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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.rel</a></div>
<h2 title="Class RelDistributionTraitDef" class="title">Class RelDistributionTraitDef</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="../plan/RelTraitDef.html" title="class in org.apache.calcite.plan">org.apache.calcite.plan.RelTraitDef</a>&lt;<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&gt;</li>
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<li>org.apache.calcite.rel.RelDistributionTraitDef</li>
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<pre>public class <span class="typeNameLabel">RelDistributionTraitDef</span>
extends <a href="../plan/RelTraitDef.html" title="class in org.apache.calcite.plan">RelTraitDef</a>&lt;<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&gt;</pre>
<div class="block">Definition of the distribution trait.
<p>Distribution is a physical property (i.e. a trait) because it can be
changed without loss of information. The converter to do this is the
<a href="core/Exchange.html" title="class in org.apache.calcite.rel.core"><code>Exchange</code></a> operator.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Field</th>
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<td class="colFirst"><code>static <a href="RelDistributionTraitDef.html" title="class in org.apache.calcite.rel">RelDistributionTraitDef</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#INSTANCE">INSTANCE</a></span></code></th>
<td class="colLast">&nbsp;</td>
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<th class="colSecond" scope="col">Constructor</th>
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<td class="colFirst"><code>private </code></td>
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">RelDistributionTraitDef</a></span>()</code></th>
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<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#canConvert(org.apache.calcite.plan.RelOptPlanner,org.apache.calcite.rel.RelDistribution,org.apache.calcite.rel.RelDistribution)">canConvert</a></span>&#8203;(<a href="../plan/RelOptPlanner.html" title="interface in org.apache.calcite.plan">RelOptPlanner</a>&nbsp;planner,
<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&nbsp;fromTrait,
<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&nbsp;toTrait)</code></th>
<td class="colLast">
<div class="block">Tests whether the given RelTrait can be converted to another RelTrait.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#convert(org.apache.calcite.plan.RelOptPlanner,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.RelDistribution,boolean)">convert</a></span>&#8203;(<a href="../plan/RelOptPlanner.html" title="interface in org.apache.calcite.plan">RelOptPlanner</a>&nbsp;planner,
<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel,
<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&nbsp;toDistribution,
boolean&nbsp;allowInfiniteCostConverters)</code></th>
<td class="colLast">
<div class="block">Converts the given RelNode to the given RelTrait.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getDefault()">getDefault</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the default member of this trait.</div>
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<td class="colFirst"><code>java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSimpleName()">getSimpleName</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
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<td class="colFirst"><code>java.lang.Class&lt;<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTraitClass()">getTraitClass</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
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<h3>Methods inherited from class&nbsp;org.apache.calcite.plan.<a href="../plan/RelTraitDef.html" title="class in org.apache.calcite.plan">RelTraitDef</a></h3>
<code><a href="../plan/RelTraitDef.html#canConvert(org.apache.calcite.plan.RelOptPlanner,T,T,org.apache.calcite.rel.RelNode)">canConvert</a>, <a href="../plan/RelTraitDef.html#canonize(T)">canonize</a>, <a href="../plan/RelTraitDef.html#deregisterConverterRule(org.apache.calcite.plan.RelOptPlanner,org.apache.calcite.rel.convert.ConverterRule)">deregisterConverterRule</a>, <a href="../plan/RelTraitDef.html#multiple()">multiple</a>, <a href="../plan/RelTraitDef.html#registerConverterRule(org.apache.calcite.plan.RelOptPlanner,org.apache.calcite.rel.convert.ConverterRule)">registerConverterRule</a></code></li>
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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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<pre>public static final&nbsp;<a href="RelDistributionTraitDef.html" title="class in org.apache.calcite.rel">RelDistributionTraitDef</a> INSTANCE</pre>
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<h4>RelDistributionTraitDef</h4>
<pre>private&nbsp;RelDistributionTraitDef()</pre>
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<h4>getTraitClass</h4>
<pre class="methodSignature">public&nbsp;java.lang.Class&lt;<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&gt;&nbsp;getTraitClass()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../plan/RelTraitDef.html#getTraitClass()">getTraitClass</a></code>&nbsp;in class&nbsp;<code><a href="../plan/RelTraitDef.html" title="class in org.apache.calcite.plan">RelTraitDef</a>&lt;<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&gt;</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the specific RelTrait type associated with this RelTraitDef.</dd>
</dl>
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<a id="getSimpleName()">
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<h4>getSimpleName</h4>
<pre class="methodSignature">public&nbsp;java.lang.String&nbsp;getSimpleName()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../plan/RelTraitDef.html#getSimpleName()">getSimpleName</a></code>&nbsp;in class&nbsp;<code><a href="../plan/RelTraitDef.html" title="class in org.apache.calcite.plan">RelTraitDef</a>&lt;<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&gt;</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a simple name for this RelTraitDef (for use in
<a href="RelNode.html#explain(org.apache.calcite.rel.RelWriter)"><code>RelNode.explain(org.apache.calcite.rel.RelWriter)</code></a>).</dd>
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<h4>getDefault</h4>
<pre class="methodSignature">public&nbsp;<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&nbsp;getDefault()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../plan/RelTraitDef.html#getDefault()">RelTraitDef</a></code></span></div>
<div class="block">Returns the default member of this trait.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../plan/RelTraitDef.html#getDefault()">getDefault</a></code>&nbsp;in class&nbsp;<code><a href="../plan/RelTraitDef.html" title="class in org.apache.calcite.plan">RelTraitDef</a>&lt;<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&gt;</code></dd>
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<h4>convert</h4>
<pre class="methodSignature">public&nbsp;<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;convert&#8203;(<a href="../plan/RelOptPlanner.html" title="interface in org.apache.calcite.plan">RelOptPlanner</a>&nbsp;planner,
<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel,
<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&nbsp;toDistribution,
boolean&nbsp;allowInfiniteCostConverters)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../plan/RelTraitDef.html#convert(org.apache.calcite.plan.RelOptPlanner,org.apache.calcite.rel.RelNode,T,boolean)">RelTraitDef</a></code></span></div>
<div class="block">Converts the given RelNode to the given RelTrait.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../plan/RelTraitDef.html#convert(org.apache.calcite.plan.RelOptPlanner,org.apache.calcite.rel.RelNode,T,boolean)">convert</a></code>&nbsp;in class&nbsp;<code><a href="../plan/RelTraitDef.html" title="class in org.apache.calcite.plan">RelTraitDef</a>&lt;<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&gt;</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>planner</code> - the planner requesting the conversion</dd>
<dd><code>rel</code> - RelNode to convert</dd>
<dd><code>toDistribution</code> - RelTrait to convert to</dd>
<dd><code>allowInfiniteCostConverters</code> - flag indicating whether infinite cost
converters are allowed</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a converted RelNode or null if conversion is not possible</dd>
</dl>
</li>
</ul>
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<h4>canConvert</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;canConvert&#8203;(<a href="../plan/RelOptPlanner.html" title="interface in org.apache.calcite.plan">RelOptPlanner</a>&nbsp;planner,
<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&nbsp;fromTrait,
<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&nbsp;toTrait)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../plan/RelTraitDef.html#canConvert(org.apache.calcite.plan.RelOptPlanner,T,T)">RelTraitDef</a></code></span></div>
<div class="block">Tests whether the given RelTrait can be converted to another RelTrait.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../plan/RelTraitDef.html#canConvert(org.apache.calcite.plan.RelOptPlanner,T,T)">canConvert</a></code>&nbsp;in class&nbsp;<code><a href="../plan/RelTraitDef.html" title="class in org.apache.calcite.plan">RelTraitDef</a>&lt;<a href="RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&gt;</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>planner</code> - the planner requesting the conversion test</dd>
<dd><code>fromTrait</code> - the RelTrait to convert from</dd>
<dd><code>toTrait</code> - the RelTrait to convert to</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if fromTrait can be converted to toTrait</dd>
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