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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.adapter.enumerable</a></div> |
| <h1 title="Interface AggImplementor" class="title">Interface AggImplementor</h1> |
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| <dt>All Known Subinterfaces:</dt> |
| <dd><code><a href="WinAggImplementor.html" title="interface in org.apache.calcite.adapter.enumerable">WinAggImplementor</a></code></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="RexImpTable.LagImplementor.html" title="class in org.apache.calcite.adapter.enumerable">RexImpTable.LagImplementor</a></code>, <code><a href="RexImpTable.LeadImplementor.html" title="class in org.apache.calcite.adapter.enumerable">RexImpTable.LeadImplementor</a></code>, <code><a href="RexImpTable.UserDefinedAggReflectiveImplementor.html" title="class in org.apache.calcite.adapter.enumerable">RexImpTable.UserDefinedAggReflectiveImplementor</a></code>, <code><a href="StrictAggImplementor.html" title="class in org.apache.calcite.adapter.enumerable">StrictAggImplementor</a></code>, <code><a href="StrictWinAggImplementor.html" title="class in org.apache.calcite.adapter.enumerable">StrictWinAggImplementor</a></code></dd> |
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| <hr> |
| <pre>public interface <span class="typeNameLabel">AggImplementor</span></pre> |
| <div class="block">Implements an aggregate function by generating expressions to |
| initialize, add to, and get a result from, an accumulator.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="StrictAggImplementor.html" title="class in org.apache.calcite.adapter.enumerable"><code>StrictAggImplementor</code></a>, |
| <a href="StrictWinAggImplementor.html" title="class in org.apache.calcite.adapter.enumerable"><code>StrictWinAggImplementor</code></a>, |
| <code>RexImpTable.CountImplementor</code>, |
| <code>RexImpTable.SumImplementor</code></dd> |
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| <h2>Method Summary</h2> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
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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><<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>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getStateType(org.apache.calcite.adapter.enumerable.AggContext)">getStateType</a></span>​(<a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the types of the intermediate variables used by the aggregate |
| implementation.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i1"> |
| <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>​(<a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info, |
| <a href="AggAddContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggAddContext</a> add)</code></th> |
| <td class="colLast"> |
| <div class="block">Updates intermediate values to account for the newly added value.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i2"> |
| <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>​(<a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info, |
| <a href="AggResetContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggResetContext</a> reset)</code></th> |
| <td class="colLast"> |
| <div class="block">Implements reset of the intermediate variables to the initial state.</div> |
| </td> |
| </tr> |
| <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>​(<a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info, |
| <a href="AggResultContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggResultContext</a> result)</code></th> |
| <td class="colLast"> |
| <div class="block">Calculates the resulting value based on the intermediate variables.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
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| <h3><a id="getStateType(org.apache.calcite.adapter.enumerable.AggContext)">getStateType</a></h3> |
| <div class="memberSignature"><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><<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>></span> <span class="memberName">getStateType</span>​(<span class="arguments"><a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info)</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="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> |
| </section> |
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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="returnType">void</span> <span class="memberName">implementReset</span>​(<span class="arguments"><a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info, |
| <a href="AggResetContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggResetContext</a> reset)</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="paramLabel">Parameters:</span></dt> |
| <dd><code>info</code> - Aggregate context</dd> |
| <dd><code>reset</code> - Reset context</dd> |
| </dl> |
| </section> |
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| <li class="blockList"> |
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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="returnType">void</span> <span class="memberName">implementAdd</span>​(<span class="arguments"><a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info, |
| <a href="AggAddContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggAddContext</a> add)</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="paramLabel">Parameters:</span></dt> |
| <dd><code>info</code> - Aggregate context</dd> |
| <dd><code>add</code> - Add context</dd> |
| </dl> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="implementResult(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggResultContext)">implementResult</a></h3> |
| <div class="memberSignature"><span class="returnType"><a href="../../linq4j/tree/Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></span> <span class="memberName">implementResult</span>​(<span class="arguments"><a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info, |
| <a href="AggResultContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggResultContext</a> result)</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="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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