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<div class="subTitle">org.apache.calcite.rel.rules</div>
<h2 title="类 ReduceDecimalsRule" class="title">类 ReduceDecimalsRule</h2>
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<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">org.apache.calcite.plan.RelOptRule</a></li>
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<li>org.apache.calcite.rel.rules.ReduceDecimalsRule</li>
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<pre>public class <span class="typeNameLabel">ReduceDecimalsRule</span>
extends <a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></pre>
<div class="block">ReduceDecimalsRule is a rule which reduces decimal operations (such as casts
or arithmetic) into operations involving more primitive types (such as longs
and doubles). The rule allows Calcite implementations to deal with decimals
in a consistent manner, while saving the effort of implementing them.
<p>The rule can be applied to a
<a href="../../../../../org/apache/calcite/rel/logical/LogicalCalc.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalCalc</code></a> with a program for which
<a href="../../../../../org/apache/calcite/rex/RexUtil.html#requiresDecimalExpansion-org.apache.calcite.rex.RexNode-boolean-"><code>RexUtil.requiresDecimalExpansion(org.apache.calcite.rex.RexNode, boolean)</code></a> returns true. The rule relies on a
<a href="../../../../../org/apache/calcite/rex/RexShuttle.html" title="org.apache.calcite.rex中的类"><code>RexShuttle</code></a> to walk over relational expressions and replace them.
<p>While decimals are generally not implemented by the Calcite runtime, the
rule is optionally applied, in order to support the situation in which we
would like to push down decimal operations to an external database.</div>
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<caption><span>嵌套类</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">限定符和类型</th>
<th class="colLast" scope="col">类和说明</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.DecimalShuttle.html" title="org.apache.calcite.rel.rules中的类">ReduceDecimalsRule.DecimalShuttle</a></span></code>
<div class="block">A shuttle which converts decimal expressions to expressions based on
longs.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html" title="org.apache.calcite.rel.rules中的类">ReduceDecimalsRule.RexExpander</a></span></code>
<div class="block">Rewrites a decimal expression for a specific set of SqlOperator's.</div>
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<th class="colFirst" scope="col">限定符和类型</th>
<th class="colLast" scope="col">字段和说明</th>
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<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.html" title="org.apache.calcite.rel.rules中的类">ReduceDecimalsRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.html#INSTANCE">INSTANCE</a></span></code>&nbsp;</td>
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<h3>从类继承的字段&nbsp;org.apache.calcite.plan.<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></h3>
<code><a href="../../../../../org/apache/calcite/plan/RelOptRule.html#description">description</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#operands">operands</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#relBuilderFactory">relBuilderFactory</a></code></li>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.html#ReduceDecimalsRule-org.apache.calcite.tools.RelBuilderFactory-">ReduceDecimalsRule</a></span>(<a href="../../../../../org/apache/calcite/tools/RelBuilderFactory.html" title="org.apache.calcite.tools中的接口">RelBuilderFactory</a>&nbsp;relBuilderFactory)</code>
<div class="block">Creates a ReduceDecimalsRule.</div>
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<td class="colFirst"><code><a href="../../../../../org/apache/calcite/plan/Convention.html" title="org.apache.calcite.plan中的接口">Convention</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.html#getOutConvention--">getOutConvention</a></span>()</code>
<div class="block">Returns the convention of the result of firing this rule, null if
not known.</div>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.html#onMatch-org.apache.calcite.plan.RelOptRuleCall-">onMatch</a></span>(<a href="../../../../../org/apache/calcite/plan/RelOptRuleCall.html" title="org.apache.calcite.plan中的类">RelOptRuleCall</a>&nbsp;call)</code>
<div class="block">Receives notification about a rule match.</div>
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<h3>从类继承的方法&nbsp;org.apache.calcite.plan.<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></h3>
<code><a href="../../../../../org/apache/calcite/plan/RelOptRule.html#any--">any</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#convert-org.apache.calcite.rel.RelNode-org.apache.calcite.plan.RelTrait-">convert</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#convert-org.apache.calcite.rel.RelNode-org.apache.calcite.plan.RelTraitSet-">convert</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#convertList-java.util.List-org.apache.calcite.plan.RelTrait-">convertList</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#convertOperand-java.lang.Class-java.util.function.Predicate-org.apache.calcite.plan.RelTrait-">convertOperand</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#convertOperand-java.lang.Class-com.google.common.base.Predicate-org.apache.calcite.plan.RelTrait-">convertOperand</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#equals-java.lang.Object-">equals</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#equals-org.apache.calcite.plan.RelOptRule-">equals</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#getOperand--">getOperand</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#getOperands--">getOperands</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#getOutTrait--">getOutTrait</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#hashCode--">hashCode</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#matches-org.apache.calcite.plan.RelOptRuleCall-">matches</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#none--">none</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#operand-java.lang.Class-org.apache.calcite.plan.RelOptRuleOperandChildren-">operand</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#operand-java.lang.Class-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.plan.RelOptRuleOperand...-">operand</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#operand-java.lang.Class-org.apache.calcite.plan.RelTrait-com.google.common.base.Predicate-org.apache.calcite.plan.RelOptRuleOperandChildren-">operand</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#operand-java.lang.Class-org.apache.calcite.plan.RelTrait-com.google.common.base.Predicate-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.plan.RelOptRuleOperand...-">operand</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#operand-java.lang.Class-org.apache.calcite.plan.RelTrait-org.apache.calcite.plan.RelOptRuleOperandChildren-">operand</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#operandJ-java.lang.Class-org.apache.calcite.plan.RelTrait-java.util.function.Predicate-org.apache.calcite.plan.RelOptRuleOperandChildren-">operandJ</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#operandJ-java.lang.Class-org.apache.calcite.plan.RelTrait-java.util.function.Predicate-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.plan.RelOptRuleOperand...-">operandJ</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#some-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.plan.RelOptRuleOperand...-">some</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#toString--">toString</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#unordered-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.plan.RelOptRuleOperand...-">unordered</a></code></li>
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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="java.lang中的类或接口">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="java.lang中的类或接口">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="java.lang中的类或接口">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="java.lang中的类或接口">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="java.lang中的类或接口">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="java.lang中的类或接口">wait</a></code></li>
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<pre>public static final&nbsp;<a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.html" title="org.apache.calcite.rel.rules中的类">ReduceDecimalsRule</a> INSTANCE</pre>
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<h4>ReduceDecimalsRule</h4>
<pre>public&nbsp;ReduceDecimalsRule(<a href="../../../../../org/apache/calcite/tools/RelBuilderFactory.html" title="org.apache.calcite.tools中的接口">RelBuilderFactory</a>&nbsp;relBuilderFactory)</pre>
<div class="block">Creates a ReduceDecimalsRule.</div>
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<pre>public&nbsp;<a href="../../../../../org/apache/calcite/plan/Convention.html" title="org.apache.calcite.plan中的接口">Convention</a>&nbsp;getOutConvention()</pre>
<div class="block"><span class="descfrmTypeLabel">从类复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/plan/RelOptRule.html#getOutConvention--">RelOptRule</a></code></span></div>
<div class="block">Returns the convention of the result of firing this rule, null if
not known.</div>
<dl>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/plan/RelOptRule.html#getOutConvention--">getOutConvention</a></code>&nbsp;在类中&nbsp;<code><a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>Convention of the result of firing this rule, null if
not known</dd>
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<h4>onMatch</h4>
<pre>public&nbsp;void&nbsp;onMatch(<a href="../../../../../org/apache/calcite/plan/RelOptRuleCall.html" title="org.apache.calcite.plan中的类">RelOptRuleCall</a>&nbsp;call)</pre>
<div class="block"><span class="descfrmTypeLabel">从类复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/plan/RelOptRule.html#onMatch-org.apache.calcite.plan.RelOptRuleCall-">RelOptRule</a></code></span></div>
<div class="block">Receives notification about a rule match. At the time that this method is
called, <a href="../../../../../org/apache/calcite/plan/RelOptRuleCall.html#rels"><code>call.rels</code></a> holds the set of relational
expressions which match the operands to the rule; <code>
call.rels[0]</code> is the root expression.
<p>Typically a rule would check that the nodes are valid matches, creates
a new expression, then calls back <a href="../../../../../org/apache/calcite/plan/RelOptRuleCall.html#transformTo-org.apache.calcite.rel.RelNode-java.util.Map-org.apache.calcite.plan.RelHintsPropagator-"><code>RelOptRuleCall.transformTo(org.apache.calcite.rel.RelNode, java.util.Map&lt;org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelNode&gt;, org.apache.calcite.plan.RelHintsPropagator)</code></a> to
register the expression.</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/plan/RelOptRule.html#onMatch-org.apache.calcite.plan.RelOptRuleCall-">onMatch</a></code>&nbsp;在类中&nbsp;<code><a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></code></dd>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>call</code> - Rule call</dd>
<dt><span class="seeLabel">另请参阅:</span></dt>
<dd><a href="../../../../../org/apache/calcite/plan/RelOptRule.html#matches-org.apache.calcite.plan.RelOptRuleCall-"><code>RelOptRule.matches(RelOptRuleCall)</code></a></dd>
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