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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.plan</a></div> |
| <h2 title="Interface RelOptListener" class="title">Interface RelOptListener</h2> |
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| <dd><code><a href="MulticastRelOptListener.html" title="class in org.apache.calcite.plan">MulticastRelOptListener</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public interface <span class="typeNameLabel">RelOptListener</span> |
| extends java.util.EventListener</pre> |
| <div class="block">RelOptListener defines an interface for listening to events which occur |
| during the optimization process.</div> |
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| <table class="memberSummary"> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Interface</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RelOptListener.RelChosenEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelChosenEvent</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Event indicating that a relational expression has been chosen.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RelOptListener.RelDiscardedEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelDiscardedEvent</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Event indicating that a relational expression has been discarded.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RelOptListener.RelEquivalenceEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelEquivalenceEvent</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Event indicating that a relational expression has been found to |
| be equivalent to an equivalence class.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RelOptListener.RelEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelEvent</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Event class for abstract event dealing with a relational expression.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RelOptListener.RuleAttemptedEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RuleAttemptedEvent</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Event indicating that a planner rule has been attempted.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RelOptListener.RuleEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RuleEvent</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Event indicating that a planner rule has fired.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RelOptListener.RuleProductionEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RuleProductionEvent</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Event indicating that a planner rule has produced a result.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#relChosen(org.apache.calcite.plan.RelOptListener.RelChosenEvent)">relChosen</a></span>​(<a href="RelOptListener.RelChosenEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelChosenEvent</a> event)</code></th> |
| <td class="colLast"> |
| <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="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#relDiscarded(org.apache.calcite.plan.RelOptListener.RelDiscardedEvent)">relDiscarded</a></span>​(<a href="RelOptListener.RelDiscardedEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelDiscardedEvent</a> event)</code></th> |
| <td class="colLast"> |
| <div class="block">Notifies this listener that a relational expression is no longer of |
| interest to the planner.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#relEquivalenceFound(org.apache.calcite.plan.RelOptListener.RelEquivalenceEvent)">relEquivalenceFound</a></span>​(<a href="RelOptListener.RelEquivalenceEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelEquivalenceEvent</a> event)</code></th> |
| <td class="colLast"> |
| <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="i3" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#ruleAttempted(org.apache.calcite.plan.RelOptListener.RuleAttemptedEvent)">ruleAttempted</a></span>​(<a href="RelOptListener.RuleAttemptedEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RuleAttemptedEvent</a> event)</code></th> |
| <td class="colLast"> |
| <div class="block">Notifies this listener that an optimizer rule is being applied to a |
| particular relational expression.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#ruleProductionSucceeded(org.apache.calcite.plan.RelOptListener.RuleProductionEvent)">ruleProductionSucceeded</a></span>​(<a href="RelOptListener.RuleProductionEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RuleProductionEvent</a> event)</code></th> |
| <td class="colLast"> |
| <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> |
| </td> |
| </tr> |
| </table> |
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| <h3>Method Detail</h3> |
| <a id="relEquivalenceFound(org.apache.calcite.plan.RelOptListener.RelEquivalenceEvent)"> |
| <!-- --> |
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| <h4>relEquivalenceFound</h4> |
| <pre class="methodSignature">void relEquivalenceFound​(<a href="RelOptListener.RelEquivalenceEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelEquivalenceEvent</a> event)</pre> |
| <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="paramLabel">Parameters:</span></dt> |
| <dd><code>event</code> - details about the event</dd> |
| </dl> |
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| <h4>ruleAttempted</h4> |
| <pre class="methodSignature">void ruleAttempted​(<a href="RelOptListener.RuleAttemptedEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RuleAttemptedEvent</a> event)</pre> |
| <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="paramLabel">Parameters:</span></dt> |
| <dd><code>event</code> - details about the event</dd> |
| </dl> |
| </li> |
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| <h4>ruleProductionSucceeded</h4> |
| <pre class="methodSignature">void ruleProductionSucceeded​(<a href="RelOptListener.RuleProductionEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RuleProductionEvent</a> event)</pre> |
| <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="paramLabel">Parameters:</span></dt> |
| <dd><code>event</code> - details about the event</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>relDiscarded</h4> |
| <pre class="methodSignature">void relDiscarded​(<a href="RelOptListener.RelDiscardedEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelDiscardedEvent</a> event)</pre> |
| <div class="block">Notifies this listener that a relational expression is no longer of |
| interest to the planner.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>event</code> - details about the event</dd> |
| </dl> |
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| <h4>relChosen</h4> |
| <pre class="methodSignature">void relChosen​(<a href="RelOptListener.RelChosenEvent.html" title="class in org.apache.calcite.plan">RelOptListener.RelChosenEvent</a> event)</pre> |
| <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="paramLabel">Parameters:</span></dt> |
| <dd><code>event</code> - details about the event</dd> |
| </dl> |
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