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 <h2 title="类 MulticastRelOptListener" class="title">类 MulticastRelOptListener</h2>
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 <pre>public class <span class="typeNameLabel">MulticastRelOptListener</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>
 implements <a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="org.apache.calcite.plan中的接口">RelOptListener</a></pre>
 <div class="block">MulticastRelOptListener implements the <a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="org.apache.calcite.plan中的接口"><code>RelOptListener</code></a> interface by
  forwarding events on to a collection of other listeners.</div>
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 <h3>嵌套类概要</h3>
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 <h3>从接口继承的嵌套类/接口&nbsp;org.apache.calcite.plan.<a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="org.apache.calcite.plan中的接口">RelOptListener</a></h3>
 <code><a href="../../../../org/apache/calcite/plan/RelOptListener.RelChosenEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RelChosenEvent</a>, <a href="../../../../org/apache/calcite/plan/RelOptListener.RelDiscardedEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RelDiscardedEvent</a>, <a href="../../../../org/apache/calcite/plan/RelOptListener.RelEquivalenceEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RelEquivalenceEvent</a>, <a href="../../../../org/apache/calcite/plan/RelOptListener.RelEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RelEvent</a>, <a href="../../../../org/apache/calcite/plan/RelOptListener.RuleAttemptedEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RuleAttemptedEvent</a>, <a href="../../../../org/apache/calcite/plan/RelOptListener.RuleEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RuleEvent</a>, <a href="../../../../org/apache/calcite/plan/RelOptListener.RuleProductionEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RuleProductionEvent</a></code></li>
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 <th class="colOne" scope="col">构造器和说明</th>
 </tr>
 <tr class="altColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/MulticastRelOptListener.html#MulticastRelOptListener--">MulticastRelOptListener</a></span>()</code>
 <div class="block">Creates a new empty multicast listener.</div>
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 <tr id="i0" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/MulticastRelOptListener.html#addListener-org.apache.calcite.plan.RelOptListener-">addListener</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="org.apache.calcite.plan中的接口">RelOptListener</a>&nbsp;listener)</code>
 <div class="block">Adds a listener which will receive multicast events.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/MulticastRelOptListener.html#relChosen-org.apache.calcite.plan.RelOptListener.RelChosenEvent-">relChosen</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptListener.RelChosenEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RelChosenEvent</a>&nbsp;event)</code>
 <div class="block">Notifies this listener that a relational expression has been chosen as
  part of the final implementation of the query plan.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/MulticastRelOptListener.html#relDiscarded-org.apache.calcite.plan.RelOptListener.RelDiscardedEvent-">relDiscarded</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptListener.RelDiscardedEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RelDiscardedEvent</a>&nbsp;event)</code>
 <div class="block">Notifies this listener that a relational expression is no longer of
  interest to the planner.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/MulticastRelOptListener.html#relEquivalenceFound-org.apache.calcite.plan.RelOptListener.RelEquivalenceEvent-">relEquivalenceFound</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptListener.RelEquivalenceEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RelEquivalenceEvent</a>&nbsp;event)</code>
 <div class="block">Notifies this listener that a relational expression has been registered
  with a particular equivalence class after an equivalence has been either
  detected or asserted.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/MulticastRelOptListener.html#ruleAttempted-org.apache.calcite.plan.RelOptListener.RuleAttemptedEvent-">ruleAttempted</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptListener.RuleAttemptedEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RuleAttemptedEvent</a>&nbsp;event)</code>
 <div class="block">Notifies this listener that an optimizer rule is being applied to a
  particular relational expression.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/MulticastRelOptListener.html#ruleProductionSucceeded-org.apache.calcite.plan.RelOptListener.RuleProductionEvent-">ruleProductionSucceeded</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptListener.RuleProductionEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RuleProductionEvent</a>&nbsp;event)</code>
 <div class="block">Notifies this listener that an optimizer rule has been successfully
  applied to a particular relational expression, resulting in a new
  equivalent expression (relEquivalenceFound will also be called unless the
  new expression is identical to an existing one).</div>
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 <h3>构造器详细资料</h3>
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 <h4>MulticastRelOptListener</h4>
 <pre>public&nbsp;MulticastRelOptListener()</pre>
 <div class="block">Creates a new empty multicast listener.</div>
 </li>
 </ul>
 </li>
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 <h3>方法详细资料</h3>
 <a name="addListener-org.apache.calcite.plan.RelOptListener-">
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 <h4>addListener</h4>
 <pre>public&nbsp;void&nbsp;addListener(<a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="org.apache.calcite.plan中的接口">RelOptListener</a>&nbsp;listener)</pre>
 <div class="block">Adds a listener which will receive multicast events.</div>
 <dl>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>listener</code> - listener to add</dd>
 </dl>
 </li>
 </ul>
 <a name="relEquivalenceFound-org.apache.calcite.plan.RelOptListener.RelEquivalenceEvent-">
 <!--   -->
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 <h4>relEquivalenceFound</h4>
 <pre>public&nbsp;void&nbsp;relEquivalenceFound(<a href="../../../../org/apache/calcite/plan/RelOptListener.RelEquivalenceEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RelEquivalenceEvent</a>&nbsp;event)</pre>
 <div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#relEquivalenceFound-org.apache.calcite.plan.RelOptListener.RelEquivalenceEvent-">RelOptListener</a></code></span></div>
 <div class="block">Notifies this listener that a relational expression has been registered
  with a particular equivalence class after an equivalence has been either
  detected or asserted. Equivalence classes may be either logical (all
  expressions which yield the same result set) or physical (all expressions
  which yield the same result set with a particular calling convention).</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">指定者:</span></dt>
 <dd><code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#relEquivalenceFound-org.apache.calcite.plan.RelOptListener.RelEquivalenceEvent-">relEquivalenceFound</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="org.apache.calcite.plan中的接口">RelOptListener</a></code></dd>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>event</code> - details about the event</dd>
 </dl>
 </li>
 </ul>
 <a name="ruleAttempted-org.apache.calcite.plan.RelOptListener.RuleAttemptedEvent-">
 <!--   -->
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 <h4>ruleAttempted</h4>
 <pre>public&nbsp;void&nbsp;ruleAttempted(<a href="../../../../org/apache/calcite/plan/RelOptListener.RuleAttemptedEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RuleAttemptedEvent</a>&nbsp;event)</pre>
 <div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#ruleAttempted-org.apache.calcite.plan.RelOptListener.RuleAttemptedEvent-">RelOptListener</a></code></span></div>
 <div class="block">Notifies this listener that an optimizer rule is being applied to a
  particular relational expression. This rule is called twice; once before
  the rule is invoked, and once after. Note that the rel attribute of the
  event is always the old expression.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">指定者:</span></dt>
 <dd><code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#ruleAttempted-org.apache.calcite.plan.RelOptListener.RuleAttemptedEvent-">ruleAttempted</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="org.apache.calcite.plan中的接口">RelOptListener</a></code></dd>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>event</code> - details about the event</dd>
 </dl>
 </li>
 </ul>
 <a name="ruleProductionSucceeded-org.apache.calcite.plan.RelOptListener.RuleProductionEvent-">
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 <h4>ruleProductionSucceeded</h4>
 <pre>public&nbsp;void&nbsp;ruleProductionSucceeded(<a href="../../../../org/apache/calcite/plan/RelOptListener.RuleProductionEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RuleProductionEvent</a>&nbsp;event)</pre>
 <div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#ruleProductionSucceeded-org.apache.calcite.plan.RelOptListener.RuleProductionEvent-">RelOptListener</a></code></span></div>
 <div class="block">Notifies this listener that an optimizer rule has been successfully
  applied to a particular relational expression, resulting in a new
  equivalent expression (relEquivalenceFound will also be called unless the
  new expression is identical to an existing one). This rule is called
  twice; once before registration of the new rel, and once after. Note that
  the rel attribute of the event is always the new expression; to get the
  old expression, use event.getRuleCall().rels[0].</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">指定者:</span></dt>
 <dd><code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#ruleProductionSucceeded-org.apache.calcite.plan.RelOptListener.RuleProductionEvent-">ruleProductionSucceeded</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="org.apache.calcite.plan中的接口">RelOptListener</a></code></dd>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>event</code> - details about the event</dd>
 </dl>
 </li>
 </ul>
 <a name="relChosen-org.apache.calcite.plan.RelOptListener.RelChosenEvent-">
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 <h4>relChosen</h4>
 <pre>public&nbsp;void&nbsp;relChosen(<a href="../../../../org/apache/calcite/plan/RelOptListener.RelChosenEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RelChosenEvent</a>&nbsp;event)</pre>
 <div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#relChosen-org.apache.calcite.plan.RelOptListener.RelChosenEvent-">RelOptListener</a></code></span></div>
 <div class="block">Notifies this listener that a relational expression has been chosen as
  part of the final implementation of the query plan. After the plan is
  complete, this is called one more time with null for the rel.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">指定者:</span></dt>
 <dd><code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#relChosen-org.apache.calcite.plan.RelOptListener.RelChosenEvent-">relChosen</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="org.apache.calcite.plan中的接口">RelOptListener</a></code></dd>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>event</code> - details about the event</dd>
 </dl>
 </li>
 </ul>
 <a name="relDiscarded-org.apache.calcite.plan.RelOptListener.RelDiscardedEvent-">
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 <h4>relDiscarded</h4>
 <pre>public&nbsp;void&nbsp;relDiscarded(<a href="../../../../org/apache/calcite/plan/RelOptListener.RelDiscardedEvent.html" title="org.apache.calcite.plan中的类">RelOptListener.RelDiscardedEvent</a>&nbsp;event)</pre>
 <div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#relDiscarded-org.apache.calcite.plan.RelOptListener.RelDiscardedEvent-">RelOptListener</a></code></span></div>
 <div class="block">Notifies this listener that a relational expression is no longer of
  interest to the planner.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">指定者:</span></dt>
 <dd><code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#relDiscarded-org.apache.calcite.plan.RelOptListener.RelDiscardedEvent-">relDiscarded</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="org.apache.calcite.plan中的接口">RelOptListener</a></code></dd>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>event</code> - details about the event</dd>
 </dl>
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