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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.calcite.rex</a></div> |
| <h1 title="Class RexNormalize" class="title">Class RexNormalize</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance">org.apache.calcite.rex.RexNormalize</div> |
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| <section class="class-description" id="class-description"> |
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| <div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">RexNormalize</span> |
| <span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div> |
| <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> |
| </section> |
| <section class="summary"> |
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| <!-- ========== METHOD SUMMARY =========== --> |
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| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
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| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static int</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#hashCode(org.apache.calcite.sql.SqlOperator,java.util.List)" class="member-name-link">hashCode</a><wbr>(<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> operator, |
| <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Computes the hashCode of a rex call.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><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>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>>></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#normalize(org.apache.calcite.sql.SqlOperator,java.util.List)" class="member-name-link">normalize</a><wbr>(<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> operator, |
| <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Normalizes the variables of a rex call.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
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| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
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| </section> |
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| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ METHOD DETAIL ========== --> |
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| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="normalize(org.apache.calcite.sql.SqlOperator,java.util.List)"> |
| <h3>normalize</h3> |
| <div class="member-signature"><span class="annotations">@API(since="1.24", |
| status=EXPERIMENTAL) |
| </span><span class="modifiers">public static</span> <span class="return-type"><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>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>>></span> <span class="element-name">normalize</span><wbr><span class="parameters">(<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> operator, |
| <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</span></div> |
| <div class="block">Normalizes the variables of a rex call.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>operator</code> - The operator</dd> |
| <dd><code>operands</code> - The operands</dd> |
| <dt>Returns:</dt> |
| <dd>normalized variables of the call or the original |
| if there is no need to normalize</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="hashCode(org.apache.calcite.sql.SqlOperator,java.util.List)"> |
| <h3>hashCode</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">int</span> <span class="element-name">hashCode</span><wbr><span class="parameters">(<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> operator, |
| <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> 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<org.apache.calcite.rex.RexNode>)</code></a>.</div> |
| </section> |
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