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<!DOCTYPE html>
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<title>7.20.1. Introduction — Groonga v10.1.1-31-g1e46ba6 documentation</title>
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<span class="project">groonga</span>
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<span class="description">An open-source fulltext search engine and column store.</span>
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<li class="nav-item nav-item-this"><a href=""><span class="section-number">7.20.1. </span>Introduction</a></li>
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<div class="section" id="introduction">
<h1><span class="section-number">7.20.1. </span>Introduction<a class="headerlink" href="#introduction" title="Permalink to this headline">¶</a></h1>
<p>The suggest feature in Groonga provides the following features:</p>
<ul class="simple">
<li><p>Completion</p></li>
<li><p>Correction</p></li>
<li><p>Suggestion</p></li>
</ul>
<div class="section" id="completion">
<h2><span class="section-number">7.20.1.1. </span>Completion<a class="headerlink" href="#completion" title="Permalink to this headline">¶</a></h2>
<p>Completion helps user input. If user inputs a partial word,
Groonga can return complete words from registered
words.</p>
<p>For example, there are registered words:</p>
<ul class="simple">
<li><p>“groonga”</p></li>
<li><p>“complete”</p></li>
<li><p>“correction”</p></li>
<li><p>“suggest”</p></li>
</ul>
<p>An user inputs “co” and groonga returns “complete” and
“correction” because they starts with “co”.</p>
<p>An user inputs “sug” and groonga returns “suggest” because
“suggest” starts with “sug”.</p>
<p>An user inputs “ab” and groonga returns nothing because no
word starts with “ab”.</p>
</div>
<div class="section" id="correction">
<h2><span class="section-number">7.20.1.2. </span>Correction<a class="headerlink" href="#correction" title="Permalink to this headline">¶</a></h2>
<p>Correction also helps user input. If user inputs a wrong
word, groonga can return correct words from registered
correction pairs.</p>
<p>For example, there are registered correction pairs:</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 46%" />
<col style="width: 54%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>wrong word</p></th>
<th class="head"><p>correct word</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>grroonga</p></td>
<td><p>groonga</p></td>
</tr>
<tr class="row-odd"><td><p>gronga</p></td>
<td><p>groonga</p></td>
</tr>
<tr class="row-even"><td><p>gronnga</p></td>
<td><p>groonga</p></td>
</tr>
</tbody>
</table>
<p>An user inputs “gronga” and groonga returns “groonga” because
“gronga” is in wrong word and corresponding correct word is
“groonga”.</p>
<p>An user inputs “roonga” and groonga returns nothing because
“roonga” isn’t in wrong word.</p>
</div>
<div class="section" id="suggestion">
<h2><span class="section-number">7.20.1.3. </span>Suggestion<a class="headerlink" href="#suggestion" title="Permalink to this headline">¶</a></h2>
<p>Suggestion helps that user filters many found documents. If
user inputs a query, groonga can return new queries that has
more additional keywords from registered related query
pairs.</p>
<p>For example, there are registered related query pairs:</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 52%" />
<col style="width: 48%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>keyword</p></th>
<th class="head"><p>related query</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>groonga</p></td>
<td><p>groonga search engine</p></td>
</tr>
<tr class="row-odd"><td><p>search</p></td>
<td><p>Google search</p></td>
</tr>
<tr class="row-even"><td><p>speed</p></td>
<td><p>groonga speed</p></td>
</tr>
</tbody>
</table>
<p>An user inputs “groonga” and groonga returns “groonga search
engine” because “groonga” is in keyword column and related
query column is “groonga search engine”.</p>
<p>An user inputs “MySQL” and groonga returns nothing because
“MySQL” isn’t in keyword column values.</p>
</div>
<div class="section" id="learning">
<h2><span class="section-number">7.20.1.4. </span>Learning<a class="headerlink" href="#learning" title="Permalink to this headline">¶</a></h2>
<p>The suggest feature requires registered data before using
the feature. Those data can be registered from user inputs.
Gronnga-suggest-httpd and groonga-suggest-learner commands
are provided for the propose.</p>
</div>
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<h3><a href="../../index.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">7.20.1. Introduction</a><ul>
<li><a class="reference internal" href="#completion">7.20.1.1. Completion</a></li>
<li><a class="reference internal" href="#correction">7.20.1.2. Correction</a></li>
<li><a class="reference internal" href="#suggestion">7.20.1.3. Suggestion</a></li>
<li><a class="reference internal" href="#learning">7.20.1.4. Learning</a></li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
<p class="topless"><a href="../suggest.html"
title="previous chapter"><span class="section-number">7.20. </span>Suggest</a></p>
<h4>Next topic</h4>
<p class="topless"><a href="completion.html"
title="next chapter"><span class="section-number">7.20.2. </span>Completion</a></p>
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