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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.adapter.enumerable</a></div>
<h1 title="Class RexImpTable.LeadImplementor" class="title">Class RexImpTable.LeadImplementor</h1>
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<dt>All Implemented Interfaces:</dt>
<dd><code><a href="AggImplementor.html" title="interface in org.apache.calcite.adapter.enumerable">AggImplementor</a></code>, <code><a href="WinAggImplementor.html" title="interface in org.apache.calcite.adapter.enumerable">WinAggImplementor</a></code></dd>
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<dt>Enclosing class:</dt>
<dd><a href="RexImpTable.html" title="class in org.apache.calcite.adapter.enumerable">RexImpTable</a></dd>
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<pre>public static class <span class="typeNameLabel">RexImpTable.LeadImplementor</span>
extends <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></pre>
<div class="block">Implementor for the <code>LEAD</code> windowed aggregate function.</div>
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<h2>Nested classes/interfaces inherited from interface&nbsp;org.apache.calcite.adapter.enumerable.<a href="WinAggImplementor.html" title="interface in org.apache.calcite.adapter.enumerable">WinAggImplementor</a></h2>
<a id="nested.classes.inherited.from.class.org.apache.calcite.adapter.enumerable.WinAggImplementor">
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</a><code><a href="WinAggImplementor.SeekType.html" title="enum in org.apache.calcite.adapter.enumerable">WinAggImplementor.SeekType</a></code></div>
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<td class="colFirst"><code>protected </code></td>
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">LeadImplementor</a></span>()</code></th>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a>&lt;<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getStateType(org.apache.calcite.adapter.enumerable.AggContext)">getStateType</a></span>&#8203;(<a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a>&nbsp;info)</code></th>
<td class="colLast">
<div class="block">Returns the types of the intermediate variables used by the aggregate
implementation.</div>
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<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#implementAdd(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggAddContext)">implementAdd</a></span>&#8203;(<a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a>&nbsp;info,
<a href="AggAddContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggAddContext</a>&nbsp;add)</code></th>
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<div class="block">Updates intermediate values to account for the newly added value.</div>
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<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#implementReset(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggResetContext)">implementReset</a></span>&#8203;(<a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a>&nbsp;info,
<a href="AggResetContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggResetContext</a>&nbsp;reset)</code></th>
<td class="colLast">
<div class="block">Implements reset of the intermediate variables to the initial state.</div>
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<tr class="rowColor" id="i3">
<td class="colFirst"><code><a href="../../linq4j/tree/Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#implementResult(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggResultContext)">implementResult</a></span>&#8203;(<a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a>&nbsp;info,
<a href="AggResultContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggResultContext</a>&nbsp;result)</code></th>
<td class="colLast">
<div class="block">Calculates the resulting value based on the intermediate variables.</div>
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<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#needCacheWhenFrameIntact()">needCacheWhenFrameIntact</a></span>()</code></th>
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<h3><a id="&lt;init&gt;()">LeadImplementor</a></h3>
<div class="memberSignature"><span class="modifiers">protected</span>&nbsp;<span class="memberName">LeadImplementor</span>()</div>
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<h3><a id="getStateType(org.apache.calcite.adapter.enumerable.AggContext)">getStateType</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType"><a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a>&lt;<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&gt;</span>&nbsp;<span class="memberName">getStateType</span>&#8203;(<span class="arguments"><a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a>&nbsp;info)</span></div>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="AggImplementor.html#getStateType(org.apache.calcite.adapter.enumerable.AggContext)">AggImplementor</a></code></span></div>
<div class="block">Returns the types of the intermediate variables used by the aggregate
implementation.
<p>For instance, for "concatenate to string" this can be
<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/StringBuilder.html?is-external=true" title="class or interface in java.lang" class="externalLink"><code>StringBuilder</code></a>.
Calcite calls this method before all other <code>implement*</code> methods.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="AggImplementor.html#getStateType(org.apache.calcite.adapter.enumerable.AggContext)">getStateType</a></code>&nbsp;in interface&nbsp;<code><a href="AggImplementor.html" title="interface in org.apache.calcite.adapter.enumerable">AggImplementor</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>info</code> - Aggregate context</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Types of the intermediate variables used by the aggregate
implementation</dd>
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<h3><a id="implementReset(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggResetContext)">implementReset</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType">void</span>&nbsp;<span class="memberName">implementReset</span>&#8203;(<span class="arguments"><a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a>&nbsp;info,
<a href="AggResetContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggResetContext</a>&nbsp;reset)</span></div>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="AggImplementor.html#implementReset(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggResetContext)">AggImplementor</a></code></span></div>
<div class="block">Implements reset of the intermediate variables to the initial state.
<a href="AggResetContext.html#accumulator()"><code>AggResetContext.accumulator()</code></a> should be used to reference
the state variables.
For instance, to zero the count, use the following code:
<blockquote><code>reset.currentBlock().add(<br>
Expressions.statement(<br>
Expressions.assign(reset.accumulator().get(0),<br>
Expressions.constant(0)));</code></blockquote></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="AggImplementor.html#implementReset(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggResetContext)">implementReset</a></code>&nbsp;in interface&nbsp;<code><a href="AggImplementor.html" title="interface in org.apache.calcite.adapter.enumerable">AggImplementor</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>info</code> - Aggregate context</dd>
<dd><code>reset</code> - Reset context</dd>
</dl>
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<h3><a id="implementAdd(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggAddContext)">implementAdd</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType">void</span>&nbsp;<span class="memberName">implementAdd</span>&#8203;(<span class="arguments"><a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a>&nbsp;info,
<a href="AggAddContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggAddContext</a>&nbsp;add)</span></div>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="AggImplementor.html#implementAdd(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggAddContext)">AggImplementor</a></code></span></div>
<div class="block">Updates intermediate values to account for the newly added value.
<a href="AggResetContext.html#accumulator()"><code>AggResetContext.accumulator()</code></a> should be used to reference
the state variables.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="AggImplementor.html#implementAdd(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggAddContext)">implementAdd</a></code>&nbsp;in interface&nbsp;<code><a href="AggImplementor.html" title="interface in org.apache.calcite.adapter.enumerable">AggImplementor</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>info</code> - Aggregate context</dd>
<dd><code>add</code> - Add context</dd>
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<h3><a id="needCacheWhenFrameIntact()">needCacheWhenFrameIntact</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType">boolean</span>&nbsp;<span class="memberName">needCacheWhenFrameIntact</span>()</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="WinAggImplementor.html#needCacheWhenFrameIntact()">needCacheWhenFrameIntact</a></code>&nbsp;in interface&nbsp;<code><a href="WinAggImplementor.html" title="interface in org.apache.calcite.adapter.enumerable">WinAggImplementor</a></code></dd>
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<h3><a id="implementResult(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggResultContext)">implementResult</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType"><a href="../../linq4j/tree/Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></span>&nbsp;<span class="memberName">implementResult</span>&#8203;(<span class="arguments"><a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a>&nbsp;info,
<a href="AggResultContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggResultContext</a>&nbsp;result)</span></div>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="AggImplementor.html#implementResult(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggResultContext)">AggImplementor</a></code></span></div>
<div class="block">Calculates the resulting value based on the intermediate variables.
Note: this method must NOT destroy the intermediate variables as
calcite might reuse the state when calculating sliding aggregates.
<a href="AggResetContext.html#accumulator()"><code>AggResetContext.accumulator()</code></a> should be used to reference
the state variables.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="AggImplementor.html#implementResult(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggResultContext)">implementResult</a></code>&nbsp;in interface&nbsp;<code><a href="AggImplementor.html" title="interface in org.apache.calcite.adapter.enumerable">AggImplementor</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>info</code> - Aggregate context</dd>
<dd><code>result</code> - Result context</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Expression that is a result of calculating final value of
the aggregate being implemented</dd>
</dl>
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