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<div class="section" id="normalizers">
<h1><span class="section-number">7.7. </span>Normalizers<a class="headerlink" href="#normalizers" title="Permalink to this headline">¶</a></h1>
<div class="section" id="summary">
<h2><span class="section-number">7.7.1. </span>Summary<a class="headerlink" href="#summary" title="Permalink to this headline">¶</a></h2>
<p>Groonga has normalizer module that normalizes text. It is used when
tokenizing text and storing table key. For example, <code class="docutils literal notranslate"><span class="pre">A</span></code> and <code class="docutils literal notranslate"><span class="pre">a</span></code>
are processed as the same character after normalization.</p>
<p>Normalizer module can be added as a plugin. You can customize text
normalization by registering your normalizer plugins to Groonga.</p>
<p>A normalizer module is attached to a table. A table can have zero or
one normalizer module. You can attach a normalizer module to a table
by <a class="reference internal" href="commands/table_create.html#table-create-normalizer"><span class="std std-ref">normalizer</span></a> option in
<a class="reference internal" href="commands/table_create.html"><span class="doc">table_create</span></a>.</p>
<p>Here is an example <code class="docutils literal notranslate"><span class="pre">table_create</span></code> that uses <code class="docutils literal notranslate"><span class="pre">NormalizerAuto</span></code>
normalizer module:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_create Dictionary TABLE_HASH_KEY ShortText --normalizer NormalizerAuto
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Groonga 2.0.9 or earlier doesn’t have <code class="docutils literal notranslate"><span class="pre">--normalizer</span></code> option in
<code class="docutils literal notranslate"><span class="pre">table_create</span></code>. <code class="docutils literal notranslate"><span class="pre">KEY_NORMALIZE</span></code> flag was used instead.</p>
<p>You can open an old database by Groonga 2.1.0 or later. An old
database means that the database is created by Groonga 2.0.9 or
earlier. But you cannot open the opened old database by Groonga
2.0.9 or earlier. Once you open the old database by Groonga 2.1.0
or later, <code class="docutils literal notranslate"><span class="pre">KEY_NORMALIZE</span></code> flag information in the old database is
converted to normalizer information. So Groonga 2.0.9 or earlier
cannot find <code class="docutils literal notranslate"><span class="pre">KEY_NORMALIZE</span></code> flag information in the opened old
database.</p>
</div>
<p>Keys of a table that has a normalizer module are normalized:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>load --table Dictionary
[
{"_key": "Apple"},
{"_key": "black"},
{"_key": "COLOR"}
]
# [[0, 1337566253.89858, 0.000355720520019531], 3]
select Dictionary
# [
# [
# 0,
# 1337566253.89858,
# 0.000355720520019531
# ],
# [
# [
# [
# 3
# ],
# [
# [
# "_id",
# "UInt32"
# ],
# [
# "_key",
# "ShortText"
# ]
# ],
# [
# 1,
# "apple"
# ],
# [
# 2,
# "black"
# ],
# [
# 3,
# "color"
# ]
# ]
# ]
# ]
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">NormalizerAuto</span></code> normalizer normalizes a text as a downcased text.
For example, <code class="docutils literal notranslate"><span class="pre">"Apple"</span></code> is normalized to <code class="docutils literal notranslate"><span class="pre">"apple"</span></code>, <code class="docutils literal notranslate"><span class="pre">"black"</span></code> is
normalized to <code class="docutils literal notranslate"><span class="pre">"black"</span></code> and <code class="docutils literal notranslate"><span class="pre">"COLOR"</span></code> is normalized to
<code class="docutils literal notranslate"><span class="pre">"color"</span></code>.</p>
<p>If a table is a lexicon for fulltext search, tokenized tokens are
normalized. Because tokens are stored as table keys. Table keys are
normalized as described above.</p>
</div>
<div class="section" id="built-in-normalizers">
<h2><span class="section-number">7.7.2. </span>Built-in normalizers<a class="headerlink" href="#built-in-normalizers" title="Permalink to this headline">¶</a></h2>
<p>Here is a list of built-in normalizers:</p>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="normalizers/normalizer_auto.html">7.7.2.1. <code class="docutils literal notranslate"><span class="pre">NormalizerAuto</span></code></a></li>
<li class="toctree-l1"><a class="reference internal" href="normalizers/normalizer_nfkc100.html">7.7.2.2. <code class="docutils literal notranslate"><span class="pre">NormalizerNFKC100</span></code></a></li>
<li class="toctree-l1"><a class="reference internal" href="normalizers/normalizer_nfkc51.html">7.7.2.3. <code class="docutils literal notranslate"><span class="pre">NormalizerNFKC51</span></code></a></li>
</ul>
</div>
</div>
<div class="section" id="additional-normalizers">
<h2><span class="section-number">7.7.3. </span>Additional normalizers<a class="headerlink" href="#additional-normalizers" title="Permalink to this headline">¶</a></h2>
<p>There are additional normalizers:</p>
<blockquote>
<div><ul class="simple">
<li><p><a class="reference external" href="https://github.com/groonga/groonga-normalizer-mysql">groonga-normalizer-mysql</a></p></li>
</ul>
</div></blockquote>
</div>
<div class="section" id="see-also">
<h2><span class="section-number">7.7.4. </span>See also<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><p><a class="reference internal" href="commands/table_create.html"><span class="doc">table_create</span></a></p></li>
</ul>
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<h3><a href="../index.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">7.7. Normalizers</a><ul>
<li><a class="reference internal" href="#summary">7.7.1. Summary</a></li>
<li><a class="reference internal" href="#built-in-normalizers">7.7.2. Built-in normalizers</a></li>
<li><a class="reference internal" href="#additional-normalizers">7.7.3. Additional normalizers</a></li>
<li><a class="reference internal" href="#see-also">7.7.4. See also</a></li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
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<p class="topless"><a href="normalizers/normalizer_auto.html"
title="next chapter"><span class="section-number">7.7.2.1. </span><code class="docutils literal notranslate"><span class="pre">NormalizerAuto</span></code></a></p>
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