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<h1 id="develop-types--page-root">Types<a class="headerlink" href="#develop-types--page-root" title="Permalink to this headline">#</a></h1>
<p>The <code class="docutils literal notranslate"><span class="pre">Type</span></code> interface in Trino is used to implement a type in the SQL language.
Trino ships with a number of built-in types, like <code class="docutils literal notranslate"><span class="pre">VarcharType</span></code> and <code class="docutils literal notranslate"><span class="pre">BigintType</span></code>.
The <code class="docutils literal notranslate"><span class="pre">ParametricType</span></code> interface is used to provide type parameters for types, to
allow types like <code class="docutils literal notranslate"><span class="pre">VARCHAR(10)</span></code> or <code class="docutils literal notranslate"><span class="pre">DECIMAL(22,</span> <span class="pre">5)</span></code>. A <code class="docutils literal notranslate"><span class="pre">Plugin</span></code> can provide
new <code class="docutils literal notranslate"><span class="pre">Type</span></code> objects by returning them from <code class="docutils literal notranslate"><span class="pre">getTypes()</span></code> and new <code class="docutils literal notranslate"><span class="pre">ParametricType</span></code>
objects by returning them from <code class="docutils literal notranslate"><span class="pre">getParametricTypes()</span></code>.</p>
<p>Below is a high level overview of the <code class="docutils literal notranslate"><span class="pre">Type</span></code> interface. For more details, see the
JavaDocs for <code class="docutils literal notranslate"><span class="pre">Type</span></code>.</p>

<h2 id="native-container-type">Native container type<a class="headerlink" href="#native-container-type" title="Permalink to this headline">#</a></h2>
<p>All types define the <code class="docutils literal notranslate"><span class="pre">getJavaType()</span></code> method, frequently referred to as the
“native container type”. This is the Java type used to hold values during execution
and to store them in a <code class="docutils literal notranslate"><span class="pre">Block</span></code>. For example, this is the type used in
the Java code that implements functions that produce or consume this <code class="docutils literal notranslate"><span class="pre">Type</span></code>.</p>


<h2 id="native-encoding">Native encoding<a class="headerlink" href="#native-encoding" title="Permalink to this headline">#</a></h2>
<p>The interpretation of a value in its native container type form is defined by its
<code class="docutils literal notranslate"><span class="pre">Type</span></code>. For some types, such as <code class="docutils literal notranslate"><span class="pre">BigintType</span></code>, it matches the Java
interpretation of the native container type (64bit 2’s complement). However, for other
types such as <code class="docutils literal notranslate"><span class="pre">TimestampWithTimeZoneType</span></code>, which also uses <code class="docutils literal notranslate"><span class="pre">long</span></code> for its
native container type, the value stored in the <code class="docutils literal notranslate"><span class="pre">long</span></code> is a 8byte binary value
combining the timezone and the milliseconds since the unix epoch. In particular,
this means that you cannot compare two native values and expect a meaningful
result, without knowing the native encoding.</p>


<h2 id="type-signature">Type signature<a class="headerlink" href="#type-signature" title="Permalink to this headline">#</a></h2>
<p>The signature of a type defines its identity, and also encodes some general
information about the type, such as its type parameters (if it’s parametric),
and its literal parameters. The literal parameters are used in types like
<code class="docutils literal notranslate"><span class="pre">VARCHAR(10)</span></code>.</p>


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