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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.calcite.rel.rules</a></div> |
| <h1 title="Class LoptSemiJoinOptimizer" class="title">Class LoptSemiJoinOptimizer</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance">org.apache.calcite.rel.rules.LoptSemiJoinOptimizer</div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">LoptSemiJoinOptimizer</span> |
| <span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div> |
| <div class="block">Implements the logic for determining the optimal |
| semi-joins to be used in processing joins in a query.</div> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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| <section class="constructor-summary" id="constructor-summary"> |
| <h2>Constructor Summary</h2> |
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| <div class="table-header col-first">Constructor</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(org.apache.calcite.rel.metadata.RelMetadataQuery,org.apache.calcite.rel.rules.LoptMultiJoin,org.apache.calcite.rex.RexBuilder)" class="member-name-link">LoptSemiJoinOptimizer</a><wbr>(<a href="../metadata/RelMetadataQuery.html" title="class in org.apache.calcite.rel.metadata">RelMetadataQuery</a> mq, |
| <a href="LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin, |
| <a href="../../rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a> rexBuilder)</code></div> |
| <div class="col-last even-row-color"> </div> |
| </div> |
| </section> |
| </li> |
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| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
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| <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-tab4"><code>boolean</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#chooseBestSemiJoin(org.apache.calcite.rel.rules.LoptMultiJoin)" class="member-name-link">chooseBestSemiJoin</a><wbr>(<a href="LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Finds the optimal semijoin for filtering the least costly fact table from |
| among the remaining possible semijoins to choose from.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getChosenSemiJoin(int)" class="member-name-link">getChosenSemiJoin</a><wbr>(int factIdx)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Returns the optimal semijoin for the specified factor; may be the factor |
| itself if semijoins are not chosen for the factor.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#makePossibleSemiJoins(org.apache.calcite.rel.rules.LoptMultiJoin)" class="member-name-link">makePossibleSemiJoins</a><wbr>(<a href="LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Determines all possible semijoins that can be used by dimension tables to |
| filter fact tables.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
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| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <li> |
| <section class="constructor-details" id="constructor-detail"> |
| <h2>Constructor Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="<init>(org.apache.calcite.rel.metadata.RelMetadataQuery,org.apache.calcite.rel.rules.LoptMultiJoin,org.apache.calcite.rex.RexBuilder)"> |
| <h3>LoptSemiJoinOptimizer</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="element-name">LoptSemiJoinOptimizer</span><wbr><span class="parameters">(<a href="../metadata/RelMetadataQuery.html" title="class in org.apache.calcite.rel.metadata">RelMetadataQuery</a> mq, |
| <a href="LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin, |
| <a href="../../rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a> rexBuilder)</span></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="makePossibleSemiJoins(org.apache.calcite.rel.rules.LoptMultiJoin)"> |
| <h3>makePossibleSemiJoins</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">void</span> <span class="element-name">makePossibleSemiJoins</span><wbr><span class="parameters">(<a href="LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin)</span></div> |
| <div class="block">Determines all possible semijoins that can be used by dimension tables to |
| filter fact tables. Constructs SemiJoinRels corresponding to potential |
| dimension table filters and stores them in the member field |
| "possibleSemiJoins"</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>multiJoin</code> - join factors being optimized</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="chooseBestSemiJoin(org.apache.calcite.rel.rules.LoptMultiJoin)"> |
| <h3>chooseBestSemiJoin</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">boolean</span> <span class="element-name">chooseBestSemiJoin</span><wbr><span class="parameters">(<a href="LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin)</span></div> |
| <div class="block">Finds the optimal semijoin for filtering the least costly fact table from |
| among the remaining possible semijoins to choose from. The chosen |
| semijoin is stored in the chosenSemiJoins array</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>multiJoin</code> - join factors being optimized</dd> |
| <dt>Returns:</dt> |
| <dd>true if a suitable semijoin is found; false otherwise</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getChosenSemiJoin(int)"> |
| <h3>getChosenSemiJoin</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></span> <span class="element-name">getChosenSemiJoin</span><wbr><span class="parameters">(int factIdx)</span></div> |
| <div class="block">Returns the optimal semijoin for the specified factor; may be the factor |
| itself if semijoins are not chosen for the factor.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>factIdx</code> - Index corresponding to the desired factor</dd> |
| </dl> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
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