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<div class="subTitle">org.apache.calcite.rel.rules</div>
<h2 title="类 PruneEmptyRules" class="title">类 PruneEmptyRules</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">java.lang.Object</a></li>
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<li>org.apache.calcite.rel.rules.PruneEmptyRules</li>
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<pre>public abstract class <span class="typeNameLabel">PruneEmptyRules</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></pre>
<div class="block">Collection of rules which remove sections of a query plan known never to
produce any rows.
<p>Conventionally, the way to represent an empty relational expression is
with a <a href="../../../../../org/apache/calcite/rel/core/Values.html" title="org.apache.calcite.rel.core中的类"><code>Values</code></a> that has no tuples.</div>
<dl>
<dt><span class="seeLabel">另请参阅:</span></dt>
<dd><a href="../../../../../org/apache/calcite/rel/logical/LogicalValues.html#createEmpty-org.apache.calcite.plan.RelOptCluster-org.apache.calcite.rel.type.RelDataType-"><code>LogicalValues.createEmpty(org.apache.calcite.plan.RelOptCluster, org.apache.calcite.rel.type.RelDataType)</code></a></dd>
</dl>
</li>
</ul>
</div>
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<h3>嵌套类概要</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="嵌套类概要表, 列表嵌套类和解释">
<caption><span>嵌套类</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<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>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PruneEmptyRules.RemoveEmptySingleRule.html" title="org.apache.calcite.rel.rules中的类">PruneEmptyRules.RemoveEmptySingleRule</a></span></code>
<div class="block">Planner rule that converts a single-rel (e.g. project, sort, aggregate or
filter) on top of the empty relational expression into empty.</div>
</td>
</tr>
</table>
</li>
</ul>
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<h3>字段概要</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="字段概要表, 列表字段和解释">
<caption><span>字段</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">限定符和类型</th>
<th class="colLast" scope="col">字段和说明</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PruneEmptyRules.html#AGGREGATE_INSTANCE">AGGREGATE_INSTANCE</a></span></code>
<div class="block">Rule that converts an <a href="../../../../../org/apache/calcite/rel/core/Aggregate.html" title="org.apache.calcite.rel.core中的类"><code>Aggregate</code></a>
to empty if its child is empty.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PruneEmptyRules.html#FILTER_INSTANCE">FILTER_INSTANCE</a></span></code>
<div class="block">Rule that converts a <a href="../../../../../org/apache/calcite/rel/logical/LogicalFilter.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalFilter</code></a>
to empty if its child is empty.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PruneEmptyRules.html#INTERSECT_INSTANCE">INTERSECT_INSTANCE</a></span></code>
<div class="block">Rule that converts a
<a href="../../../../../org/apache/calcite/rel/logical/LogicalIntersect.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalIntersect</code></a> to
empty if any of its children are empty.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PruneEmptyRules.html#JOIN_LEFT_INSTANCE">JOIN_LEFT_INSTANCE</a></span></code>
<div class="block">Rule that converts a <a href="../../../../../org/apache/calcite/rel/core/Join.html" title="org.apache.calcite.rel.core中的类"><code>Join</code></a>
to empty if its left child is empty.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PruneEmptyRules.html#JOIN_RIGHT_INSTANCE">JOIN_RIGHT_INSTANCE</a></span></code>
<div class="block">Rule that converts a <a href="../../../../../org/apache/calcite/rel/core/Join.html" title="org.apache.calcite.rel.core中的类"><code>Join</code></a>
to empty if its right child is empty.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PruneEmptyRules.html#MINUS_INSTANCE">MINUS_INSTANCE</a></span></code>
<div class="block">Rule that removes empty children of a
<a href="../../../../../org/apache/calcite/rel/logical/LogicalMinus.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalMinus</code></a>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PruneEmptyRules.html#PROJECT_INSTANCE">PROJECT_INSTANCE</a></span></code>
<div class="block">Rule that converts a <a href="../../../../../org/apache/calcite/rel/logical/LogicalProject.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalProject</code></a>
to empty if its child is empty.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PruneEmptyRules.html#SORT_FETCH_ZERO_INSTANCE">SORT_FETCH_ZERO_INSTANCE</a></span></code>
<div class="block">Rule that converts a <a href="../../../../../org/apache/calcite/rel/core/Sort.html" title="org.apache.calcite.rel.core中的类"><code>Sort</code></a>
to empty if it has <code>LIMIT 0</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PruneEmptyRules.html#SORT_INSTANCE">SORT_INSTANCE</a></span></code>
<div class="block">Rule that converts a <a href="../../../../../org/apache/calcite/rel/core/Sort.html" title="org.apache.calcite.rel.core中的类"><code>Sort</code></a>
to empty if its child is empty.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PruneEmptyRules.html#UNION_INSTANCE">UNION_INSTANCE</a></span></code>
<div class="block">Rule that removes empty children of a
<a href="../../../../../org/apache/calcite/rel/logical/LogicalUnion.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalUnion</code></a>.</div>
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<h3>构造器概要</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="构造器概要表, 列表构造器和解释">
<caption><span>构造器</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">构造器和说明</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PruneEmptyRules.html#PruneEmptyRules--">PruneEmptyRules</a></span>()</code>&nbsp;</td>
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<h3>从类继承的方法&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></h3>
<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#equals-java.lang.Object-" title="java.lang中的类或接口">equals</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#hashCode--" title="java.lang中的类或接口">hashCode</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#toString--" title="java.lang中的类或接口">toString</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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<h3>字段详细资料</h3>
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<h4>UNION_INSTANCE</h4>
<pre>public static final&nbsp;<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a> UNION_INSTANCE</pre>
<div class="block">Rule that removes empty children of a
<a href="../../../../../org/apache/calcite/rel/logical/LogicalUnion.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalUnion</code></a>.
<p>Examples:
<ul>
<li>Union(Rel, Empty, Rel2) becomes Union(Rel, Rel2)
<li>Union(Rel, Empty, Empty) becomes Rel
<li>Union(Empty, Empty) becomes Empty
</ul></div>
</li>
</ul>
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<h4>MINUS_INSTANCE</h4>
<pre>public static final&nbsp;<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a> MINUS_INSTANCE</pre>
<div class="block">Rule that removes empty children of a
<a href="../../../../../org/apache/calcite/rel/logical/LogicalMinus.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalMinus</code></a>.
<p>Examples:
<ul>
<li>Minus(Rel, Empty, Rel2) becomes Minus(Rel, Rel2)
<li>Minus(Empty, Rel) becomes Empty
</ul></div>
</li>
</ul>
<a name="INTERSECT_INSTANCE">
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<h4>INTERSECT_INSTANCE</h4>
<pre>public static final&nbsp;<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a> INTERSECT_INSTANCE</pre>
<div class="block">Rule that converts a
<a href="../../../../../org/apache/calcite/rel/logical/LogicalIntersect.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalIntersect</code></a> to
empty if any of its children are empty.
<p>Examples:
<ul>
<li>Intersect(Rel, Empty, Rel2) becomes Empty
<li>Intersect(Empty, Rel) becomes Empty
</ul></div>
</li>
</ul>
<a name="PROJECT_INSTANCE">
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</a>
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<li class="blockList">
<h4>PROJECT_INSTANCE</h4>
<pre>public static final&nbsp;<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a> PROJECT_INSTANCE</pre>
<div class="block">Rule that converts a <a href="../../../../../org/apache/calcite/rel/logical/LogicalProject.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalProject</code></a>
to empty if its child is empty.
<p>Examples:
<ul>
<li>Project(Empty) becomes Empty
</ul></div>
</li>
</ul>
<a name="FILTER_INSTANCE">
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<li class="blockList">
<h4>FILTER_INSTANCE</h4>
<pre>public static final&nbsp;<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a> FILTER_INSTANCE</pre>
<div class="block">Rule that converts a <a href="../../../../../org/apache/calcite/rel/logical/LogicalFilter.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalFilter</code></a>
to empty if its child is empty.
<p>Examples:
<ul>
<li>Filter(Empty) becomes Empty
</ul></div>
</li>
</ul>
<a name="SORT_INSTANCE">
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</a>
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<li class="blockList">
<h4>SORT_INSTANCE</h4>
<pre>public static final&nbsp;<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a> SORT_INSTANCE</pre>
<div class="block">Rule that converts a <a href="../../../../../org/apache/calcite/rel/core/Sort.html" title="org.apache.calcite.rel.core中的类"><code>Sort</code></a>
to empty if its child is empty.
<p>Examples:
<ul>
<li>Sort(Empty) becomes Empty
</ul></div>
</li>
</ul>
<a name="SORT_FETCH_ZERO_INSTANCE">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>SORT_FETCH_ZERO_INSTANCE</h4>
<pre>public static final&nbsp;<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a> SORT_FETCH_ZERO_INSTANCE</pre>
<div class="block">Rule that converts a <a href="../../../../../org/apache/calcite/rel/core/Sort.html" title="org.apache.calcite.rel.core中的类"><code>Sort</code></a>
to empty if it has <code>LIMIT 0</code>.
<p>Examples:
<ul>
<li>Sort(Empty) becomes Empty
</ul></div>
</li>
</ul>
<a name="AGGREGATE_INSTANCE">
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<h4>AGGREGATE_INSTANCE</h4>
<pre>public static final&nbsp;<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a> AGGREGATE_INSTANCE</pre>
<div class="block">Rule that converts an <a href="../../../../../org/apache/calcite/rel/core/Aggregate.html" title="org.apache.calcite.rel.core中的类"><code>Aggregate</code></a>
to empty if its child is empty.
<p>Examples:
<ul>
<li><code>Aggregate(key: [1, 3], Empty)</code> &rarr; <code>Empty</code>
<li><code>Aggregate(key: [], Empty)</code> is unchanged, because an aggregate
without a GROUP BY key always returns 1 row, even over empty input
</ul></div>
<dl>
<dt><span class="seeLabel">另请参阅:</span></dt>
<dd><a href="../../../../../org/apache/calcite/rel/rules/AggregateValuesRule.html" title="org.apache.calcite.rel.rules中的类"><code>AggregateValuesRule</code></a></dd>
</dl>
</li>
</ul>
<a name="JOIN_LEFT_INSTANCE">
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<h4>JOIN_LEFT_INSTANCE</h4>
<pre>public static final&nbsp;<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a> JOIN_LEFT_INSTANCE</pre>
<div class="block">Rule that converts a <a href="../../../../../org/apache/calcite/rel/core/Join.html" title="org.apache.calcite.rel.core中的类"><code>Join</code></a>
to empty if its left child is empty.
<p>Examples:
<ul>
<li>Join(Empty, Scan(Dept), INNER) becomes Empty
<li>Join(Empty, Scan(Dept), LEFT) becomes Empty
<li>Join(Empty, Scan(Dept), SEMI) becomes Empty
<li>Join(Empty, Scan(Dept), ANTI) becomes Empty
</ul></div>
</li>
</ul>
<a name="JOIN_RIGHT_INSTANCE">
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<ul class="blockListLast">
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<h4>JOIN_RIGHT_INSTANCE</h4>
<pre>public static final&nbsp;<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="org.apache.calcite.plan中的类">RelOptRule</a> JOIN_RIGHT_INSTANCE</pre>
<div class="block">Rule that converts a <a href="../../../../../org/apache/calcite/rel/core/Join.html" title="org.apache.calcite.rel.core中的类"><code>Join</code></a>
to empty if its right child is empty.
<p>Examples:
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<li>Join(Scan(Emp), Empty, INNER) becomes Empty
<li>Join(Scan(Emp), Empty, RIGHT) becomes Empty
<li>Join(Scan(Emp), Empty, SEMI) becomes Empty
<li>Join(Scan(Emp), Empty, ANTI) becomes Scan(Emp)
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<h3>构造器详细资料</h3>
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<h4>PruneEmptyRules</h4>
<pre>public&nbsp;PruneEmptyRules()</pre>
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