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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.plan.volcano</a></div>
<h2 title="Class RelSet" class="title">Class RelSet</h2>
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<li>java.lang.Object</li>
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<li>org.apache.calcite.plan.volcano.RelSet</li>
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<pre>class <span class="typeNameLabel">RelSet</span>
extends java.lang.Object</pre>
<div class="block">A <code>RelSet</code> is an equivalence-set of expressions; that is, a set of
expressions which have identical semantics. We are generally interested in
using the expression which has the lowest cost.
<p>All of the expressions in an <code>RelSet</code> have the same calling
convention.</p></div>
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<h3>Field Summary</h3>
<table class="memberSummary">
<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Field</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) java.util.List&lt;<a href="AbstractConverter.html" title="class in org.apache.calcite.plan.volcano">AbstractConverter</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#abstractConverters">abstractConverters</a></span></code></th>
<td class="colLast">
<div class="block">List of <a href="AbstractConverter.html" title="class in org.apache.calcite.plan.volcano"><code>AbstractConverter</code></a> objects which have not yet been
satisfied.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) <a href="RelSet.html" title="class in org.apache.calcite.plan.volcano">RelSet</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#equivalentSet">equivalentSet</a></span></code></th>
<td class="colLast">
<div class="block">Set to the superseding set when this is found to be equivalent to another
set.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#id">id</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#inMetadataQuery">inMetadataQuery</a></span></code></th>
<td class="colLast">
<div class="block">Reentrancy flag.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private static org.slf4j.Logger</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#LOGGER">LOGGER</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) java.util.List&lt;<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#parents">parents</a></span></code></th>
<td class="colLast">
<div class="block">Relational expressions that have a subset in this set as a child.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) <a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#rel">rel</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) java.util.List&lt;<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#rels">rels</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) java.util.List&lt;<a href="RelSubset.html" title="class in org.apache.calcite.plan.volcano">RelSubset</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#subsets">subsets</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) java.util.Set&lt;<a href="../../rel/core/CorrelationId.html" title="class in org.apache.calcite.rel.core">CorrelationId</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#variablesPropagated">variablesPropagated</a></span></code></th>
<td class="colLast">
<div class="block">Variables that are set by relational expressions in this set
and available for use by parent and child expressions.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) java.util.Set&lt;<a href="../../rel/core/CorrelationId.html" title="class in org.apache.calcite.rel.core">CorrelationId</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#variablesUsed">variablesUsed</a></span></code></th>
<td class="colLast">
<div class="block">Variables that are used by relational expressions in this set.</div>
</td>
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<th class="colFirst" scope="col">Constructor</th>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(int,java.util.Set,java.util.Set)">RelSet</a></span>&#8203;(int&nbsp;id,
java.util.Set&lt;<a href="../../rel/core/CorrelationId.html" title="class in org.apache.calcite.rel.core">CorrelationId</a>&gt;&nbsp;variablesPropagated,
java.util.Set&lt;<a href="../../rel/core/CorrelationId.html" title="class in org.apache.calcite.rel.core">CorrelationId</a>&gt;&nbsp;variablesUsed)</code></th>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="RelSubset.html" title="class in org.apache.calcite.plan.volcano">RelSubset</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#add(org.apache.calcite.rel.RelNode)">add</a></span>&#8203;(<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel)</code></th>
<td class="colLast">
<div class="block">Adds a relational expression to a set, with its results available under a
particular calling convention.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>private void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#addAbstractConverters(org.apache.calcite.plan.volcano.VolcanoPlanner,org.apache.calcite.plan.RelOptCluster,org.apache.calcite.plan.volcano.RelSubset,boolean)">addAbstractConverters</a></span>&#8203;(<a href="VolcanoPlanner.html" title="class in org.apache.calcite.plan.volcano">VolcanoPlanner</a>&nbsp;planner,
<a href="../RelOptCluster.html" title="class in org.apache.calcite.plan">RelOptCluster</a>&nbsp;cluster,
<a href="RelSubset.html" title="class in org.apache.calcite.plan.volcano">RelSubset</a>&nbsp;subset,
boolean&nbsp;subsetToOthers)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>(package private) void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#addInternal(org.apache.calcite.rel.RelNode)">addInternal</a></span>&#8203;(<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel)</code></th>
<td class="colLast">
<div class="block">Adds an expression <code>rel</code> to this set, without creating a
<a href="RelSubset.html" title="class in org.apache.calcite.plan.volcano"><code>RelSubset</code></a>.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>(package private) <a href="RelSubset.html" title="class in org.apache.calcite.plan.volcano">RelSubset</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getOrCreateSubset(org.apache.calcite.plan.RelOptCluster,org.apache.calcite.plan.RelTraitSet)">getOrCreateSubset</a></span>&#8203;(<a href="../RelOptCluster.html" title="class in org.apache.calcite.plan">RelOptCluster</a>&nbsp;cluster,
<a href="../RelTraitSet.html" title="class in org.apache.calcite.plan">RelTraitSet</a>&nbsp;traits)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>java.util.List&lt;<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getParentRels()">getParentRels</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns all of the <a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a>s which reference <a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a>s in
this set.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>java.util.List&lt;<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getRelsFromAllSubsets()">getRelsFromAllSubsets</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="RelSubset.html" title="class in org.apache.calcite.plan.volcano">RelSubset</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSubset(org.apache.calcite.plan.RelTraitSet)">getSubset</a></span>&#8203;(<a href="../RelTraitSet.html" title="class in org.apache.calcite.plan">RelTraitSet</a>&nbsp;traits)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>(package private) void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#mergeWith(org.apache.calcite.plan.volcano.VolcanoPlanner,org.apache.calcite.plan.volcano.RelSet)">mergeWith</a></span>&#8203;(<a href="VolcanoPlanner.html" title="class in org.apache.calcite.plan.volcano">VolcanoPlanner</a>&nbsp;planner,
<a href="RelSet.html" title="class in org.apache.calcite.plan.volcano">RelSet</a>&nbsp;otherSet)</code></th>
<td class="colLast">
<div class="block">Merges <code>otherSet</code> into this RelSet.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>(package private) void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#obliterateRelNode(org.apache.calcite.rel.RelNode)">obliterateRelNode</a></span>&#8203;(<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel)</code></th>
<td class="colLast">
<div class="block">Removes all references to a specific <a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a> in both the subsets
and their parent relationships.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>private void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#postEquivalenceEvent(org.apache.calcite.plan.volcano.VolcanoPlanner,org.apache.calcite.rel.RelNode)">postEquivalenceEvent</a></span>&#8203;(<a href="VolcanoPlanner.html" title="class in org.apache.calcite.plan.volcano">VolcanoPlanner</a>&nbsp;planner,
<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel)</code></th>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h3>Field Detail</h3>
<a id="LOGGER">
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<h4>LOGGER</h4>
<pre>private static final&nbsp;org.slf4j.Logger LOGGER</pre>
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<h4>rels</h4>
<pre>final&nbsp;java.util.List&lt;<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt; rels</pre>
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<h4>parents</h4>
<pre>final&nbsp;java.util.List&lt;<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt; parents</pre>
<div class="block">Relational expressions that have a subset in this set as a child. This
is a multi-set. If multiple relational expressions in this set have the
same parent, there will be multiple entries.</div>
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<a id="subsets">
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<h4>subsets</h4>
<pre>final&nbsp;java.util.List&lt;<a href="RelSubset.html" title="class in org.apache.calcite.plan.volcano">RelSubset</a>&gt; subsets</pre>
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<h4>abstractConverters</h4>
<pre>final&nbsp;java.util.List&lt;<a href="AbstractConverter.html" title="class in org.apache.calcite.plan.volcano">AbstractConverter</a>&gt; abstractConverters</pre>
<div class="block">List of <a href="AbstractConverter.html" title="class in org.apache.calcite.plan.volcano"><code>AbstractConverter</code></a> objects which have not yet been
satisfied.</div>
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<a id="equivalentSet">
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<h4>equivalentSet</h4>
<pre><a href="RelSet.html" title="class in org.apache.calcite.plan.volcano">RelSet</a> equivalentSet</pre>
<div class="block">Set to the superseding set when this is found to be equivalent to another
set.</div>
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<h4>rel</h4>
<pre><a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel</pre>
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<h4>variablesPropagated</h4>
<pre>final&nbsp;java.util.Set&lt;<a href="../../rel/core/CorrelationId.html" title="class in org.apache.calcite.rel.core">CorrelationId</a>&gt; variablesPropagated</pre>
<div class="block">Variables that are set by relational expressions in this set
and available for use by parent and child expressions.</div>
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<a id="variablesUsed">
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<h4>variablesUsed</h4>
<pre>final&nbsp;java.util.Set&lt;<a href="../../rel/core/CorrelationId.html" title="class in org.apache.calcite.rel.core">CorrelationId</a>&gt; variablesUsed</pre>
<div class="block">Variables that are used by relational expressions in this set.</div>
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<h4>id</h4>
<pre>final&nbsp;int id</pre>
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<h4>inMetadataQuery</h4>
<pre>boolean inMetadataQuery</pre>
<div class="block">Reentrancy flag.</div>
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<h4>RelSet</h4>
<pre>RelSet&#8203;(int&nbsp;id,
java.util.Set&lt;<a href="../../rel/core/CorrelationId.html" title="class in org.apache.calcite.rel.core">CorrelationId</a>&gt;&nbsp;variablesPropagated,
java.util.Set&lt;<a href="../../rel/core/CorrelationId.html" title="class in org.apache.calcite.rel.core">CorrelationId</a>&gt;&nbsp;variablesUsed)</pre>
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<a id="getParentRels()">
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<h4>getParentRels</h4>
<pre class="methodSignature">public&nbsp;java.util.List&lt;<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;getParentRels()</pre>
<div class="block">Returns all of the <a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a>s which reference <a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a>s in
this set.</div>
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<h4>getRelsFromAllSubsets</h4>
<pre class="methodSignature">public&nbsp;java.util.List&lt;<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;getRelsFromAllSubsets()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>all of the <a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a>s contained by any subset of this set
(does not include the subset objects themselves)</dd>
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<h4>getSubset</h4>
<pre class="methodSignature">public&nbsp;<a href="RelSubset.html" title="class in org.apache.calcite.plan.volcano">RelSubset</a>&nbsp;getSubset&#8203;(<a href="../RelTraitSet.html" title="class in org.apache.calcite.plan">RelTraitSet</a>&nbsp;traits)</pre>
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<a id="obliterateRelNode(org.apache.calcite.rel.RelNode)">
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<h4>obliterateRelNode</h4>
<pre class="methodSignature">void&nbsp;obliterateRelNode&#8203;(<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel)</pre>
<div class="block">Removes all references to a specific <a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a> in both the subsets
and their parent relationships.</div>
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<a id="add(org.apache.calcite.rel.RelNode)">
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<h4>add</h4>
<pre class="methodSignature">public&nbsp;<a href="RelSubset.html" title="class in org.apache.calcite.plan.volcano">RelSubset</a>&nbsp;add&#8203;(<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel)</pre>
<div class="block">Adds a relational expression to a set, with its results available under a
particular calling convention. An expression may be in the set several
times with different calling conventions (and hence different costs).</div>
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<a id="addAbstractConverters(org.apache.calcite.plan.volcano.VolcanoPlanner,org.apache.calcite.plan.RelOptCluster,org.apache.calcite.plan.volcano.RelSubset,boolean)">
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<h4>addAbstractConverters</h4>
<pre class="methodSignature">private&nbsp;void&nbsp;addAbstractConverters&#8203;(<a href="VolcanoPlanner.html" title="class in org.apache.calcite.plan.volcano">VolcanoPlanner</a>&nbsp;planner,
<a href="../RelOptCluster.html" title="class in org.apache.calcite.plan">RelOptCluster</a>&nbsp;cluster,
<a href="RelSubset.html" title="class in org.apache.calcite.plan.volcano">RelSubset</a>&nbsp;subset,
boolean&nbsp;subsetToOthers)</pre>
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<a id="getOrCreateSubset(org.apache.calcite.plan.RelOptCluster,org.apache.calcite.plan.RelTraitSet)">
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<h4>getOrCreateSubset</h4>
<pre class="methodSignature"><a href="RelSubset.html" title="class in org.apache.calcite.plan.volcano">RelSubset</a>&nbsp;getOrCreateSubset&#8203;(<a href="../RelOptCluster.html" title="class in org.apache.calcite.plan">RelOptCluster</a>&nbsp;cluster,
<a href="../RelTraitSet.html" title="class in org.apache.calcite.plan">RelTraitSet</a>&nbsp;traits)</pre>
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<pre class="methodSignature">private&nbsp;void&nbsp;postEquivalenceEvent&#8203;(<a href="VolcanoPlanner.html" title="class in org.apache.calcite.plan.volcano">VolcanoPlanner</a>&nbsp;planner,
<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel)</pre>
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<pre class="methodSignature">void&nbsp;addInternal&#8203;(<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel)</pre>
<div class="block">Adds an expression <code>rel</code> to this set, without creating a
<a href="RelSubset.html" title="class in org.apache.calcite.plan.volcano"><code>RelSubset</code></a>. (Called only from
<a href="RelSubset.html#add(org.apache.calcite.rel.RelNode)"><code>RelSubset.add(org.apache.calcite.rel.RelNode)</code></a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rel</code> - Relational expression</dd>
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<h4>mergeWith</h4>
<pre class="methodSignature">void&nbsp;mergeWith&#8203;(<a href="VolcanoPlanner.html" title="class in org.apache.calcite.plan.volcano">VolcanoPlanner</a>&nbsp;planner,
<a href="RelSet.html" title="class in org.apache.calcite.plan.volcano">RelSet</a>&nbsp;otherSet)</pre>
<div class="block">Merges <code>otherSet</code> into this RelSet.
<p>One generally calls this method after discovering that two relational
expressions are equivalent, and hence the <code>RelSet</code>s they
belong to are equivalent also.
<p>After this method completes, <code>otherSet</code> is obsolete, its
<a href="#equivalentSet"><code>equivalentSet</code></a> member points to this RelSet, and this RelSet is
still alive.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>planner</code> - Planner</dd>
<dd><code>otherSet</code> - RelSet which is equivalent to this one</dd>
</dl>
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