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<div class="subTitle">org.apache.calcite.rel.metadata</div>
<h2 title="类 ReflectiveRelMetadataProvider" class="title">类 ReflectiveRelMetadataProvider</h2>
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<dt>所有已实现的接口:</dt>
<dd><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html" title="org.apache.calcite.rel.metadata中的接口">RelMetadataProvider</a>, <a href="../../../../../org/apache/calcite/util/ReflectiveVisitor.html" title="org.apache.calcite.util中的接口">ReflectiveVisitor</a></dd>
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<pre>public class <span class="typeNameLabel">ReflectiveRelMetadataProvider</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>
implements <a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html" title="org.apache.calcite.rel.metadata中的接口">RelMetadataProvider</a>, <a href="../../../../../org/apache/calcite/util/ReflectiveVisitor.html" title="org.apache.calcite.util中的接口">ReflectiveVisitor</a></pre>
<div class="block">Implementation of the <a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html" title="org.apache.calcite.rel.metadata中的接口"><code>RelMetadataProvider</code></a> interface that dispatches
metadata methods to methods on a given object via reflection.
<p>The methods on the target object must be public and non-static, and have
the same signature as the implemented metadata method except for an
additional first parameter of type <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口"><code>RelNode</code></a> or a sub-class. That
parameter gives this provider an indication of that relational expressions it
can handle.</p>
<p>For an example, see <a href="../../../../../org/apache/calcite/rel/metadata/RelMdColumnOrigins.html#SOURCE"><code>RelMdColumnOrigins.SOURCE</code></a>.</div>
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<h3>构造器概要</h3>
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<caption><span>构造器</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">限定符</th>
<th class="colLast" scope="col">构造器和说明</th>
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<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/ReflectiveRelMetadataProvider.html#ReflectiveRelMetadataProvider-java.util.concurrent.ConcurrentMap-java.lang.Class-com.google.common.collect.Multimap-">ReflectiveRelMetadataProvider</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentMap.html?is-external=true" title="java.util.concurrent中的类或接口">ConcurrentMap</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a>&lt;<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&gt;,<a href="../../../../../org/apache/calcite/rel/metadata/UnboundMetadata.html" title="org.apache.calcite.rel.metadata中的接口">UnboundMetadata</a>&gt;&nbsp;map,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a>&lt;? extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a>&gt;&nbsp;metadataClass0,
com.google.common.collect.Multimap&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Method.html?is-external=true" title="java.lang.reflect中的类或接口">Method</a>,<a href="../../../../../org/apache/calcite/rel/metadata/MetadataHandler.html" title="org.apache.calcite.rel.metadata中的接口">MetadataHandler</a>&gt;&nbsp;handlerMap)</code>
<div class="block">Creates a ReflectiveRelMetadataProvider.</div>
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<caption><span id="t0" class="activeTableTab"><span>所有方法</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">静态方法</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">实例方法</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">具体方法</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">限定符和类型</th>
<th class="colLast" scope="col">方法和说明</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>&lt;M extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a>&gt;<br><a href="../../../../../org/apache/calcite/rel/metadata/UnboundMetadata.html" title="org.apache.calcite.rel.metadata中的接口">UnboundMetadata</a>&lt;M&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/ReflectiveRelMetadataProvider.html#apply-java.lang.Class-">apply</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a>&lt;? extends <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&gt;&nbsp;relClass)</code>&nbsp;</td>
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<td class="colFirst"><code>&lt;M extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a>&gt;<br><a href="../../../../../org/apache/calcite/rel/metadata/UnboundMetadata.html" title="org.apache.calcite.rel.metadata中的接口">UnboundMetadata</a>&lt;M&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/ReflectiveRelMetadataProvider.html#apply-java.lang.Class-java.lang.Class-">apply</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a>&lt;? extends <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&gt;&nbsp;relClass,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a>&lt;? extends M&gt;&nbsp;metadataClass)</code>
<div class="block">Retrieves metadata of a particular type and for a particular sub-class
of relational expression.</div>
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<td class="colFirst"><code>&lt;M extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a>&gt;<br>com.google.common.collect.Multimap&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Method.html?is-external=true" title="java.lang.reflect中的类或接口">Method</a>,<a href="../../../../../org/apache/calcite/rel/metadata/MetadataHandler.html" title="org.apache.calcite.rel.metadata中的接口">MetadataHandler</a>&lt;M&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/ReflectiveRelMetadataProvider.html#handlers-org.apache.calcite.rel.metadata.MetadataDef-">handlers</a></span>(<a href="../../../../../org/apache/calcite/rel/metadata/MetadataDef.html" title="org.apache.calcite.rel.metadata中的类">MetadataDef</a>&lt;M&gt;&nbsp;def)</code>&nbsp;</td>
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<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html" title="org.apache.calcite.rel.metadata中的接口">RelMetadataProvider</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/ReflectiveRelMetadataProvider.html#reflectiveSource-org.apache.calcite.rel.metadata.MetadataHandler-java.lang.reflect.Method...-">reflectiveSource</a></span>(<a href="../../../../../org/apache/calcite/rel/metadata/MetadataHandler.html" title="org.apache.calcite.rel.metadata中的接口">MetadataHandler</a>&nbsp;target,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Method.html?is-external=true" title="java.lang.reflect中的类或接口">Method</a>...&nbsp;methods)</code>
<div class="block">Returns a reflective metadata provider that implements several
methods.</div>
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<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html" title="org.apache.calcite.rel.metadata中的接口">RelMetadataProvider</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/ReflectiveRelMetadataProvider.html#reflectiveSource-java.lang.reflect.Method-org.apache.calcite.rel.metadata.MetadataHandler-">reflectiveSource</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Method.html?is-external=true" title="java.lang.reflect中的类或接口">Method</a>&nbsp;method,
<a href="../../../../../org/apache/calcite/rel/metadata/MetadataHandler.html" title="org.apache.calcite.rel.metadata中的接口">MetadataHandler</a>&nbsp;target)</code>
<div class="block">Returns an implementation of <a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html" title="org.apache.calcite.rel.metadata中的接口"><code>RelMetadataProvider</code></a> that scans for
methods with a preceding argument.</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="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>构造器详细资料</h3>
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<h4>ReflectiveRelMetadataProvider</h4>
<pre>protected&nbsp;ReflectiveRelMetadataProvider(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentMap.html?is-external=true" title="java.util.concurrent中的类或接口">ConcurrentMap</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a>&lt;<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&gt;,<a href="../../../../../org/apache/calcite/rel/metadata/UnboundMetadata.html" title="org.apache.calcite.rel.metadata中的接口">UnboundMetadata</a>&gt;&nbsp;map,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a>&lt;? extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a>&gt;&nbsp;metadataClass0,
com.google.common.collect.Multimap&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Method.html?is-external=true" title="java.lang.reflect中的类或接口">Method</a>,<a href="../../../../../org/apache/calcite/rel/metadata/MetadataHandler.html" title="org.apache.calcite.rel.metadata中的接口">MetadataHandler</a>&gt;&nbsp;handlerMap)</pre>
<div class="block">Creates a ReflectiveRelMetadataProvider.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>map</code> - Map</dd>
<dd><code>metadataClass0</code> - Metadata class</dd>
<dd><code>handlerMap</code> - Methods handled and the objects to call them on</dd>
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<pre>public static&nbsp;<a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html" title="org.apache.calcite.rel.metadata中的接口">RelMetadataProvider</a>&nbsp;reflectiveSource(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Method.html?is-external=true" title="java.lang.reflect中的类或接口">Method</a>&nbsp;method,
<a href="../../../../../org/apache/calcite/rel/metadata/MetadataHandler.html" title="org.apache.calcite.rel.metadata中的接口">MetadataHandler</a>&nbsp;target)</pre>
<div class="block">Returns an implementation of <a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html" title="org.apache.calcite.rel.metadata中的接口"><code>RelMetadataProvider</code></a> that scans for
methods with a preceding argument.
<p>For example, <a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.Selectivity.html" title="org.apache.calcite.rel.metadata中的接口"><code>BuiltInMetadata.Selectivity</code></a> has a method
<a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.Selectivity.html#getSelectivity-org.apache.calcite.rex.RexNode-"><code>BuiltInMetadata.Selectivity.getSelectivity(RexNode)</code></a>.
A class</p>
<blockquote><pre><code>
class RelMdSelectivity {
public Double getSelectivity(Union rel, RexNode predicate) { }
public Double getSelectivity(Filter rel, RexNode predicate) { }
</code></pre></blockquote>
<p>provides implementations of selectivity for relational expressions
that extend <a href="../../../../../org/apache/calcite/rel/core/Union.html" title="org.apache.calcite.rel.core中的类"><code>Union</code></a>
or <a href="../../../../../org/apache/calcite/rel/core/Filter.html" title="org.apache.calcite.rel.core中的类"><code>Filter</code></a>.</p></div>
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<pre>public static&nbsp;<a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html" title="org.apache.calcite.rel.metadata中的接口">RelMetadataProvider</a>&nbsp;reflectiveSource(<a href="../../../../../org/apache/calcite/rel/metadata/MetadataHandler.html" title="org.apache.calcite.rel.metadata中的接口">MetadataHandler</a>&nbsp;target,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Method.html?is-external=true" title="java.lang.reflect中的类或接口">Method</a>...&nbsp;methods)</pre>
<div class="block">Returns a reflective metadata provider that implements several
methods.</div>
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<pre>public&nbsp;&lt;M extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a>&gt;&nbsp;com.google.common.collect.Multimap&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Method.html?is-external=true" title="java.lang.reflect中的类或接口">Method</a>,<a href="../../../../../org/apache/calcite/rel/metadata/MetadataHandler.html" title="org.apache.calcite.rel.metadata中的接口">MetadataHandler</a>&lt;M&gt;&gt;&nbsp;handlers(<a href="../../../../../org/apache/calcite/rel/metadata/MetadataDef.html" title="org.apache.calcite.rel.metadata中的类">MetadataDef</a>&lt;M&gt;&nbsp;def)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html#handlers-org.apache.calcite.rel.metadata.MetadataDef-">handlers</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html" title="org.apache.calcite.rel.metadata中的接口">RelMetadataProvider</a></code></dd>
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<h4>apply</h4>
<pre>public&nbsp;&lt;M extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a>&gt;&nbsp;<a href="../../../../../org/apache/calcite/rel/metadata/UnboundMetadata.html" title="org.apache.calcite.rel.metadata中的接口">UnboundMetadata</a>&lt;M&gt;&nbsp;apply(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a>&lt;? extends <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&gt;&nbsp;relClass,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a>&lt;? extends M&gt;&nbsp;metadataClass)</pre>
<div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html#apply-java.lang.Class-java.lang.Class-">RelMetadataProvider</a></code></span></div>
<div class="block">Retrieves metadata of a particular type and for a particular sub-class
of relational expression.
<p>The object returned is a function. It can be applied to a relational
expression of the given type to create a metadata object.</p>
<p>For example, you might call</p>
<blockquote><pre>
RelMetadataProvider provider;
LogicalFilter filter;
RexNode predicate;
Function&lt;RelNode, Metadata&gt; function =
provider.apply(LogicalFilter.class, Selectivity.class};
Selectivity selectivity = function.apply(filter);
Double d = selectivity.selectivity(predicate);
</pre></blockquote></div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html#apply-java.lang.Class-java.lang.Class-">apply</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.html" title="org.apache.calcite.rel.metadata中的接口">RelMetadataProvider</a></code></dd>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>relClass</code> - Type of relational expression</dd>
<dd><code>metadataClass</code> - Type of metadata</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>Function that will field a metadata instance; or null if this
provider cannot supply metadata of this type</dd>
</dl>
</li>
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<h4>apply</h4>
<pre>public&nbsp;&lt;M extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a>&gt;&nbsp;<a href="../../../../../org/apache/calcite/rel/metadata/UnboundMetadata.html" title="org.apache.calcite.rel.metadata中的接口">UnboundMetadata</a>&lt;M&gt;&nbsp;apply(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a>&lt;? extends <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&gt;&nbsp;relClass)</pre>
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