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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.sql.fun</a></div>
<h2 title="Class SqlCountAggFunction" class="title">Class SqlCountAggFunction</h2>
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<pre>public class <span class="typeNameLabel">SqlCountAggFunction</span>
extends <a href="../SqlAggFunction.html" title="class in org.apache.calcite.sql">SqlAggFunction</a></pre>
<div class="block">Definition of the SQL <code>COUNT</code> aggregation function.
<p><code>COUNT</code> is an aggregator which returns the number of rows which
have gone into it. With one argument (or more), it returns the number of rows
for which that argument (or all) is not <code>null</code>.</div>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.String)">SqlCountAggFunction</a></span>&#8203;(java.lang.String&nbsp;name)</code></th>
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<code><a href="../SqlAggFunction.html#allowsFilter()">allowsFilter</a>, <a href="../SqlAggFunction.html#allowsNullTreatment()">allowsNullTreatment</a>, <a href="../SqlAggFunction.html#getDistinctOptionality()">getDistinctOptionality</a>, <a href="../SqlAggFunction.html#isAggregator()">isAggregator</a>, <a href="../SqlAggFunction.html#isQuantifierAllowed()">isQuantifierAllowed</a>, <a href="../SqlAggFunction.html#requiresGroupOrder()">requiresGroupOrder</a>, <a href="../SqlAggFunction.html#requiresOrder()">requiresOrder</a>, <a href="../SqlAggFunction.html#requiresOver()">requiresOver</a>, <a href="../SqlAggFunction.html#validateCall(org.apache.calcite.sql.SqlCall,org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.validate.SqlValidatorScope)">validateCall</a></code></li>
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<h4>SqlCountAggFunction</h4>
<pre>public&nbsp;SqlCountAggFunction&#8203;(java.lang.String&nbsp;name)</pre>
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<h4>SqlCountAggFunction</h4>
<pre>public&nbsp;SqlCountAggFunction&#8203;(java.lang.String&nbsp;name,
<a href="../type/SqlOperandTypeChecker.html" title="interface in org.apache.calcite.sql.type">SqlOperandTypeChecker</a>&nbsp;sqlOperandTypeChecker)</pre>
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<h4>getSyntax</h4>
<pre class="methodSignature">public&nbsp;<a href="../SqlSyntax.html" title="enum in org.apache.calcite.sql">SqlSyntax</a>&nbsp;getSyntax()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../SqlOperator.html#getSyntax()">SqlOperator</a></code></span></div>
<div class="block">Returns the syntactic type of this operator, never null.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../SqlFunction.html#getSyntax()">getSyntax</a></code>&nbsp;in class&nbsp;<code><a href="../SqlFunction.html" title="class in org.apache.calcite.sql">SqlFunction</a></code></dd>
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<h4>getParameterTypes</h4>
<pre class="methodSignature">public&nbsp;java.util.List&lt;<a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&gt;&nbsp;getParameterTypes&#8203;(<a href="../../rel/type/RelDataTypeFactory.html" title="interface in org.apache.calcite.rel.type">RelDataTypeFactory</a>&nbsp;typeFactory)</pre>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../SqlAggFunction.html#getParameterTypes(org.apache.calcite.rel.type.RelDataTypeFactory)">getParameterTypes</a></code>&nbsp;in class&nbsp;<code><a href="../SqlAggFunction.html" title="class in org.apache.calcite.sql">SqlAggFunction</a></code></dd>
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<h4>getReturnType</h4>
<pre class="methodSignature">public&nbsp;<a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;getReturnType&#8203;(<a href="../../rel/type/RelDataTypeFactory.html" title="interface in org.apache.calcite.rel.type">RelDataTypeFactory</a>&nbsp;typeFactory)</pre>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../SqlAggFunction.html#getReturnType(org.apache.calcite.rel.type.RelDataTypeFactory)">getReturnType</a></code>&nbsp;in class&nbsp;<code><a href="../SqlAggFunction.html" title="class in org.apache.calcite.sql">SqlAggFunction</a></code></dd>
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<h4>deriveType</h4>
<pre class="methodSignature">public&nbsp;<a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;deriveType&#8203;(<a href="../validate/SqlValidator.html" title="interface in org.apache.calcite.sql.validate">SqlValidator</a>&nbsp;validator,
<a href="../validate/SqlValidatorScope.html" title="interface in org.apache.calcite.sql.validate">SqlValidatorScope</a>&nbsp;scope,
<a href="../SqlCall.html" title="class in org.apache.calcite.sql">SqlCall</a>&nbsp;call)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../SqlOperator.html#deriveType(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall)">SqlOperator</a></code></span></div>
<div class="block">Derives the type of a call to this operator.
<p>This method is an intrinsic part of the validation process so, unlike
<a href="../SqlOperator.html#inferReturnType(org.apache.calcite.sql.SqlOperatorBinding)"><code>SqlOperator.inferReturnType(org.apache.calcite.sql.SqlOperatorBinding)</code></a>, specific operators would not typically override
this method.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../SqlFunction.html#deriveType(org.apache.calcite.sql.validate.SqlValidator,org.apache.calcite.sql.validate.SqlValidatorScope,org.apache.calcite.sql.SqlCall)">deriveType</a></code>&nbsp;in class&nbsp;<code><a href="../SqlFunction.html" title="class in org.apache.calcite.sql">SqlFunction</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>validator</code> - Validator</dd>
<dd><code>scope</code> - Scope of validation</dd>
<dd><code>call</code> - Call to this operator</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Type of call</dd>
</dl>
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<a id="unwrap(java.lang.Class)">
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<h4>unwrap</h4>
<pre class="methodSignature">public&nbsp;&lt;T&gt;&nbsp;T&nbsp;unwrap&#8203;(java.lang.Class&lt;T&gt;&nbsp;clazz)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../schema/Wrapper.html#unwrap(java.lang.Class)">Wrapper</a></code></span></div>
<div class="block">Finds an instance of an interface implemented by this object,
or returns null if this object does not support that interface.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../schema/Wrapper.html#unwrap(java.lang.Class)">unwrap</a></code>&nbsp;in interface&nbsp;<code><a href="../../schema/Wrapper.html" title="interface in org.apache.calcite.schema">Wrapper</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../SqlAggFunction.html#unwrap(java.lang.Class)">unwrap</a></code>&nbsp;in class&nbsp;<code><a href="../SqlAggFunction.html" title="class in org.apache.calcite.sql">SqlAggFunction</a></code></dd>
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