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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.rex</a></div>
<h1 title="Class RexNormalize" class="title">Class RexNormalize</h1>
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<div class="inheritance">org.apache.calcite.rex.RexNormalize</div>
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<pre>public class <span class="typeNameLabel">RexNormalize</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">Context required to normalize a row-expression.
<p>Currently, only simple normalization is supported, such as:
<ul>
<li>$2 = $1 &rarr; $1 = $2</li>
<li>$2 &gt; $1 &rarr; $1 &lt; $2</li>
<li>1.23 = $1 &rarr; $1 = 1.23</li>
<li>OR(OR(udf($1), $2), $3) &rarr; OR($3, OR($2, udf($1)))</li>
</ul>
<p>In the future, this component may extend to support more normalization cases
for general promotion. e.g. the strategy to decide which operand is more complex
should be more smart.
<p>There is no one normalization strategy that works for all cases, and no consensus about what
the desired strategies should be. So by default, the normalization is disabled. We do force
normalization when computing the digest of <a href="RexCall.html" title="class in org.apache.calcite.rex"><code>RexCall</code></a>s during planner planning.</div>
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<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#hashCode(org.apache.calcite.sql.SqlOperator,java.util.List)">hashCode</a></span>&#8203;(<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a>&nbsp;operator,
<a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a>&lt;<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&nbsp;operands)</code></th>
<td class="colLast">
<div class="block">Computes the hashCode of a rex call.</div>
</td>
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<tr class="rowColor" id="i1">
<td class="colFirst"><code>static <a href="../util/Pair.html" title="class in org.apache.calcite.util">Pair</a>&lt;<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a>,&#8203;<a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a>&lt;<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#normalize(org.apache.calcite.sql.SqlOperator,java.util.List)">normalize</a></span>&#8203;(<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a>&nbsp;operator,
<a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a>&lt;<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&nbsp;operands)</code></th>
<td class="colLast">
<div class="block">Normalizes the variables of a rex call.</div>
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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>
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<h3><a id="normalize(org.apache.calcite.sql.SqlOperator,java.util.List)">normalize</a></h3>
<div class="memberSignature"><span class="annotations">@API(since="1.24",
status=EXPERIMENTAL)
</span><span class="modifiers">public static</span>&nbsp;<span class="returnType"><a href="../util/Pair.html" title="class in org.apache.calcite.util">Pair</a>&lt;<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a>,&#8203;<a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a>&lt;<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&gt;</span>&nbsp;<span class="memberName">normalize</span>&#8203;(<span class="arguments"><a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a>&nbsp;operator,
<a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a>&lt;<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&nbsp;operands)</span></div>
<div class="block">Normalizes the variables of a rex call.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>operator</code> - The operator</dd>
<dd><code>operands</code> - The operands</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>normalized variables of the call or the original
if there is no need to normalize</dd>
</dl>
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<h3><a id="hashCode(org.apache.calcite.sql.SqlOperator,java.util.List)">hashCode</a></h3>
<div class="memberSignature"><span class="modifiers">public static</span>&nbsp;<span class="returnType">int</span>&nbsp;<span class="memberName">hashCode</span>&#8203;(<span class="arguments"><a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a>&nbsp;operator,
<a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a>&lt;<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&nbsp;operands)</span></div>
<div class="block">Computes the hashCode of a rex call. We ignore the operands sequence when the call is
symmetrical.
<p>Note that the logic to decide whether operands need reordering
should be strictly same with <a href="#normalize(org.apache.calcite.sql.SqlOperator,java.util.List)"><code>normalize(org.apache.calcite.sql.SqlOperator, java.util.List&lt;org.apache.calcite.rex.RexNode&gt;)</code></a>.</div>
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