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| <div class="subTitle">org.apache.calcite.rex</div> |
| <h2 title="Class RexNormalize" class="title">Class RexNormalize</h2> |
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| <li>org.apache.calcite.rex.RexNormalize</li> |
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| <pre>public class <span class="typeNameLabel">RexNormalize</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">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="../../../../org/apache/calcite/rex/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> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNormalize.html#hashCode-org.apache.calcite.sql.SqlOperator-java.util.List-">hashCode</a></span>(<a href="../../../../org/apache/calcite/sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> operator, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</code> |
| <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="../../../../org/apache/calcite/util/Pair.html" title="class in org.apache.calcite.util">Pair</a><<a href="../../../../org/apache/calcite/sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexNormalize.html#normalize-org.apache.calcite.sql.SqlOperator-java.util.List-">normalize</a></span>(<a href="../../../../org/apache/calcite/sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> operator, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</code> |
| <div class="block">Normalizes the variables of a rex call.</div> |
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| <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#equals-java.lang.Object-" title="class or interface in java.lang">equals</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#hashCode--" title="class or interface in java.lang">hashCode</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#toString--" title="class or interface in java.lang">toString</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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| <h4>normalize</h4> |
| <pre>@API(since="1.24", |
| status=EXPERIMENTAL) |
| public static <a href="../../../../org/apache/calcite/util/Pair.html" title="class in org.apache.calcite.util">Pair</a><<a href="../../../../org/apache/calcite/sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>>> normalize(<a href="../../../../org/apache/calcite/sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> operator, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../org/apache/calcite/rex/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> |
| </li> |
| </ul> |
| <a name="hashCode-org.apache.calcite.sql.SqlOperator-java.util.List-"> |
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| <h4>hashCode</h4> |
| <pre>public static int hashCode(<a href="../../../../org/apache/calcite/sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> operator, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../org/apache/calcite/rex/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="../../../../org/apache/calcite/rex/RexNormalize.html#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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