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| <div class="subTitle">org.apache.calcite.adapter.enumerable</div> |
| <h2 title="Class RexImpTable.LagImplementor" class="title">Class RexImpTable.LagImplementor</h2> |
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| <ul class="inheritance"> |
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| <li>org.apache.calcite.adapter.enumerable.RexImpTable.LagImplementor</li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../org/apache/calcite/adapter/enumerable/AggImplementor.html" title="interface in org.apache.calcite.adapter.enumerable">AggImplementor</a>, <a href="../../../../../org/apache/calcite/adapter/enumerable/WinAggImplementor.html" title="interface in org.apache.calcite.adapter.enumerable">WinAggImplementor</a></dd> |
| </dl> |
| <dl> |
| <dt>Enclosing class:</dt> |
| <dd><a href="../../../../../org/apache/calcite/adapter/enumerable/RexImpTable.html" title="class in org.apache.calcite.adapter.enumerable">RexImpTable</a></dd> |
| </dl> |
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| <br> |
| <pre>public static class <span class="typeNameLabel">RexImpTable.LagImplementor</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Implementor for the <code>LAG</code> windowed aggregate function.</div> |
| </li> |
| </ul> |
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| <h3>Nested classes/interfaces inherited from interface org.apache.calcite.adapter.enumerable.<a href="../../../../../org/apache/calcite/adapter/enumerable/WinAggImplementor.html" title="interface in org.apache.calcite.adapter.enumerable">WinAggImplementor</a></h3> |
| <code><a href="../../../../../org/apache/calcite/adapter/enumerable/WinAggImplementor.SeekType.html" title="enum in org.apache.calcite.adapter.enumerable">WinAggImplementor.SeekType</a></code></li> |
| </ul> |
| </li> |
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| <th class="colFirst" scope="col">Modifier</th> |
| <th class="colLast" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/adapter/enumerable/RexImpTable.LagImplementor.html#LagImplementor--">LagImplementor</a></span>()</code> </td> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect">Type</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/adapter/enumerable/RexImpTable.LagImplementor.html#getStateType-org.apache.calcite.adapter.enumerable.AggContext-">getStateType</a></span>(<a href="../../../../../org/apache/calcite/adapter/enumerable/AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info)</code> |
| <div class="block">Returns the types of the intermediate variables used by the aggregate |
| implementation.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/adapter/enumerable/RexImpTable.LagImplementor.html#implementAdd-org.apache.calcite.adapter.enumerable.AggContext-org.apache.calcite.adapter.enumerable.AggAddContext-">implementAdd</a></span>(<a href="../../../../../org/apache/calcite/adapter/enumerable/AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info, |
| <a href="../../../../../org/apache/calcite/adapter/enumerable/AggAddContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggAddContext</a> add)</code> |
| <div class="block">Updates intermediate values to account for the newly added value.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/adapter/enumerable/RexImpTable.LagImplementor.html#implementReset-org.apache.calcite.adapter.enumerable.AggContext-org.apache.calcite.adapter.enumerable.AggResetContext-">implementReset</a></span>(<a href="../../../../../org/apache/calcite/adapter/enumerable/AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info, |
| <a href="../../../../../org/apache/calcite/adapter/enumerable/AggResetContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggResetContext</a> reset)</code> |
| <div class="block">Implements reset of the intermediate variables to the initial state.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/calcite/linq4j/tree/Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/adapter/enumerable/RexImpTable.LagImplementor.html#implementResult-org.apache.calcite.adapter.enumerable.AggContext-org.apache.calcite.adapter.enumerable.AggResultContext-">implementResult</a></span>(<a href="../../../../../org/apache/calcite/adapter/enumerable/AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info, |
| <a href="../../../../../org/apache/calcite/adapter/enumerable/AggResultContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggResultContext</a> result)</code> |
| <div class="block">Calculates the resulting value based on the intermediate variables.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/adapter/enumerable/RexImpTable.LagImplementor.html#needCacheWhenFrameIntact--">needCacheWhenFrameIntact</a></span>()</code> </td> |
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| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| </a> |
| <h3>Constructor Detail</h3> |
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| <h4>LagImplementor</h4> |
| <pre>protected LagImplementor()</pre> |
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| </a> |
| <h3>Method Detail</h3> |
| <a name="getStateType-org.apache.calcite.adapter.enumerable.AggContext-"> |
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| </a> |
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| <h4>getStateType</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect">Type</a>> getStateType(<a href="../../../../../org/apache/calcite/adapter/enumerable/AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/calcite/adapter/enumerable/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/8/docs/api/java/lang/StringBuilder.html?is-external=true" title="class or interface in java.lang"><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="../../../../../org/apache/calcite/adapter/enumerable/AggImplementor.html#getStateType-org.apache.calcite.adapter.enumerable.AggContext-">getStateType</a></code> in interface <code><a href="../../../../../org/apache/calcite/adapter/enumerable/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> |
| </dl> |
| </li> |
| </ul> |
| <a name="implementReset-org.apache.calcite.adapter.enumerable.AggContext-org.apache.calcite.adapter.enumerable.AggResetContext-"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>implementReset</h4> |
| <pre>public void implementReset(<a href="../../../../../org/apache/calcite/adapter/enumerable/AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info, |
| <a href="../../../../../org/apache/calcite/adapter/enumerable/AggResetContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggResetContext</a> reset)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/calcite/adapter/enumerable/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="../../../../../org/apache/calcite/adapter/enumerable/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="../../../../../org/apache/calcite/adapter/enumerable/AggImplementor.html#implementReset-org.apache.calcite.adapter.enumerable.AggContext-org.apache.calcite.adapter.enumerable.AggResetContext-">implementReset</a></code> in interface <code><a href="../../../../../org/apache/calcite/adapter/enumerable/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> |
| </li> |
| </ul> |
| <a name="implementAdd-org.apache.calcite.adapter.enumerable.AggContext-org.apache.calcite.adapter.enumerable.AggAddContext-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>implementAdd</h4> |
| <pre>public void implementAdd(<a href="../../../../../org/apache/calcite/adapter/enumerable/AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info, |
| <a href="../../../../../org/apache/calcite/adapter/enumerable/AggAddContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggAddContext</a> add)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/calcite/adapter/enumerable/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="../../../../../org/apache/calcite/adapter/enumerable/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="../../../../../org/apache/calcite/adapter/enumerable/AggImplementor.html#implementAdd-org.apache.calcite.adapter.enumerable.AggContext-org.apache.calcite.adapter.enumerable.AggAddContext-">implementAdd</a></code> in interface <code><a href="../../../../../org/apache/calcite/adapter/enumerable/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> |
| </dl> |
| </li> |
| </ul> |
| <a name="needCacheWhenFrameIntact--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>needCacheWhenFrameIntact</h4> |
| <pre>public boolean needCacheWhenFrameIntact()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/calcite/adapter/enumerable/WinAggImplementor.html#needCacheWhenFrameIntact--">needCacheWhenFrameIntact</a></code> in interface <code><a href="../../../../../org/apache/calcite/adapter/enumerable/WinAggImplementor.html" title="interface in org.apache.calcite.adapter.enumerable">WinAggImplementor</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="implementResult-org.apache.calcite.adapter.enumerable.AggContext-org.apache.calcite.adapter.enumerable.AggResultContext-"> |
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| </a> |
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| <h4>implementResult</h4> |
| <pre>public <a href="../../../../../org/apache/calcite/linq4j/tree/Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a> implementResult(<a href="../../../../../org/apache/calcite/adapter/enumerable/AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info, |
| <a href="../../../../../org/apache/calcite/adapter/enumerable/AggResultContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggResultContext</a> result)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/calcite/adapter/enumerable/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="../../../../../org/apache/calcite/adapter/enumerable/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="../../../../../org/apache/calcite/adapter/enumerable/AggImplementor.html#implementResult-org.apache.calcite.adapter.enumerable.AggContext-org.apache.calcite.adapter.enumerable.AggResultContext-">implementResult</a></code> in interface <code><a href="../../../../../org/apache/calcite/adapter/enumerable/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> |
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