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<div class="subTitle">org.apache.calcite.rel.rules</div>
<h2 title="类 LoptSemiJoinOptimizer" class="title">类 LoptSemiJoinOptimizer</h2>
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<pre>public class <span class="typeNameLabel">LoptSemiJoinOptimizer</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></pre>
<div class="block">Implements the logic for determining the optimal
semi-joins to be used in processing joins in a query.</div>
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<h3>构造器概要</h3>
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<th class="colOne" scope="col">构造器和说明</th>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/LoptSemiJoinOptimizer.html#LoptSemiJoinOptimizer-org.apache.calcite.rel.metadata.RelMetadataQuery-org.apache.calcite.rel.rules.LoptMultiJoin-org.apache.calcite.rex.RexBuilder-">LoptSemiJoinOptimizer</a></span>(<a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQuery.html" title="org.apache.calcite.rel.metadata中的类">RelMetadataQuery</a>&nbsp;mq,
<a href="../../../../../org/apache/calcite/rel/rules/LoptMultiJoin.html" title="org.apache.calcite.rel.rules中的类">LoptMultiJoin</a>&nbsp;multiJoin,
<a href="../../../../../org/apache/calcite/rex/RexBuilder.html" title="org.apache.calcite.rex中的类">RexBuilder</a>&nbsp;rexBuilder)</code>&nbsp;</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/LoptSemiJoinOptimizer.html#chooseBestSemiJoin-org.apache.calcite.rel.rules.LoptMultiJoin-">chooseBestSemiJoin</a></span>(<a href="../../../../../org/apache/calcite/rel/rules/LoptMultiJoin.html" title="org.apache.calcite.rel.rules中的类">LoptMultiJoin</a>&nbsp;multiJoin)</code>
<div class="block">Finds the optimal semijoin for filtering the least costly fact table from
among the remaining possible semijoins to choose from.</div>
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<td class="colFirst"><code><a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/LoptSemiJoinOptimizer.html#getChosenSemiJoin-int-">getChosenSemiJoin</a></span>(int&nbsp;factIdx)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/LoptSemiJoinOptimizer.html#makePossibleSemiJoins-org.apache.calcite.rel.rules.LoptMultiJoin-">makePossibleSemiJoins</a></span>(<a href="../../../../../org/apache/calcite/rel/rules/LoptMultiJoin.html" title="org.apache.calcite.rel.rules中的类">LoptMultiJoin</a>&nbsp;multiJoin)</code>
<div class="block">Determines all possible semijoins that can be used by dimension tables to
filter fact tables.</div>
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<h3>构造器详细资料</h3>
<a name="LoptSemiJoinOptimizer-org.apache.calcite.rel.metadata.RelMetadataQuery-org.apache.calcite.rel.rules.LoptMultiJoin-org.apache.calcite.rex.RexBuilder-">
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<h4>LoptSemiJoinOptimizer</h4>
<pre>public&nbsp;LoptSemiJoinOptimizer(<a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQuery.html" title="org.apache.calcite.rel.metadata中的类">RelMetadataQuery</a>&nbsp;mq,
<a href="../../../../../org/apache/calcite/rel/rules/LoptMultiJoin.html" title="org.apache.calcite.rel.rules中的类">LoptMultiJoin</a>&nbsp;multiJoin,
<a href="../../../../../org/apache/calcite/rex/RexBuilder.html" title="org.apache.calcite.rex中的类">RexBuilder</a>&nbsp;rexBuilder)</pre>
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<h3>方法详细资料</h3>
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<h4>makePossibleSemiJoins</h4>
<pre>public&nbsp;void&nbsp;makePossibleSemiJoins(<a href="../../../../../org/apache/calcite/rel/rules/LoptMultiJoin.html" title="org.apache.calcite.rel.rules中的类">LoptMultiJoin</a>&nbsp;multiJoin)</pre>
<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>
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<dt><span class="paramLabel">参数:</span></dt>
<dd><code>multiJoin</code> - join factors being optimized</dd>
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<h4>chooseBestSemiJoin</h4>
<pre>public&nbsp;boolean&nbsp;chooseBestSemiJoin(<a href="../../../../../org/apache/calcite/rel/rules/LoptMultiJoin.html" title="org.apache.calcite.rel.rules中的类">LoptMultiJoin</a>&nbsp;multiJoin)</pre>
<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>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>multiJoin</code> - join factors being optimized</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>true if a suitable semijoin is found; false otherwise</dd>
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<h4>getChosenSemiJoin</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;getChosenSemiJoin(int&nbsp;factIdx)</pre>
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<dt><span class="paramLabel">参数:</span></dt>
<dd><code>factIdx</code> - index corresponding to the desired factor</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>optimal semijoin for the specified factor; may be the factor
itself if semijoins are not chosen for the factor</dd>
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