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 <dt>所有已知子接口:</dt>
 <dd><a href="../../../../org/apache/calcite/interpreter/BindableRel.html" title="org.apache.calcite.interpreter中的接口">BindableRel</a>, <a href="../../../../org/apache/calcite/adapter/cassandra/CassandraRel.html" title="org.apache.calcite.adapter.cassandra中的接口">CassandraRel</a>, <a href="../../../../org/apache/calcite/rel/convert/Converter.html" title="org.apache.calcite.rel.convert中的接口">Converter</a>, <a href="../../../../org/apache/calcite/adapter/elasticsearch/ElasticsearchRel.html" title="org.apache.calcite.adapter.elasticsearch中的接口">ElasticsearchRel</a>, <a href="../../../../org/apache/calcite/adapter/enumerable/EnumerableRel.html" title="org.apache.calcite.adapter.enumerable中的接口">EnumerableRel</a>, <a href="../../../../org/apache/calcite/adapter/geode/rel/GeodeRel.html" title="org.apache.calcite.adapter.geode.rel中的接口">GeodeRel</a>, <a href="../../../../org/apache/calcite/interpreter/InterpretableRel.html" title="org.apache.calcite.interpreter中的接口">InterpretableRel</a>, <a href="../../../../org/apache/calcite/adapter/jdbc/JdbcRel.html" title="org.apache.calcite.adapter.jdbc中的接口">JdbcRel</a>, <a href="../../../../org/apache/calcite/adapter/mongodb/MongoRel.html" title="org.apache.calcite.adapter.mongodb中的接口">MongoRel</a>, <a href="../../../../org/apache/calcite/adapter/pig/PigRel.html" title="org.apache.calcite.adapter.pig中的接口">PigRel</a>, <a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>, <a href="../../../../org/apache/calcite/sql2rel/RelStructuredTypeFlattener.SelfFlatteningRel.html" title="org.apache.calcite.sql2rel中的接口">RelStructuredTypeFlattener.SelfFlatteningRel</a>, <a href="../../../../org/apache/calcite/adapter/spark/SparkRel.html" title="org.apache.calcite.adapter.spark中的接口">SparkRel</a></dd>
 </dl>
 <dl>
 <dt>所有已知实现类:</dt>
 <dd><a href="../../../../org/apache/calcite/plan/volcano/AbstractConverter.html" title="org.apache.calcite.plan.volcano中的类">AbstractConverter</a>, <a href="../../../../org/apache/calcite/rel/AbstractRelNode.html" title="org.apache.calcite.rel中的类">AbstractRelNode</a>, <a href="../../../../org/apache/calcite/rel/core/Aggregate.html" title="org.apache.calcite.rel.core中的类">Aggregate</a>, <a href="../../../../org/apache/calcite/interpreter/Bindables.BindableAggregate.html" title="org.apache.calcite.interpreter中的类">Bindables.BindableAggregate</a>, <a href="../../../../org/apache/calcite/interpreter/Bindables.BindableFilter.html" title="org.apache.calcite.interpreter中的类">Bindables.BindableFilter</a>, <a href="../../../../org/apache/calcite/interpreter/Bindables.BindableJoin.html" title="org.apache.calcite.interpreter中的类">Bindables.BindableJoin</a>, <a href="../../../../org/apache/calcite/interpreter/Bindables.BindableMatch.html" title="org.apache.calcite.interpreter中的类">Bindables.BindableMatch</a>, <a href="../../../../org/apache/calcite/interpreter/Bindables.BindableProject.html" title="org.apache.calcite.interpreter中的类">Bindables.BindableProject</a>, <a href="../../../../org/apache/calcite/interpreter/Bindables.BindableSort.html" title="org.apache.calcite.interpreter中的类">Bindables.BindableSort</a>, <a href="../../../../org/apache/calcite/interpreter/Bindables.BindableTableScan.html" title="org.apache.calcite.interpreter中的类">Bindables.BindableTableScan</a>, <a href="../../../../org/apache/calcite/interpreter/Bindables.BindableUnion.html" title="org.apache.calcite.interpreter中的类">Bindables.BindableUnion</a>, <a href="../../../../org/apache/calcite/interpreter/Bindables.BindableValues.html" title="org.apache.calcite.interpreter中的类">Bindables.BindableValues</a>, <a href="../../../../org/apache/calcite/interpreter/Bindables.BindableWindow.html" title="org.apache.calcite.interpreter中的类">Bindables.BindableWindow</a>, <a href="../../../../org/apache/calcite/rel/BiRel.html" title="org.apache.calcite.rel中的类">BiRel</a>, <a href="../../../../org/apache/calcite/rel/core/Calc.html" title="org.apache.calcite.rel.core中的类">Calc</a>, <a href="../../../../org/apache/calcite/adapter/cassandra/CassandraFilter.html" title="org.apache.calcite.adapter.cassandra中的类">CassandraFilter</a>, <a href="../../../../org/apache/calcite/adapter/cassandra/CassandraLimit.html" title="org.apache.calcite.adapter.cassandra中的类">CassandraLimit</a>, <a href="../../../../org/apache/calcite/adapter/cassandra/CassandraProject.html" title="org.apache.calcite.adapter.cassandra中的类">CassandraProject</a>, <a href="../../../../org/apache/calcite/adapter/cassandra/CassandraSort.html" title="org.apache.calcite.adapter.cassandra中的类">CassandraSort</a>, <a href="../../../../org/apache/calcite/adapter/cassandra/CassandraTableScan.html" 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 <hr>
 <br>
 <pre>public interface <span class="typeNameLabel">RelOptNode</span></pre>
 <div class="block">Node in a planner.</div>
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 <h3>方法概要</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="方法概要表, 列表方法和解释">
 <caption><span id="t0" class="activeTableTab"><span>所有方法</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">实例方法</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">抽象方法</a></span><span class="tabEnd">&nbsp;</span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">已过时的方法</a></span><span class="tabEnd">&nbsp;</span></span></caption>
 <tr>
 <th class="colFirst" scope="col">限定符和类型</th>
 <th class="colLast" scope="col">方法和说明</th>
 </tr>
 <tr id="i0" class="altColor">
 <td class="colFirst"><code><a href="../../../../org/apache/calcite/plan/RelOptCluster.html" title="org.apache.calcite.plan中的类">RelOptCluster</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptNode.html#getCluster--">getCluster</a></span>()</code>
 <div class="block">Returns the cluster this relational expression belongs to.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptNode.html#getDescription--">getDescription</a></span>()</code>
 <div class="block"><span class="deprecatedLabel">已过时。</span>&nbsp;</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptNode.html#getDigest--">getDigest</a></span>()</code>
 <div class="block">Returns a string which concisely describes the definition of this
  relational expression.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptNode.html#getId--">getId</a></span>()</code>
 <div class="block">Returns the ID of this relational expression, unique among all relational
  expressions created since the server was started.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;? extends <a href="../../../../org/apache/calcite/plan/RelOptNode.html" title="org.apache.calcite.plan中的接口">RelOptNode</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptNode.html#getInputs--">getInputs</a></span>()</code>
 <div class="block">Returns an array of this relational expression's inputs.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code><a href="../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptNode.html#getRowType--">getRowType</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code><a href="../../../../org/apache/calcite/plan/RelTraitSet.html" title="org.apache.calcite.plan中的类">RelTraitSet</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptNode.html#getTraitSet--">getTraitSet</a></span>()</code>
 <div class="block">Retrieves this RelNode's traits.</div>
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 </li>
 </ul>
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 <div class="details">
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 <h3>方法详细资料</h3>
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 <h4>getId</h4>
 <pre>int&nbsp;getId()</pre>
 <div class="block">Returns the ID of this relational expression, unique among all relational
  expressions created since the server was started.</div>
 <dl>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>Unique ID</dd>
 </dl>
 </li>
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 <a name="getDigest--">
 <!--   -->
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 <ul class="blockList">
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 <h4>getDigest</h4>
 <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>&nbsp;getDigest()</pre>
 <div class="block">Returns a string which concisely describes the definition of this
  relational expression. Two relational expressions are equivalent if
  their digests and <a href="../../../../org/apache/calcite/plan/RelOptNode.html#getRowType--"><code>getRowType()</code></a> are the same.

  <p>The digest does not contain the relational expression's identity --
  that would prevent similar relational expressions from ever comparing
  equal -- but does include the identity of children (on the assumption
  that children have already been normalized).

  <p>If you want a descriptive string which contains the identity, call
  <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="java.lang中的类或接口"><code>Object.toString()</code></a>, which always returns "rel#{id}:{digest}".</div>
 <dl>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>Digest of this <code>RelNode</code></dd>
 </dl>
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 <a name="getTraitSet--">
 <!--   -->
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 <h4>getTraitSet</h4>
 <pre><a href="../../../../org/apache/calcite/plan/RelTraitSet.html" title="org.apache.calcite.plan中的类">RelTraitSet</a>&nbsp;getTraitSet()</pre>
 <div class="block">Retrieves this RelNode's traits. Note that although the RelTraitSet
  returned is modifiable, it <b>must not</b> be modified during
  optimization. It is legal to modify the traits of a RelNode before or
  after optimization, although doing so could render a tree of RelNodes
  unimplementable. If a RelNode's traits need to be modified during
  optimization, clone the RelNode and change the clone's traits.</div>
 <dl>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>this RelNode's trait set</dd>
 </dl>
 </li>
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 <a name="getRowType--">
 <!--   -->
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 <ul class="blockList">
 <li class="blockList">
 <h4>getRowType</h4>
 <pre><a href="../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;getRowType()</pre>
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 <h4>getDescription</h4>
 <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="java.lang中的类或接口">@Deprecated</a>
 <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>&nbsp;getDescription()</pre>
 <div class="block"><span class="deprecatedLabel">已过时。</span>&nbsp;</div>
 <div class="block">Returns a string which describes the relational expression and, unlike
  <a href="../../../../org/apache/calcite/plan/RelOptNode.html#getDigest--"><code>getDigest()</code></a>, also includes the identity. Typically returns
  "rel#{id}:{digest}".</div>
 <dl>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>String which describes the relational expression and, unlike
    <a href="../../../../org/apache/calcite/plan/RelOptNode.html#getDigest--"><code>getDigest()</code></a>, also includes the identity</dd>
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 <a name="getInputs--">
 <!--   -->
 </a>
 <ul class="blockList">
 <li class="blockList">
 <h4>getInputs</h4>
 <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;? extends <a href="../../../../org/apache/calcite/plan/RelOptNode.html" title="org.apache.calcite.plan中的接口">RelOptNode</a>&gt;&nbsp;getInputs()</pre>
 <div class="block">Returns an array of this relational expression's inputs. If there are no
  inputs, returns an empty list, not <code>null</code>.</div>
 <dl>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>Array of this relational expression's inputs</dd>
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 </li>
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 <a name="getCluster--">
 <!--   -->
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 <ul class="blockListLast">
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 <h4>getCluster</h4>
 <pre><a href="../../../../org/apache/calcite/plan/RelOptCluster.html" title="org.apache.calcite.plan中的类">RelOptCluster</a>&nbsp;getCluster()</pre>
 <div class="block">Returns the cluster this relational expression belongs to.</div>
 <dl>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>cluster</dd>
 </dl>
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