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 <h2 title="Class MulticastRelOptListener" class="title">Class 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="class or interface in java.lang">Object</a>
 implements <a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="interface in org.apache.calcite.plan">RelOptListener</a></pre>
 <div class="block">MulticastRelOptListener implements the <a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="interface in org.apache.calcite.plan"><code>RelOptListener</code></a> interface by
  forwarding events on to a collection of other listeners.</div>
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 <h3>Nested classes/interfaces inherited from interface&nbsp;org.apache.calcite.plan.<a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="interface in org.apache.calcite.plan">RelOptListener</a></h3>
 <code><a href="../../../../org/apache/calcite/plan/RelOptListener.RelChosenEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelChosenEvent</a>, <a href="../../../../org/apache/calcite/plan/RelOptListener.RelDiscardedEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelDiscardedEvent</a>, <a href="../../../../org/apache/calcite/plan/RelOptListener.RelEquivalenceEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelEquivalenceEvent</a>, <a href="../../../../org/apache/calcite/plan/RelOptListener.RelEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelEvent</a>, <a href="../../../../org/apache/calcite/plan/RelOptListener.RuleAttemptedEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RuleAttemptedEvent</a>, <a href="../../../../org/apache/calcite/plan/RelOptListener.RuleEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RuleEvent</a>, <a href="../../../../org/apache/calcite/plan/RelOptListener.RuleProductionEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RuleProductionEvent</a></code></li>
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 <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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 <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="interface in org.apache.calcite.plan">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="class in org.apache.calcite.plan">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="class in org.apache.calcite.plan">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="class in org.apache.calcite.plan">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="class in org.apache.calcite.plan">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="class in org.apache.calcite.plan">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>Constructor Detail</h3>
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 <h4>MulticastRelOptListener</h4>
 <pre>public&nbsp;MulticastRelOptListener()</pre>
 <div class="block">Creates a new empty multicast listener.</div>
 </li>
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 <h4>addListener</h4>
 <pre>public&nbsp;void&nbsp;addListener(<a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="interface in org.apache.calcite.plan">RelOptListener</a>&nbsp;listener)</pre>
 <div class="block">Adds a listener which will receive multicast events.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>listener</code> - listener to add</dd>
 </dl>
 </li>
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 <h4>relEquivalenceFound</h4>
 <pre>public&nbsp;void&nbsp;relEquivalenceFound(<a href="../../../../org/apache/calcite/plan/RelOptListener.RelEquivalenceEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelEquivalenceEvent</a>&nbsp;event)</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&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">Specified by:</span></dt>
 <dd><code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#relEquivalenceFound-org.apache.calcite.plan.RelOptListener.RelEquivalenceEvent-">relEquivalenceFound</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="interface in org.apache.calcite.plan">RelOptListener</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>event</code> - details about the event</dd>
 </dl>
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 <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="class in org.apache.calcite.plan">RelOptListener.RuleAttemptedEvent</a>&nbsp;event)</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&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">Specified by:</span></dt>
 <dd><code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#ruleAttempted-org.apache.calcite.plan.RelOptListener.RuleAttemptedEvent-">ruleAttempted</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="interface in org.apache.calcite.plan">RelOptListener</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>event</code> - details about the event</dd>
 </dl>
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 <pre>public&nbsp;void&nbsp;ruleProductionSucceeded(<a href="../../../../org/apache/calcite/plan/RelOptListener.RuleProductionEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RuleProductionEvent</a>&nbsp;event)</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&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">Specified by:</span></dt>
 <dd><code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#ruleProductionSucceeded-org.apache.calcite.plan.RelOptListener.RuleProductionEvent-">ruleProductionSucceeded</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="interface in org.apache.calcite.plan">RelOptListener</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>event</code> - details about the event</dd>
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 <h4>relChosen</h4>
 <pre>public&nbsp;void&nbsp;relChosen(<a href="../../../../org/apache/calcite/plan/RelOptListener.RelChosenEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelChosenEvent</a>&nbsp;event)</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&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">Specified by:</span></dt>
 <dd><code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#relChosen-org.apache.calcite.plan.RelOptListener.RelChosenEvent-">relChosen</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="interface in org.apache.calcite.plan">RelOptListener</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>event</code> - details about the event</dd>
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 <h4>relDiscarded</h4>
 <pre>public&nbsp;void&nbsp;relDiscarded(<a href="../../../../org/apache/calcite/plan/RelOptListener.RelDiscardedEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelDiscardedEvent</a>&nbsp;event)</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&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">Specified by:</span></dt>
 <dd><code><a href="../../../../org/apache/calcite/plan/RelOptListener.html#relDiscarded-org.apache.calcite.plan.RelOptListener.RelDiscardedEvent-">relDiscarded</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/calcite/plan/RelOptListener.html" title="interface in org.apache.calcite.plan">RelOptListener</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>event</code> - details about the event</dd>
 </dl>
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