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 <pre>public class <span class="typeNameLabel">LoptSemiJoinOptimizer</span>
 extends <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">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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 <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.apache.calcite.rel.metadata.RelMetadataQuery,org.apache.calcite.rel.rules.LoptMultiJoin,org.apache.calcite.rex.RexBuilder)">LoptSemiJoinOptimizer</a></span>&#8203;(<a href="../metadata/RelMetadataQuery.html" title="class in org.apache.calcite.rel.metadata">RelMetadataQuery</a>&nbsp;mq,
 <a href="LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a>&nbsp;multiJoin,
 <a href="../../rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a>&nbsp;rexBuilder)</code></th>
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 <td class="colFirst"><code>boolean</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#chooseBestSemiJoin(org.apache.calcite.rel.rules.LoptMultiJoin)">chooseBestSemiJoin</a></span>&#8203;(<a href="LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a>&nbsp;multiJoin)</code></th>
 <td class="colLast">
 <div class="block">Finds the optimal semijoin for filtering the least costly fact table from
  among the remaining possible semijoins to choose from.</div>
 </td>
 </tr>
 <tr class="rowColor" id="i1">
 <td class="colFirst"><code><a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getChosenSemiJoin(int)">getChosenSemiJoin</a></span>&#8203;(int&nbsp;factIdx)</code></th>
 <td class="colLast">
 <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>
 </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="#makePossibleSemiJoins(org.apache.calcite.rel.rules.LoptMultiJoin)">makePossibleSemiJoins</a></span>&#8203;(<a href="LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a>&nbsp;multiJoin)</code></th>
 <td class="colLast">
 <div class="block">Determines all possible semijoins that can be used by dimension tables to
  filter fact tables.</div>
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 </tr>
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 <h3><a id="&lt;init&gt;(org.apache.calcite.rel.metadata.RelMetadataQuery,org.apache.calcite.rel.rules.LoptMultiJoin,org.apache.calcite.rex.RexBuilder)">LoptSemiJoinOptimizer</a></h3>
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 <a href="LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a>&nbsp;multiJoin,
 <a href="../../rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a>&nbsp;rexBuilder)</span></div>
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 <h3><a id="makePossibleSemiJoins(org.apache.calcite.rel.rules.LoptMultiJoin)">makePossibleSemiJoins</a></h3>
 <div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType">void</span>&nbsp;<span class="memberName">makePossibleSemiJoins</span>&#8203;(<span class="arguments"><a href="LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a>&nbsp;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>
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 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>multiJoin</code> - join factors being optimized</dd>
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 <h3><a id="chooseBestSemiJoin(org.apache.calcite.rel.rules.LoptMultiJoin)">chooseBestSemiJoin</a></h3>
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 <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">Parameters:</span></dt>
 <dd><code>multiJoin</code> - join factors being optimized</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>true if a suitable semijoin is found; false otherwise</dd>
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 <h3><a id="getChosenSemiJoin(int)">getChosenSemiJoin</a></h3>
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 <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>
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 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>factIdx</code> - Index corresponding to the desired factor</dd>
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	<pre>public class <span class="typeNameLabel">LoptSemiJoinOptimizer</span>
	extends <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">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>
	</section>
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	<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.apache.calcite.rel.metadata.RelMetadataQuery,org.apache.calcite.rel.rules.LoptMultiJoin,org.apache.calcite.rex.RexBuilder)">LoptSemiJoinOptimizer</a></span>(<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></th>
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	<td class="colFirst"><code>boolean</code></td>
	<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#chooseBestSemiJoin(org.apache.calcite.rel.rules.LoptMultiJoin)">chooseBestSemiJoin</a></span>(<a href="LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin)</code></th>
	<td class="colLast">
	<div class="block">Finds the optimal semijoin for filtering the least costly fact table from
	among the remaining possible semijoins to choose from.</div>
	</td>
	</tr>
	<tr class="rowColor" id="i1">
	<td class="colFirst"><code><a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></td>
	<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getChosenSemiJoin(int)">getChosenSemiJoin</a></span>(int factIdx)</code></th>
	<td class="colLast">
	<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>
	</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="#makePossibleSemiJoins(org.apache.calcite.rel.rules.LoptMultiJoin)">makePossibleSemiJoins</a></span>(<a href="LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin)</code></th>
	<td class="colLast">
	<div class="block">Determines all possible semijoins that can be used by dimension tables to
	filter fact tables.</div>
	</td>
	</tr>
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	<h3><a id="<init>(org.apache.calcite.rel.metadata.RelMetadataQuery,org.apache.calcite.rel.rules.LoptMultiJoin,org.apache.calcite.rex.RexBuilder)">LoptSemiJoinOptimizer</a></h3>
	<div class="memberSignature"><span class="modifiers">public</span> <span class="memberName">LoptSemiJoinOptimizer</span>(<span class="arguments"><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>
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	<h3><a id="makePossibleSemiJoins(org.apache.calcite.rel.rules.LoptMultiJoin)">makePossibleSemiJoins</a></h3>
	<div class="memberSignature"><span class="modifiers">public</span> <span class="returnType">void</span> <span class="memberName">makePossibleSemiJoins</span>(<span class="arguments"><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>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>multiJoin</code> - join factors being optimized</dd>
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	<h3><a id="chooseBestSemiJoin(org.apache.calcite.rel.rules.LoptMultiJoin)">chooseBestSemiJoin</a></h3>
	<div class="memberSignature"><span class="modifiers">public</span> <span class="returnType">boolean</span> <span class="memberName">chooseBestSemiJoin</span>(<span class="arguments"><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>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>multiJoin</code> - join factors being optimized</dd>
	<dt><span class="returnLabel">Returns:</span></dt>
	<dd>true if a suitable semijoin is found; false otherwise</dd>
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	<h3><a id="getChosenSemiJoin(int)">getChosenSemiJoin</a></h3>
	<div class="memberSignature"><span class="modifiers">public</span> <span class="returnType"><a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></span> <span class="memberName">getChosenSemiJoin</span>(<span class="arguments">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>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>factIdx</code> - Index corresponding to the desired factor</dd>
	</dl>
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