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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.rex</a></div>
<h2 title="Class RexNode" class="title">Class RexNode</h2>
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<li><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">java.lang.Object</a></li>
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<li>org.apache.calcite.rex.RexNode</li>
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<dt>Direct Known Subclasses:</dt>
<dd><code><a href="RexCall.html" title="class in org.apache.calcite.rex">RexCall</a></code>, <code><a href="RexFieldAccess.html" title="class in org.apache.calcite.rex">RexFieldAccess</a></code>, <code><a href="RexLiteral.html" title="class in org.apache.calcite.rex">RexLiteral</a></code>, <code><a href="RexRangeRef.html" title="class in org.apache.calcite.rex">RexRangeRef</a></code>, <code><a href="RexVariable.html" title="class in org.apache.calcite.rex">RexVariable</a></code></dd>
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<pre>public abstract class <span class="typeNameLabel">RexNode</span>
extends <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></pre>
<div class="block">Row expression.
<p>Every row-expression has a type.
(Compare with <a href="../sql/SqlNode.html" title="class in org.apache.calcite.sql"><code>SqlNode</code></a>, which is created before
validation, and therefore types may not be available.)
<p>Some common row-expressions are: <a href="RexLiteral.html" title="class in org.apache.calcite.rex"><code>RexLiteral</code></a> (constant value),
<a href="RexVariable.html" title="class in org.apache.calcite.rex"><code>RexVariable</code></a> (variable), <a href="RexCall.html" title="class in org.apache.calcite.rex"><code>RexCall</code></a> (call to operator with
operands). Expressions are generally created using a <a href="RexBuilder.html" title="class in org.apache.calcite.rex"><code>RexBuilder</code></a>
factory.</p>
<p>All sub-classes of RexNode are immutable.</p></div>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#digest">digest</a></span></code></th>
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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()">RexNode</a></span>()</code></th>
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<td class="colFirst"><code>abstract &lt;R,&#8203;P&gt;<br>R</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#accept(org.apache.calcite.rex.RexBiVisitor,P)">accept</a></span>&#8203;(<a href="RexBiVisitor.html" title="interface in org.apache.calcite.rex">RexBiVisitor</a>&lt;R,&#8203;P&gt;&nbsp;visitor,
P&nbsp;arg)</code></th>
<td class="colLast">
<div class="block">Accepts a visitor with a payload, dispatching to the right overloaded
<a href="RexBiVisitor.html#visitInputRef(org.apache.calcite.rex.RexInputRef,P)"><code>RexBiVisitor.visitInputRef(RexInputRef, Object)</code></a> visitXxx} method.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>abstract &lt;R&gt;&nbsp;R</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#accept(org.apache.calcite.rex.RexVisitor)">accept</a></span>&#8203;(<a href="RexVisitor.html" title="interface in org.apache.calcite.rex">RexVisitor</a>&lt;R&gt;&nbsp;visitor)</code></th>
<td class="colLast">
<div class="block">Accepts a visitor, dispatching to the right overloaded
<a href="RexVisitor.html#visitInputRef(org.apache.calcite.rex.RexInputRef)"><code>visitXxx</code></a> method.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>abstract boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#equals(java.lang.Object)">equals</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>&nbsp;obj)</code></th>
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<td class="colFirst"><code><a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getKind()">getKind</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the kind of node this is.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>abstract <a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getType()">getType</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>abstract int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#hashCode()">hashCode</a></span>()</code></th>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isA(java.util.Collection)">isA</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a>&gt;&nbsp;kinds)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isA(org.apache.calcite.sql.SqlKind)">isA</a></span>&#8203;(<a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a>&nbsp;kind)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isAlwaysFalse()">isAlwaysFalse</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns whether this expression always returns false.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isAlwaysTrue()">isAlwaysTrue</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns whether this expression always returns true.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#nodeCount()">nodeCount</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the number of nodes in this expression.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString()">toString</a></span>()</code></th>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink">wait</a></code></li>
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<pre>protected&nbsp;<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> digest</pre>
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<h4>RexNode</h4>
<pre>public&nbsp;RexNode()</pre>
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<h4>getType</h4>
<pre class="methodSignature">public abstract&nbsp;<a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;getType()</pre>
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<h4>isAlwaysTrue</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;isAlwaysTrue()</pre>
<div class="block">Returns whether this expression always returns true. (Such as if this
expression is equal to the literal <code>TRUE</code>.)</div>
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<h4>isAlwaysFalse</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;isAlwaysFalse()</pre>
<div class="block">Returns whether this expression always returns false. (Such as if this
expression is equal to the literal <code>FALSE</code>.)</div>
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<pre class="methodSignature">public&nbsp;boolean&nbsp;isA&#8203;(<a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a>&nbsp;kind)</pre>
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<pre class="methodSignature">public&nbsp;boolean&nbsp;isA&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a>&gt;&nbsp;kinds)</pre>
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<h4>getKind</h4>
<pre class="methodSignature">public&nbsp;<a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a>&nbsp;getKind()</pre>
<div class="block">Returns the kind of node this is.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>Node kind, never null</dd>
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<h4>toString</h4>
<pre class="methodSignature">public&nbsp;<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;toString()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink">toString</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></code></dd>
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<h4>nodeCount</h4>
<pre class="methodSignature">public&nbsp;int&nbsp;nodeCount()</pre>
<div class="block">Returns the number of nodes in this expression.
<p>Leaf nodes, such as <a href="RexInputRef.html" title="class in org.apache.calcite.rex"><code>RexInputRef</code></a> or <a href="RexLiteral.html" title="class in org.apache.calcite.rex"><code>RexLiteral</code></a>, have
a count of 1. Calls have a count of 1 plus the sum of their operands.
<p>Node count is a measure of expression complexity that is used by some
planner rules to prevent deeply nested expressions.</div>
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<h4>accept</h4>
<pre class="methodSignature">public abstract&nbsp;&lt;R&gt;&nbsp;R&nbsp;accept&#8203;(<a href="RexVisitor.html" title="interface in org.apache.calcite.rex">RexVisitor</a>&lt;R&gt;&nbsp;visitor)</pre>
<div class="block">Accepts a visitor, dispatching to the right overloaded
<a href="RexVisitor.html#visitInputRef(org.apache.calcite.rex.RexInputRef)"><code>visitXxx</code></a> method.
<p>Also see <a href="RexUtil.html#apply(org.apache.calcite.rex.RexVisitor,java.util.List,org.apache.calcite.rex.RexNode)"><code>RexUtil.apply(RexVisitor, java.util.List, RexNode)</code></a>,
which applies a visitor to several expressions simultaneously.</div>
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<h4>accept</h4>
<pre class="methodSignature">public abstract&nbsp;&lt;R,&#8203;P&gt;&nbsp;R&nbsp;accept&#8203;(<a href="RexBiVisitor.html" title="interface in org.apache.calcite.rex">RexBiVisitor</a>&lt;R,&#8203;P&gt;&nbsp;visitor,
P&nbsp;arg)</pre>
<div class="block">Accepts a visitor with a payload, dispatching to the right overloaded
<a href="RexBiVisitor.html#visitInputRef(org.apache.calcite.rex.RexInputRef,P)"><code>RexBiVisitor.visitInputRef(RexInputRef, Object)</code></a> visitXxx} method.</div>
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<h4>equals</h4>
<pre class="methodSignature">public abstract&nbsp;boolean&nbsp;equals&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>&nbsp;obj)</pre>
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<p>Every node must implement <a href="#equals(java.lang.Object)"><code>equals(java.lang.Object)</code></a> based on its content</div>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></code></dd>
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<h4>hashCode</h4>
<pre class="methodSignature">public abstract&nbsp;int&nbsp;hashCode()</pre>
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<p>Every node must implement <a href="#hashCode()"><code>hashCode()</code></a> consistent with
<a href="#equals(java.lang.Object)"><code>equals(java.lang.Object)</code></a></div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></code></dd>
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