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<div class="subTitle">org.apache.calcite.rel.core</div>
<h2 title="类 RepeatUnion" class="title">类 RepeatUnion</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li><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">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html" title="org.apache.calcite.rel中的类">org.apache.calcite.rel.AbstractRelNode</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/calcite/rel/BiRel.html" title="org.apache.calcite.rel中的类">org.apache.calcite.rel.BiRel</a></li>
<li>
<ul class="inheritance">
<li>org.apache.calcite.rel.core.RepeatUnion</li>
</ul>
</li>
</ul>
</li>
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<div class="description">
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<dl>
<dt>所有已实现的接口:</dt>
<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Cloneable.html?is-external=true" title="java.lang中的类或接口">Cloneable</a>, <a href="../../../../../org/apache/calcite/plan/RelOptNode.html" title="org.apache.calcite.plan中的接口">RelOptNode</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a></dd>
</dl>
<dl>
<dt>直接已知子类:</dt>
<dd><a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableRepeatUnion.html" title="org.apache.calcite.adapter.enumerable中的类">EnumerableRepeatUnion</a>, <a href="../../../../../org/apache/calcite/rel/logical/LogicalRepeatUnion.html" title="org.apache.calcite.rel.logical中的类">LogicalRepeatUnion</a></dd>
</dl>
<hr>
<br>
<pre>public abstract class <span class="typeNameLabel">RepeatUnion</span>
extends <a href="../../../../../org/apache/calcite/rel/BiRel.html" title="org.apache.calcite.rel中的类">BiRel</a></pre>
<div class="block">Relational expression that computes a repeat union (recursive union in SQL
terminology).
<p>This operation is executed as follows:
<ul>
<li>Evaluate the left input (i.e., seed relational expression) once. For
UNION (but not UNION ALL), discard duplicated rows.
<li>Evaluate the right input (i.e., iterative relational expression) over and
over until it produces no more results (or until an optional maximum number
of iterations is reached). For UNION (but not UNION ALL), discard
duplicated results.
</ul>
<p>NOTE: The current API is experimental and subject to change without
notice.</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.rel.<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a></h3>
<code><a href="../../../../../org/apache/calcite/rel/RelNode.Context.html" title="org.apache.calcite.rel中的接口">RelNode.Context</a></code></li>
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<h3>字段概要</h3>
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<caption><span>字段</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">限定符和类型</th>
<th class="colLast" scope="col">字段和说明</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/core/RepeatUnion.html#all">all</a></span></code>
<div class="block">Whether duplicates are considered.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/core/RepeatUnion.html#iterationLimit">iterationLimit</a></span></code>
<div class="block">Maximum number of times to repeat the iterative relational expression;
negative value means no limit, 0 means only seed will be evaluated</div>
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<h3>从类继承的字段&nbsp;org.apache.calcite.rel.<a href="../../../../../org/apache/calcite/rel/BiRel.html" title="org.apache.calcite.rel中的类">BiRel</a></h3>
<code><a href="../../../../../org/apache/calcite/rel/BiRel.html#left">left</a>, <a href="../../../../../org/apache/calcite/rel/BiRel.html#right">right</a></code></li>
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<code><a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#digest">digest</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#id">id</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#rowType">rowType</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#traitSet">traitSet</a></code></li>
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<h3>构造器概要</h3>
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<caption><span>构造器</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">限定符</th>
<th class="colLast" scope="col">构造器和说明</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/core/RepeatUnion.html#RepeatUnion-org.apache.calcite.plan.RelOptCluster-org.apache.calcite.plan.RelTraitSet-org.apache.calcite.rel.RelNode-org.apache.calcite.rel.RelNode-boolean-int-">RepeatUnion</a></span>(<a href="../../../../../org/apache/calcite/plan/RelOptCluster.html" title="org.apache.calcite.plan中的类">RelOptCluster</a>&nbsp;cluster,
<a href="../../../../../org/apache/calcite/plan/RelTraitSet.html" title="org.apache.calcite.plan中的类">RelTraitSet</a>&nbsp;traitSet,
<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;seed,
<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;iterative,
boolean&nbsp;all,
int&nbsp;iterationLimit)</code>&nbsp;</td>
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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="t4" class="tableTab"><span><a href="javascript:show(8);">具体方法</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>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>protected <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/rel/core/RepeatUnion.html#deriveRowType--">deriveRowType</a></span>()</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/core/RepeatUnion.html#estimateRowCount-org.apache.calcite.rel.metadata.RelMetadataQuery-">estimateRowCount</a></span>(<a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQuery.html" title="org.apache.calcite.rel.metadata中的类">RelMetadataQuery</a>&nbsp;mq)</code>
<div class="block">Returns an estimate of the number of rows this relational expression will
return.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/rel/RelWriter.html" title="org.apache.calcite.rel中的接口">RelWriter</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/core/RepeatUnion.html#explainTerms-org.apache.calcite.rel.RelWriter-">explainTerms</a></span>(<a href="../../../../../org/apache/calcite/rel/RelWriter.html" title="org.apache.calcite.rel中的接口">RelWriter</a>&nbsp;pw)</code>
<div class="block">Describes the inputs and attributes of this relational expression.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/core/RepeatUnion.html#getIterativeRel--">getIterativeRel</a></span>()</code>&nbsp;</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/core/RepeatUnion.html#getSeedRel--">getSeedRel</a></span>()</code>&nbsp;</td>
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<code><a href="../../../../../org/apache/calcite/rel/BiRel.html#childrenAccept-org.apache.calcite.rel.RelVisitor-">childrenAccept</a>, <a href="../../../../../org/apache/calcite/rel/BiRel.html#getInputs--">getInputs</a>, <a href="../../../../../org/apache/calcite/rel/BiRel.html#getLeft--">getLeft</a>, <a href="../../../../../org/apache/calcite/rel/BiRel.html#getRight--">getRight</a>, <a href="../../../../../org/apache/calcite/rel/BiRel.html#replaceInput-int-org.apache.calcite.rel.RelNode-">replaceInput</a></code></li>
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<code><a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#accept-org.apache.calcite.rel.RelShuttle-">accept</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#accept-org.apache.calcite.rex.RexShuttle-">accept</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#collectVariablesSet-java.util.Set-">collectVariablesSet</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#collectVariablesUsed-java.util.Set-">collectVariablesUsed</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#computeDigest--">computeDigest</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#computeSelfCost-org.apache.calcite.plan.RelOptPlanner-">computeSelfCost</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#computeSelfCost-org.apache.calcite.plan.RelOptPlanner-org.apache.calcite.rel.metadata.RelMetadataQuery-">computeSelfCost</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#copy-org.apache.calcite.plan.RelTraitSet-java.util.List-">copy</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#equals-java.lang.Object-">equals</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#explain-org.apache.calcite.rel.RelWriter-">explain</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getChildExps--">getChildExps</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getCluster--">getCluster</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getCollationList--">getCollationList</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getConvention--">getConvention</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getCorrelVariable--">getCorrelVariable</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getDescription--">getDescription</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getDigest--">getDigest</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getExpectedInputRowType-int-">getExpectedInputRowType</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getId--">getId</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getInput-int-">getInput</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getQuery--">getQuery</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getRelTypeName--">getRelTypeName</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getRows--">getRows</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getRowType--">getRowType</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getTable--">getTable</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getTraitSet--">getTraitSet</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getVariablesSet--">getVariablesSet</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#getVariablesStopped--">getVariablesStopped</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#hashCode--">hashCode</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#isDistinct--">isDistinct</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#isKey-org.apache.calcite.util.ImmutableBitSet-">isKey</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#isValid-boolean-">isValid</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#isValid-org.apache.calcite.util.Litmus-org.apache.calcite.rel.RelNode.Context-">isValid</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#metadata-java.lang.Class-org.apache.calcite.rel.metadata.RelMetadataQuery-">metadata</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#onRegister-org.apache.calcite.plan.RelOptPlanner-">onRegister</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#recomputeDigest--">recomputeDigest</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#register-org.apache.calcite.plan.RelOptPlanner-">register</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#sole-java.util.List-">sole</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#toString--">toString</a></code></li>
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<h3>从类继承的方法&nbsp;java.lang.<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></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="java.lang中的类或接口">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="java.lang中的类或接口">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="java.lang中的类或接口">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="java.lang中的类或接口">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="java.lang中的类或接口">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="java.lang中的类或接口">wait</a></code></li>
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<h4>all</h4>
<pre>public final&nbsp;boolean all</pre>
<div class="block">Whether duplicates are considered.</div>
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<h4>iterationLimit</h4>
<pre>public final&nbsp;int iterationLimit</pre>
<div class="block">Maximum number of times to repeat the iterative relational expression;
negative value means no limit, 0 means only seed will be evaluated</div>
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<h3>构造器详细资料</h3>
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<h4>RepeatUnion</h4>
<pre>protected&nbsp;RepeatUnion(<a href="../../../../../org/apache/calcite/plan/RelOptCluster.html" title="org.apache.calcite.plan中的类">RelOptCluster</a>&nbsp;cluster,
<a href="../../../../../org/apache/calcite/plan/RelTraitSet.html" title="org.apache.calcite.plan中的类">RelTraitSet</a>&nbsp;traitSet,
<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;seed,
<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;iterative,
boolean&nbsp;all,
int&nbsp;iterationLimit)</pre>
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<h3>方法详细资料</h3>
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<h4>estimateRowCount</h4>
<pre>public&nbsp;double&nbsp;estimateRowCount(<a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQuery.html" title="org.apache.calcite.rel.metadata中的类">RelMetadataQuery</a>&nbsp;mq)</pre>
<div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/rel/RelNode.html#estimateRowCount-org.apache.calcite.rel.metadata.RelMetadataQuery-">RelNode</a></code></span></div>
<div class="block">Returns an estimate of the number of rows this relational expression will
return.
<p>NOTE jvs 29-Mar-2006: Don't call this method directly. Instead, use
<a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQuery.html#getRowCount-org.apache.calcite.rel.RelNode-"><code>RelMetadataQuery.getRowCount(org.apache.calcite.rel.RelNode)</code></a>, which gives plugins a chance to
override the rel's default ideas about row count.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/RelNode.html#estimateRowCount-org.apache.calcite.rel.metadata.RelMetadataQuery-">estimateRowCount</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a></code></dd>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#estimateRowCount-org.apache.calcite.rel.metadata.RelMetadataQuery-">estimateRowCount</a></code>&nbsp;在类中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html" title="org.apache.calcite.rel中的类">AbstractRelNode</a></code></dd>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>mq</code> - Metadata query</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>Estimate of the number of rows this relational expression will
return</dd>
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<h4>explainTerms</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/RelWriter.html" title="org.apache.calcite.rel中的接口">RelWriter</a>&nbsp;explainTerms(<a href="../../../../../org/apache/calcite/rel/RelWriter.html" title="org.apache.calcite.rel中的接口">RelWriter</a>&nbsp;pw)</pre>
<div class="block"><span class="descfrmTypeLabel">从类复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#explainTerms-org.apache.calcite.rel.RelWriter-">AbstractRelNode</a></code></span></div>
<div class="block">Describes the inputs and attributes of this relational expression.
Each node should call <code>super.explainTerms</code>, then call the
<a href="../../../../../org/apache/calcite/rel/RelWriter.html#input-java.lang.String-org.apache.calcite.rel.RelNode-"><code>RelWriter.input(String, RelNode)</code></a>
and
<a href="../../../../../org/apache/calcite/rel/externalize/RelWriterImpl.html#item-java.lang.String-java.lang.Object-"><code>RelWriterImpl.item(String, Object)</code></a>
methods for each input and attribute.</div>
<dl>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/BiRel.html#explainTerms-org.apache.calcite.rel.RelWriter-">explainTerms</a></code>&nbsp;在类中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/BiRel.html" title="org.apache.calcite.rel中的类">BiRel</a></code></dd>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>pw</code> - Plan writer</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>Plan writer for fluent-explain pattern</dd>
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<h4>getSeedRel</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;getSeedRel()</pre>
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<h4>getIterativeRel</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;getIterativeRel()</pre>
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<h4>deriveRowType</h4>
<pre>protected&nbsp;<a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;deriveRowType()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#deriveRowType--">deriveRowType</a></code>&nbsp;在类中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html" title="org.apache.calcite.rel中的类">AbstractRelNode</a></code></dd>
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