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<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.schema</a></div>
<h1 title="Interface Function" class="title">Interface Function</h1>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>All Known Subinterfaces:</dt>
<dd><code><a href="AggregateFunction.html" title="interface in org.apache.calcite.schema">AggregateFunction</a></code>, <code><a href="ImplementableAggFunction.html" title="interface in org.apache.calcite.schema">ImplementableAggFunction</a></code>, <code><a href="ImplementableFunction.html" title="interface in org.apache.calcite.schema">ImplementableFunction</a></code>, <code><a href="ScalarFunction.html" title="interface in org.apache.calcite.schema">ScalarFunction</a></code>, <code><a href="TableFunction.html" title="interface in org.apache.calcite.schema">TableFunction</a></code>, <code><a href="TableMacro.html" title="interface in org.apache.calcite.schema">TableMacro</a></code></dd>
</dl>
<dl class="notes">
<dt>All Known Implementing Classes:</dt>
<dd><code><a href="impl/AggregateFunctionImpl.html" title="class in org.apache.calcite.schema.impl">AggregateFunctionImpl</a></code>, <code><a href="impl/MaterializedViewTable.MaterializedViewTableMacro.html" title="class in org.apache.calcite.schema.impl">MaterializedViewTable.MaterializedViewTableMacro</a></code>, <code><a href="../test/catalog/MockCatalogReader.MockModifiableViewRelOptTable.MockViewTableMacro.html" title="class in org.apache.calcite.test.catalog">MockCatalogReader.MockModifiableViewRelOptTable.MockViewTableMacro</a></code>, <code><a href="impl/ReflectiveFunctionBase.html" title="class in org.apache.calcite.schema.impl">ReflectiveFunctionBase</a></code>, <code><a href="impl/ScalarFunctionImpl.html" title="class in org.apache.calcite.schema.impl">ScalarFunctionImpl</a></code>, <code><a href="../util/Smalls.SimpleTableMacro.html" title="class in org.apache.calcite.util">Smalls.SimpleTableMacro</a></code>, <code><a href="../sql/advise/SqlAdvisorGetHintsFunction.html" title="class in org.apache.calcite.sql.advise">SqlAdvisorGetHintsFunction</a></code>, <code><a href="../sql/advise/SqlAdvisorGetHintsFunction2.html" title="class in org.apache.calcite.sql.advise">SqlAdvisorGetHintsFunction2</a></code>, <code><a href="impl/TableFunctionImpl.html" title="class in org.apache.calcite.schema.impl">TableFunctionImpl</a></code>, <code><a href="impl/TableMacroImpl.html" title="class in org.apache.calcite.schema.impl">TableMacroImpl</a></code>, <code><a href="impl/ViewTableMacro.html" title="class in org.apache.calcite.schema.impl">ViewTableMacro</a></code></dd>
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<div class="type-signature"><span class="modifiers">public interface </span><span class="element-name type-name-label">Function</span></div>
<div class="block">Named expression that accepts parameters and returns a result.
<p>The application may occur at compile time (for a macro) or at run time
(for a regular function). The result may be a relation, and so might any of
the parameters.</p>
<p>Functions are registered in a <a href="Schema.html" title="interface in org.apache.calcite.schema"><code>Schema</code></a>, and may be queried by name
(<a href="Schema.html#getFunctions(java.lang.String)"><code>Schema.getFunctions(String)</code></a>) then overloads resolved based on
parameter types.</p></div>
<dl class="notes">
<dt>See Also:</dt>
<dd>
<ul class="see-list">
<li><a href="TableMacro.html" title="interface in org.apache.calcite.schema"><code>TableMacro</code></a></li>
<li><a href="ScalarFunction.html" title="interface in org.apache.calcite.schema"><code>ScalarFunction</code></a></li>
</ul>
</dd>
</dl>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ========== METHOD SUMMARY =========== -->
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<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
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<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="FunctionParameter.html" title="interface in org.apache.calcite.schema">FunctionParameter</a>&gt;</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getParameters()" class="member-name-link">getParameters</a>()</code></div>
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<div class="block">Returns the parameters of this function.</div>
</div>
</div>
</div>
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</section>
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</section>
<section class="details">
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<h2>Method Details</h2>
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<section class="detail" id="getParameters()">
<h3>getParameters</h3>
<div class="member-signature"><span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="FunctionParameter.html" title="interface in org.apache.calcite.schema">FunctionParameter</a>&gt;</span>&nbsp;<span class="element-name">getParameters</span>()</div>
<div class="block">Returns the parameters of this function.</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>Parameters; never null</dd>
</dl>
</section>
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