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<div class="subTitle">org.apache.calcite.rex</div>
<h2 title="Class RexNode" class="title">Class RexNode</h2>
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<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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<li>org.apache.calcite.rex.RexNode</li>
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<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../org/apache/calcite/rex/RexCall.html" title="class in org.apache.calcite.rex">RexCall</a>, <a href="../../../../org/apache/calcite/rex/RexFieldAccess.html" title="class in org.apache.calcite.rex">RexFieldAccess</a>, <a href="../../../../org/apache/calcite/rex/RexLiteral.html" title="class in org.apache.calcite.rex">RexLiteral</a>, <a href="../../../../org/apache/calcite/rex/RexRangeRef.html" title="class in org.apache.calcite.rex">RexRangeRef</a>, <a href="../../../../org/apache/calcite/rex/RexVariable.html" title="class in org.apache.calcite.rex">RexVariable</a></dd>
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<pre>public abstract class <span class="typeNameLabel">RexNode</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">Row expression.
<p>Every row-expression has a type.
(Compare with <a href="../../../../org/apache/calcite/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="../../../../org/apache/calcite/rex/RexLiteral.html" title="class in org.apache.calcite.rex"><code>RexLiteral</code></a> (constant value),
<a href="../../../../org/apache/calcite/rex/RexVariable.html" title="class in org.apache.calcite.rex"><code>RexVariable</code></a> (variable), <a href="../../../../org/apache/calcite/rex/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="../../../../org/apache/calcite/rex/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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<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="colLast" scope="col">Field and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#digest">digest</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#RexNode--">RexNode</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>abstract &lt;R,P&gt;&nbsp;R</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#accept-org.apache.calcite.rex.RexBiVisitor-P-">accept</a></span>(<a href="../../../../org/apache/calcite/rex/RexBiVisitor.html" title="interface in org.apache.calcite.rex">RexBiVisitor</a>&lt;R,P&gt;&nbsp;visitor,
P&nbsp;arg)</code>
<div class="block">Accepts a visitor with a payload, dispatching to the right overloaded
<a href="../../../../org/apache/calcite/rex/RexBiVisitor.html#visitInputRef-org.apache.calcite.rex.RexInputRef-P-"><code>RexBiVisitor.visitInputRef(RexInputRef, Object)</code></a> visitXxx} method.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>abstract &lt;R&gt;&nbsp;R</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#accept-org.apache.calcite.rex.RexVisitor-">accept</a></span>(<a href="../../../../org/apache/calcite/rex/RexVisitor.html" title="interface in org.apache.calcite.rex">RexVisitor</a>&lt;R&gt;&nbsp;visitor)</code>
<div class="block">Accepts a visitor, dispatching to the right overloaded
<a href="../../../../org/apache/calcite/rex/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>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#equals-java.lang.Object-">equals</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;obj)</code></td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#getKind--">getKind</a></span>()</code>
<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="../../../../org/apache/calcite/rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#getType--">getType</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>abstract int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#hashCode--">hashCode</a></span>()</code></td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#isA-java.util.Collection-">isA</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/apache/calcite/sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a>&gt;&nbsp;kinds)</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#isA-org.apache.calcite.sql.SqlKind-">isA</a></span>(<a href="../../../../org/apache/calcite/sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a>&nbsp;kind)</code>&nbsp;</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#isAlwaysFalse--">isAlwaysFalse</a></span>()</code>
<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>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#isAlwaysTrue--">isAlwaysTrue</a></span>()</code>
<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>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#nodeCount--">nodeCount</a></span>()</code>
<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/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNode.html#toString--">toString</a></span>()</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h3>Field Detail</h3>
<a name="digest">
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<h4>digest</h4>
<pre>protected&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> digest</pre>
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<h3>Constructor Detail</h3>
<a name="RexNode--">
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<h4>RexNode</h4>
<pre>public&nbsp;RexNode()</pre>
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<a name="getType--">
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<h4>getType</h4>
<pre>public abstract&nbsp;<a href="../../../../org/apache/calcite/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>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>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>
</li>
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<a name="isA-org.apache.calcite.sql.SqlKind-">
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<h4>isA</h4>
<pre>public&nbsp;boolean&nbsp;isA(<a href="../../../../org/apache/calcite/sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a>&nbsp;kind)</pre>
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<h4>isA</h4>
<pre>public&nbsp;boolean&nbsp;isA(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/apache/calcite/sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a>&gt;&nbsp;kinds)</pre>
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<pre>public&nbsp;<a href="../../../../org/apache/calcite/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>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Node kind, never null</dd>
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<a name="toString--">
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<h4>toString</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;toString()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
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<h4>nodeCount</h4>
<pre>public&nbsp;int&nbsp;nodeCount()</pre>
<div class="block">Returns the number of nodes in this expression.
<p>Leaf nodes, such as <a href="../../../../org/apache/calcite/rex/RexInputRef.html" title="class in org.apache.calcite.rex"><code>RexInputRef</code></a> or <a href="../../../../org/apache/calcite/rex/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>
</li>
</ul>
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<h4>accept</h4>
<pre>public abstract&nbsp;&lt;R&gt;&nbsp;R&nbsp;accept(<a href="../../../../org/apache/calcite/rex/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="../../../../org/apache/calcite/rex/RexVisitor.html#visitInputRef-org.apache.calcite.rex.RexInputRef-"><code>visitXxx</code></a> method.
<p>Also see <a href="../../../../org/apache/calcite/rex/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>
</li>
</ul>
<a name="accept-org.apache.calcite.rex.RexBiVisitor-java.lang.Object-">
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<h4>accept</h4>
<pre>public abstract&nbsp;&lt;R,P&gt;&nbsp;R&nbsp;accept(<a href="../../../../org/apache/calcite/rex/RexBiVisitor.html" title="interface in org.apache.calcite.rex">RexBiVisitor</a>&lt;R,P&gt;&nbsp;visitor,
P&nbsp;arg)</pre>
<div class="block">Accepts a visitor with a payload, dispatching to the right overloaded
<a href="../../../../org/apache/calcite/rex/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>public abstract&nbsp;boolean&nbsp;equals(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;obj)</pre>
<div class="block">
<p>Every node must implement <a href="../../../../org/apache/calcite/rex/RexNode.html#equals-java.lang.Object-"><code>equals(java.lang.Object)</code></a> based on its content</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
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<h4>hashCode</h4>
<pre>public abstract&nbsp;int&nbsp;hashCode()</pre>
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