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| <h2 title="接口 RelMetadataProvider" class="title">接口 RelMetadataProvider</h2> |
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| <pre>public interface <span class="typeNameLabel">RelMetadataProvider</span></pre> |
| <div class="block">RelMetadataProvider defines an interface for obtaining metadata about |
| relational expressions. This interface is weakly-typed and is not intended to |
| be called directly in most contexts; instead, use a strongly-typed facade |
| such as <a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQuery.html" title="org.apache.calcite.rel.metadata中的类"><code>RelMetadataQuery</code></a>. |
| |
| <p>For background and motivation, see <a |
| href="http://wiki.eigenbase.org/RelationalExpressionMetadata">wiki</a>. |
| |
| <p>If your provider is not a singleton, we recommend that you implement |
| <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"><code>Object.equals(Object)</code></a> and <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"><code>Object.hashCode()</code></a> methods. This |
| makes the cache of <a href="../../../../../org/apache/calcite/rel/metadata/JaninoRelMetadataProvider.html" title="org.apache.calcite.rel.metadata中的类"><code>JaninoRelMetadataProvider</code></a> more effective.</div> |
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| <caption><span id="t0" class="activeTableTab"><span>所有方法</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">实例方法</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">抽象方法</a></span><span class="tabEnd"> </span></span></caption> |
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| <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><M extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a>><br><a href="../../../../../org/apache/calcite/rel/metadata/UnboundMetadata.html" title="org.apache.calcite.rel.metadata中的接口">UnboundMetadata</a><M></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.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><? extends <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>> 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><? extends M> metadataClass)</code> |
| <div class="block">Retrieves metadata of a particular type and for a particular sub-class |
| of relational expression.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><M extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a>><br>com.google.common.collect.Multimap<<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><M>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataProvider.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><M> def)</code> </td> |
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| <h4>apply</h4> |
| <pre><M extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a>> <a href="../../../../../org/apache/calcite/rel/metadata/UnboundMetadata.html" title="org.apache.calcite.rel.metadata中的接口">UnboundMetadata</a><M> 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><? extends <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>> 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><? extends M> metadataClass)</pre> |
| <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<RelNode, Metadata> function = |
| provider.apply(LogicalFilter.class, Selectivity.class}; |
| Selectivity selectivity = function.apply(filter); |
| Double d = selectivity.selectivity(predicate); |
| </pre></blockquote></div> |
| <dl> |
| <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>handlers</h4> |
| <pre><M extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a>> com.google.common.collect.Multimap<<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><M>> handlers(<a href="../../../../../org/apache/calcite/rel/metadata/MetadataDef.html" title="org.apache.calcite.rel.metadata中的类">MetadataDef</a><M> def)</pre> |
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