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 <h2 title="Class RexNormalize" class="title">Class RexNormalize</h2>
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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 id="i1" class="rowColor">
 <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>
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 <div class="block">Normalizes the variables of a rex call.</div>
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 <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#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</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#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</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#toString()" title="class or interface in java.lang" class="externalLink">toString</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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 <h4>normalize</h4>
 <pre class="methodSignature">@API(since="1.24",
      status=EXPERIMENTAL)
 public static&nbsp;<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;&nbsp;normalize&#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)</pre>
 <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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 <h4>hashCode</h4>
 <pre class="methodSignature">public static&nbsp;int&nbsp;hashCode&#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)</pre>
 <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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	<h2 title="Class RexNormalize" class="title">Class RexNormalize</h2>
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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 → $1 = $2</li>
	<li>$2 > $1 → $1 < $2</li>
	<li>1.23 = $1 → $1 = 1.23</li>
	<li>OR(OR(udf($1), $2), $3) → 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>(<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> 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><<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</code></th>
	<td class="colLast">
	<div class="block">Computes the hashCode of a rex call.</div>
	</td>
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	<tr id="i1" class="rowColor">
	<td class="colFirst"><code>static <a href="../util/Pair.html" title="class in org.apache.calcite.util">Pair</a><<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a>,<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><<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>>></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>(<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> 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><<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</code></th>
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	<div class="block">Normalizes the variables of a rex call.</div>
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	<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#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</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#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</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#toString()" title="class or interface in java.lang" class="externalLink">toString</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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	<h3>Method Detail</h3>
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	<h4>normalize</h4>
	<pre class="methodSignature">@API(since="1.24",
	status=EXPERIMENTAL)
	public static <a href="../util/Pair.html" title="class in org.apache.calcite.util">Pair</a><<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a>,<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><<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>>> normalize(<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> 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><<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</pre>
	<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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	<h4>hashCode</h4>
	<pre class="methodSignature">public static int hashCode(<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> 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><<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</pre>
	<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<org.apache.calcite.rex.RexNode>)</code></a>.</div>
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