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| <li>Summary: </li> |
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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.calcite.adapter.enumerable</a></div> |
| <h1 title="Interface AggImplementor" class="title">Interface AggImplementor</h1> |
| </div> |
| <section class="class-description" id="class-description"> |
| <dl class="notes"> |
| <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 class="notes"> |
| <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> |
| </dl> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public interface </span><span class="element-name type-name-label">AggImplementor</span></div> |
| <div class="block">Implements an aggregate function by generating expressions to |
| initialize, add to, and get a result from, an accumulator.</div> |
| <dl class="notes"> |
| <dt>See Also:</dt> |
| <dd> |
| <ul class="see-list"> |
| <li><a href="StrictAggImplementor.html" title="class in org.apache.calcite.adapter.enumerable"><code>StrictAggImplementor</code></a></li> |
| <li><a href="StrictWinAggImplementor.html" title="class in org.apache.calcite.adapter.enumerable"><code>StrictWinAggImplementor</code></a></li> |
| <li><code>RexImpTable.CountImplementor</code></li> |
| <li><code>RexImpTable.SumImplementor</code></li> |
| </ul> |
| </dd> |
| </dl> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
| <div id="method-summary-table"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab3" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab3', 3)" class="table-tab">Abstract Methods</button></div> |
| <div id="method-summary-table.tabpanel" role="tabpanel"> |
| <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0"> |
| <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><<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/reflect/Type.html" title="class or interface in java.lang.reflect" class="external-link">Type</a>></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getStateType(org.apache.calcite.adapter.enumerable.AggContext)" class="member-name-link">getStateType</a><wbr>(<a href="AggContext.html" title="interface in org.apache.calcite.adapter.enumerable">AggContext</a> info)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Returns the types of the intermediate variables used by the aggregate |
| implementation.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#implementAdd(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggAddContext)" class="member-name-link">implementAdd</a><wbr>(<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></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Updates intermediate values to account for the newly added value.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#implementReset(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggResetContext)" class="member-name-link">implementReset</a><wbr>(<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></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Implements reset of the intermediate variables to the initial state.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="../../linq4j/tree/Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#implementResult(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggResultContext)" class="member-name-link">implementResult</a><wbr>(<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></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Calculates the resulting value based on the intermediate variables.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="getStateType(org.apache.calcite.adapter.enumerable.AggContext)"> |
| <h3>getStateType</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><<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/reflect/Type.html" title="class or interface in java.lang.reflect" class="external-link">Type</a>></span> <span class="element-name">getStateType</span><wbr><span class="parameters">(<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/en/java/javase/17/docs/api/java.base/java/lang/StringBuilder.html" title="class or interface in java.lang" class="external-link"><code>StringBuilder</code></a>. |
| Calcite calls this method before all other <code>implement*</code> methods.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>info</code> - Aggregate context</dd> |
| <dt>Returns:</dt> |
| <dd>Types of the intermediate variables used by the aggregate |
| implementation</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="implementReset(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggResetContext)"> |
| <h3>implementReset</h3> |
| <div class="member-signature"><span class="return-type">void</span> <span class="element-name">implementReset</span><wbr><span class="parameters">(<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 class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>info</code> - Aggregate context</dd> |
| <dd><code>reset</code> - Reset context</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="implementAdd(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggAddContext)"> |
| <h3>implementAdd</h3> |
| <div class="member-signature"><span class="return-type">void</span> <span class="element-name">implementAdd</span><wbr><span class="parameters">(<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 class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>info</code> - Aggregate context</dd> |
| <dd><code>add</code> - Add context</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="implementResult(org.apache.calcite.adapter.enumerable.AggContext,org.apache.calcite.adapter.enumerable.AggResultContext)"> |
| <h3>implementResult</h3> |
| <div class="member-signature"><span class="return-type"><a href="../../linq4j/tree/Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></span> <span class="element-name">implementResult</span><wbr><span class="parameters">(<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 class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>info</code> - Aggregate context</dd> |
| <dd><code>result</code> - Result context</dd> |
| <dt>Returns:</dt> |
| <dd>Expression that is a result of calculating final value of |
| the aggregate being implemented</dd> |
| </dl> |
| </section> |
| </li> |
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| </li> |
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