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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 RelVisitor" class="title">Class RelVisitor</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li>org.apache.calcite.rel.RelVisitor</li>
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<dt>Direct Known Subclasses:</dt>
<dd><code><a href="../interpreter/Interpreter.CompilerImpl.html" title="class in org.apache.calcite.interpreter">Interpreter.CompilerImpl</a></code>, <code><a href="../plan/RelOptUtil.VariableSetVisitor.html" title="class in org.apache.calcite.plan">RelOptUtil.VariableSetVisitor</a></code>, <code><a href="../sql2rel/RelStructuredTypeFlattener.RewriteRelVisitor.html" title="class in org.apache.calcite.sql2rel">RelStructuredTypeFlattener.RewriteRelVisitor</a></code>, <code><a href="../plan/RelTraitPropagationVisitor.html" title="class in org.apache.calcite.plan">RelTraitPropagationVisitor</a></code>, <code><a href="../plan/TableAccessMap.TableRelVisitor.html" title="class in org.apache.calcite.plan">TableAccessMap.TableRelVisitor</a></code></dd>
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<pre>public abstract class <span class="typeNameLabel">RelVisitor</span>
extends java.lang.Object</pre>
<div class="block">A <code>RelVisitor</code> is a Visitor role in the
<a href="../util/Glossary.html#VISITOR_PATTERN"><code>visitor pattern</code></a> and
visits <a href="RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a> objects as the role of Element. Other components in
the pattern: <a href="RelNode.html#childrenAccept(org.apache.calcite.rel.RelVisitor)"><code>RelNode.childrenAccept(RelVisitor)</code></a>.</div>
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<td class="colFirst"><code>private <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="#root">root</a></span></code></th>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">RelVisitor</a></span>()</code></th>
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<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="#go(org.apache.calcite.rel.RelNode)">go</a></span>&#8203;(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;p)</code></th>
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<div class="block">Starts an iteration.</div>
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<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#replaceRoot(org.apache.calcite.rel.RelNode)">replaceRoot</a></span>&#8203;(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;node)</code></th>
<td class="colLast">
<div class="block">Replaces the root node of this traversal.</div>
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<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#visit(org.apache.calcite.rel.RelNode,int,org.apache.calcite.rel.RelNode)">visit</a></span>&#8203;(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;node,
int&nbsp;ordinal,
<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;parent)</code></th>
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<div class="block">Visits a node during a traversal.</div>
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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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<h4>root</h4>
<pre>private&nbsp;<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> root</pre>
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<h4>RelVisitor</h4>
<pre>public&nbsp;RelVisitor()</pre>
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<h4>visit</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;visit&#8203;(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;node,
int&nbsp;ordinal,
<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;parent)</pre>
<div class="block">Visits a node during a traversal.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>node</code> - Node to visit</dd>
<dd><code>ordinal</code> - Ordinal of node within its parent</dd>
<dd><code>parent</code> - Parent of the node, or null if it is the root of the
traversal</dd>
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<h4>replaceRoot</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;replaceRoot&#8203;(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;node)</pre>
<div class="block">Replaces the root node of this traversal.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>node</code> - The new root node</dd>
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<h4>go</h4>
<pre class="methodSignature">public&nbsp;<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;go&#8203;(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;p)</pre>
<div class="block">Starts an iteration.</div>
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