong>expression2</strong> (<em>int | float</em>) &#8211; </li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">float8</p>
+</td>
+</tr>
+</tbody>
+</table>
+</dd></dl>
+
+<dl class="function">
+<dt id="count">
+<code class="descname">count</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#count" title="Permalink to this definition">¶</a></dt>
+<dd><p>Returns the number of input rows.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">int8</td>
+</tr>
+</tbody>
+</table>
+</dd></dl>
+
+<dl class="function">
+<dt id="last_value">
+<code class="descname">last_value</code><span class="sig-paren">(</span><em>expression</em><span class="sig-paren">)</span><a class="headerlink" href="#last_value" title="Permalink to this definition">¶</a></dt>
+<dd><p>Returns the last value of expression.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>expression</strong> (<em>int | float | date | time | timestamp | text</em>) &#8211; </td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">same as parameter data type</td>
+</tr>
+</tbody>
+</table>
+</dd></dl>
+
+<dl class="function">
+<dt id="max">
+<code class="descname">max</code><span class="sig-paren">(</span><em>expression</em><span class="sig-paren">)</span><a class="headerlink" href="#max" title="Permalink to this definition">¶</a></dt>
+<dd><p>Returns the maximum value of expression.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>expression</strong> (<em>int | float | date | time | timestamp | text</em>) &#8211; </td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">same as parameter data type</td>
+</tr>
+</tbody>
+</table>
+</dd></dl>
+
+<dl class="function">
+<dt id="min">
+<code class="descname">min</code><span class="sig-paren">(</span><em>expression</em><span class="sig-paren">)</span><a class="headerlink" href="#min" title="Permalink to this definition">¶</a></dt>
+<dd><p>Returns the minimum value of expression.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>expression</strong> (<em>int | float | date | time | timestamp | text</em>) &#8211; </td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">same as parameter data type</td>
+</tr>
+</tbody>
+</table>
+</dd></dl>
+
+<dl class="function">
+<dt id="stddev_pop">
+<code class="descname">stddev_pop</code><span class="sig-paren">(</span><em>expression</em><span class="sig-paren">)</span><a class="headerlink" href="#stddev_pop" title="Permalink to this definition">¶</a></dt>
+<dd><p>Returns the population standard deviation of a set of numbers.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>expression</strong> (<em>int | float</em>) &#8211; </td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td>
+</tr>
+</tbody>
+</table>
+</dd></dl>
+
+<dl class="function">
+<dt id="stddev_samp">
+<code class="descname">stddev_samp</code><span class="sig-paren">(</span><em>expression</em><span class="sig-paren">)</span><a class="headerlink" href="#stddev_samp" title="Permalink to this definition">¶</a></dt>
+<dd><p>Returns the sample standard deviation of a set of numbers.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>expression</strong> (<em>int | float</em>) &#8211; </td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td>
+</tr>
+</tbody>
+</table>
+</dd></dl>
+
+<dl class="function">
+<dt id="sum">
+<code class="descname">sum</code><span class="sig-paren">(</span><em>expression</em><span class="sig-paren">)</span><a class="headerlink" href="#sum" title="Permalink to this definition">¶</a></dt>
+<dd><p>Returns the sum of a set of numbers.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>expression</strong> (<em>int | float</em>) &#8211; </td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">same as parameter data type</td>
+</tr>
+</tbody>
+</table>
+</dd></dl>
+
+<dl class="function">
+<dt id="var_pop">
+<code class="descname">var_pop</code><span class="sig-paren">(</span><em>expression</em><span class="sig-paren">)</span><a class="headerlink" href="#var_pop" title="Permalink to this definition">¶</a></dt>
+<dd><p>Returns the variance of a set of numbers.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>expression</strong> (<em>int | float</em>) &#8211; </td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td>
+</tr>
+</tbody>
+</table>
+</dd></dl>
+
+<dl class="function">
+<dt id="var_samp">
+<code class="descname">var_samp</code><span class="sig-paren">(</span><em>expression</em><span class="sig-paren">)</span><a class="headerlink" href="#var_samp" title="Permalink to this definition">¶</a></dt>
+<dd><p>Returns the unbiased sample variance of a set of numbers.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>expression</strong> (<em>int | float</em>) &#8211; </td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td>
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+            
+  <div class="section" id="data-type-functions-and-operators">
+<h1>Data Type Functions and Operators<a class="headerlink" href="#data-type-functions-and-operators" title="Permalink to this headline">¶</a></h1>
+<dl class="function">
+<dt id="to_bin">
+<code class="descname">to_bin</code><span class="sig-paren">(</span><em>source int4</em><span class="sig-paren">)</span><a class="headerlink" href="#to_bin" title="Permalink to this definition">¶</a></dt>
+<dd><p>Returns the binary representation of integer.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>source</strong> &#8211; source value</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">text</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td>
+</tr>
+</tbody>
+</table>
+<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">to_bin</span><span class="p">(</span><span class="mi">22</span><span class="p">);</span>
+<span class="o">&gt;</span> <span class="mi">10110</span>
+</pre></div>
+</div>
+</dd></dl>
+
+<dl class="function">
+<dt id="to_char">
+<code class="descname">to_char</code><span class="sig-paren">(</span><em>source int8</em>, <em>format text</em><span class="sig-paren">)</span><a class="headerlink" href="#to_char" title="Permalink to this definition">¶</a></dt>
+<dd><p>Convert integer to string.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>source</strong> &#8211; source value</li>
+<li><strong>format</strong> &#8211; format</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">text</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td>
+</tr>
+</tbody>
+</table>
+<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">to_char</span><span class="p">(</span><span class="mi">125</span><span class="p">,</span> <span class="s1">&#39;00999&#39;</span><span class="p">);</span>
+<span class="o">&gt;</span> <span class="mi">00125</span>
+</pre></div>
+</div>
+</dd></dl>
+
+<dl class="function">
+<dt id="to_hex">
+<code class="descname">to_hex</code><span class="sig-paren">(</span><em>source int4</em><span class="sig-paren">)</span><a class="headerlink" href="#to_hex" title="Permalink to this definition">¶</a></dt>
+<dd><p>Convert the argument to hexadecimal.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>source</strong> &#8211; source value</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">text</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td>
+</tr>
+</tbody>
+</table>
+<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">to_hex</span><span class="p">(</span><span class="mi">15</span><span class="p">);</span>
+<span class="o">&gt;</span> <span class="n">F</span>
+</pre></div>
+</div>
+</dd></dl>
+
+</div>
+
+
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+  <div class="section" id="python-functions">
+<h1>Python Functions<a class="headerlink" href="#python-functions" title="Permalink to this headline">¶</a></h1>
+<div class="section" id="user-defined-functions">
+<h2>User-defined Functions<a class="headerlink" href="#user-defined-functions" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="function-registration">
+<h3>Function registration<a class="headerlink" href="#function-registration" title="Permalink to this headline">¶</a></h3>
+<p>To register Python UDFs, you must install script files in all cluster nodes.
+After that, you can register your functions by specifying the paths to those script files in <code class="docutils literal"><span class="pre">tajo-site.xml</span></code>. Here is an example of the configuration.</p>
+<div class="highlight-xml"><div class="highlight"><pre><span class="nt">&lt;property&gt;</span>
+  <span class="nt">&lt;name&gt;</span>tajo.function.python.code-dir<span class="nt">&lt;/name&gt;</span>
+  <span class="nt">&lt;value&gt;</span>/path/to/script1.py,/path/to/script2.py<span class="nt">&lt;/value&gt;</span>
+<span class="nt">&lt;/property&gt;</span>
+</pre></div>
+</div>
+<p>Please note that you can specify multiple paths with <code class="docutils literal"><span class="pre">','</span></code> as a delimiter. Each file can contain multiple functions. Here is a typical example of a script file.</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="c"># /path/to/udf1.py</span>
+
+<span class="nd">@output_type</span><span class="p">(</span><span class="s">&#39;int4&#39;</span><span class="p">)</span>
+<span class="k">def</span> <span class="nf">return_one</span><span class="p">():</span>
+  <span class="k">return</span> <span class="mi">1</span>
+
+<span class="nd">@output_type</span><span class="p">(</span><span class="s">&quot;text&quot;</span><span class="p">)</span>
+<span class="k">def</span> <span class="nf">helloworld</span><span class="p">():</span>
+  <span class="k">return</span> <span class="s">&#39;Hello, World&#39;</span>
+
+<span class="c"># No decorator - blob</span>
+<span class="k">def</span> <span class="nf">concat_py</span><span class="p">(</span><span class="nb">str</span><span class="p">):</span>
+  <span class="k">return</span> <span class="nb">str</span><span class="o">+</span><span class="nb">str</span>
+
+<span class="nd">@output_type</span><span class="p">(</span><span class="s">&#39;int4&#39;</span><span class="p">)</span>
+<span class="k">def</span> <span class="nf">sum_py</span><span class="p">(</span><span class="n">a</span><span class="p">,</span><span class="n">b</span><span class="p">):</span>
+  <span class="k">return</span> <span class="n">a</span><span class="o">+</span><span class="n">b</span>
+</pre></div>
+</div>
+<p>If the configuration is set properly, every function in the script files are registered when the Tajo cluster starts up.</p>
+</div>
+<div class="section" id="decorators-and-types">
+<h3>Decorators and types<a class="headerlink" href="#decorators-and-types" title="Permalink to this headline">¶</a></h3>
+<p>By default, every function has a return type of <code class="docutils literal"><span class="pre">BLOB</span></code>.
+You can use Python decorators to define output types for the script functions. Tajo can figure out return types from the annotations of the Python script.</p>
+<ul class="simple">
+<li><code class="docutils literal"><span class="pre">output_type</span></code>: Defines the return data type for a script UDF in a format that Tajo can understand. The defined type must be one of the types supported by Tajo. For supported types, please refer to <a class="reference internal" href="../sql_language/data_model.html"><em>Data Model</em></a>.</li>
+</ul>
+</div>
+<div class="section" id="query-example">
+<h3>Query example<a class="headerlink" href="#query-example" title="Permalink to this headline">¶</a></h3>
+<p>Once the Python UDFs are successfully registered, you can use them as other built-in functions.</p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="k">default</span><span class="o">&gt;</span> <span class="k">select</span> <span class="n">concat_py</span><span class="p">(</span><span class="n">n_name</span><span class="p">)::</span><span class="nb">text</span> <span class="k">from</span> <span class="n">nation</span> <span class="k">where</span> <span class="n">sum_py</span><span class="p">(</span><span class="n">n_regionkey</span><span class="p">,</span><span class="mi">1</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">2</span><span class="p">;</span>
+</pre></div>
+</div>
+</div>
+</div>
+<div class="section" id="user-defined-aggregation-functions">
+<h2>User-defined Aggregation Functions<a class="headerlink" href="#user-defined-aggregation-functions" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id1">
+<h3>Function registration<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h3>
+<p>To define your Python aggregation functions, you should write Python classes for each function.
+Followings are typical examples of Python UDAFs.</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="c"># /path/to/udaf1.py</span>
+
+<span class="k">class</span> <span class="nc">AvgPy</span><span class="p">:</span>
+  <span class="nb">sum</span> <span class="o">=</span> <span class="mi">0</span>
+  <span class="n">cnt</span> <span class="o">=</span> <span class="mi">0</span>
+
+  <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+      <span class="bp">self</span><span class="o">.</span><span class="n">reset</span><span class="p">()</span>
+
+  <span class="k">def</span> <span class="nf">reset</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+      <span class="bp">self</span><span class="o">.</span><span class="n">sum</span> <span class="o">=</span> <span class="mi">0</span>
+      <span class="bp">self</span><span class="o">.</span><span class="n">cnt</span> <span class="o">=</span> <span class="mi">0</span>
+
+  <span class="c"># eval at the first stage</span>
+  <span class="k">def</span> <span class="nf">eval</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">item</span><span class="p">):</span>
+      <span class="bp">self</span><span class="o">.</span><span class="n">sum</span> <span class="o">+=</span> <span class="n">item</span>
+      <span class="bp">self</span><span class="o">.</span><span class="n">cnt</span> <span class="o">+=</span> <span class="mi">1</span>
+
+  <span class="c"># get intermediate result</span>
+  <span class="k">def</span> <span class="nf">get_partial_result</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+      <span class="k">return</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">sum</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">cnt</span><span class="p">]</span>
+
+  <span class="c"># merge intermediate results</span>
+  <span class="k">def</span> <span class="nf">merge</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="nb">list</span><span class="p">):</span>
+      <span class="bp">self</span><span class="o">.</span><span class="n">sum</span> <span class="o">+=</span> <span class="nb">list</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
+      <span class="bp">self</span><span class="o">.</span><span class="n">cnt</span> <span class="o">+=</span> <span class="nb">list</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
+
+  <span class="c"># get final result</span>
+  <span class="nd">@output_type</span><span class="p">(</span><span class="s">&#39;float8&#39;</span><span class="p">)</span>
+  <span class="k">def</span> <span class="nf">get_final_result</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+      <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">sum</span> <span class="o">/</span> <span class="nb">float</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">cnt</span><span class="p">)</span>
+
+
+<span class="k">class</span> <span class="nc">CountPy</span><span class="p">:</span>
+  <span class="n">cnt</span> <span class="o">=</span> <span class="mi">0</span>
+
+  <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+      <span class="bp">self</span><span class="o">.</span><span class="n">reset</span><span class="p">()</span>
+
+  <span class="k">def</span> <span class="nf">reset</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+      <span class="bp">self</span><span class="o">.</span><span class="n">cnt</span> <span class="o">=</span> <span class="mi">0</span>
+
+  <span class="c"># eval at the first stage</span>
+  <span class="k">def</span> <span class="nf">eval</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+      <span class="bp">self</span><span class="o">.</span><span class="n">cnt</span> <span class="o">+=</span> <span class="mi">1</span>
+
+  <span class="c"># get intermediate result</span>
+  <span class="k">def</span> <span class="nf">get_partial_result</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+      <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">cnt</span>
+
+  <span class="c"># merge intermediate results</span>
+  <span class="k">def</span> <span class="nf">merge</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">cnt</span><span class="p">):</span>
+      <span class="bp">self</span><span class="o">.</span><span class="n">cnt</span> <span class="o">+=</span> <span class="n">cnt</span>
+
+  <span class="c"># get final result</span>
+  <span class="nd">@output_type</span><span class="p">(</span><span class="s">&#39;int4&#39;</span><span class="p">)</span>
+  <span class="k">def</span> <span class="nf">get_final_result</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+      <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">cnt</span>
+</pre></div>
+</div>
+<p>These classes must provide <code class="docutils literal"><span class="pre">reset()</span></code>, <code class="docutils literal"><span class="pre">eval()</span></code>, <code class="docutils literal"><span class="pre">merge()</span></code>, <code class="docutils literal"><span class="pre">get_partial_result()</span></code>, and <code class="docutils literal"><span class="pre">get_final_result()</span></code> functions.</p>
+<ul class="simple">
+<li><code class="docutils literal"><span class="pre">reset()</span></code> resets the aggregation state.</li>
+<li><code class="docutils literal"><span class="pre">eval()</span></code> evaluates input tuples in the first stage.</li>
+<li><code class="docutils literal"><span class="pre">merge()</span></code> merges intermediate results of the first stage.</li>
+<li><code class="docutils literal"><span class="pre">get_partial_result()</span></code> returns intermediate results of the first stage. Output type must be same with the input type of <code class="docutils literal"><span class="pre">merge()</span></code>.</li>
+<li><code class="docutils literal"><span class="pre">get_final_result()</span></code> returns the final aggregation result.</li>
+</ul>
+</div>
+<div class="section" id="id2">
+<h3>Query example<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h3>
+<p>Once the Python UDAFs are successfully registered, you can use them as other built-in aggregation functions.</p>
+<div class="highlight-sql"><div class="highlight"><pre><span class="k">default</span><span class="o">&gt;</span> <span class="k">select</span> <span class="n">avgpy</span><span class="p">(</span><span class="n">n_nationkey</span><span class="p">),</span> <span class="n">countpy</span><span class="p">()</span> <span class="k">from</span> <span class="n">nation</span><span class="p">;</span>
+</pre></div>
+</div>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">Currently, Python UDAFs cannot be used as window functions.</p>
+</div>
+</div>
+</div>
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