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| <h2 title="Class VolcanoRelMetadataProvider" class="title">Class VolcanoRelMetadataProvider</h2> |
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| <li>java.lang.Object</li> |
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| <dd><code><a href="../../rel/metadata/RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a></code></dd> |
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| <pre>public class <span class="typeNameLabel">VolcanoRelMetadataProvider</span> |
| extends java.lang.Object |
| implements <a href="../../rel/metadata/RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a></pre> |
| <div class="block">VolcanoRelMetadataProvider implements the <a href="../../rel/metadata/RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata"><code>RelMetadataProvider</code></a> |
| interface by combining metadata from the rels making up an equivalence class.</div> |
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| <th class="colFirst" scope="col">Constructor</th> |
| <th class="colLast" scope="col">Description</th> |
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| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">VolcanoRelMetadataProvider</a></span>()</code></th> |
| <td class="colLast"> </td> |
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| <td class="colFirst"><code><M extends <a href="../../rel/metadata/Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>><br><a href="../../rel/metadata/UnboundMetadata.html" title="interface in org.apache.calcite.rel.metadata">UnboundMetadata</a><M></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#apply(java.lang.Class,java.lang.Class)">apply</a></span>​(java.lang.Class<? extends <a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>> relClass, |
| java.lang.Class<? extends M> metadataClass)</code></th> |
| <td class="colLast"> |
| <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>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#equals(java.lang.Object)">equals</a></span>​(java.lang.Object obj)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><M extends <a href="../../rel/metadata/Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>><br>com.google.common.collect.Multimap<java.lang.reflect.Method,​<a href="../../rel/metadata/MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a><M>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#handlers(org.apache.calcite.rel.metadata.MetadataDef)">handlers</a></span>​(<a href="../../rel/metadata/MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><M> def)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#hashCode()">hashCode</a></span>()</code></th> |
| <td class="colLast"> </td> |
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| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait</code></li> |
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| <h4>VolcanoRelMetadataProvider</h4> |
| <pre>public VolcanoRelMetadataProvider()</pre> |
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| <pre class="methodSignature">public boolean equals​(java.lang.Object obj)</pre> |
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| <dd><code>equals</code> in class <code>java.lang.Object</code></dd> |
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| <h4>apply</h4> |
| <pre class="methodSignature">public <M extends <a href="../../rel/metadata/Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>> <a href="../../rel/metadata/UnboundMetadata.html" title="interface in org.apache.calcite.rel.metadata">UnboundMetadata</a><M> apply​(java.lang.Class<? extends <a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>> relClass, |
| java.lang.Class<? extends M> metadataClass)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../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<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="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../rel/metadata/RelMetadataProvider.html#apply(java.lang.Class,java.lang.Class)">apply</a></code> in interface <code><a href="../../rel/metadata/RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>relClass</code> - Type of relational expression</dd> |
| <dd><code>metadataClass</code> - Type of metadata</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Function that will field a metadata instance; or null if this |
| provider cannot supply metadata of this type</dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- --> |
| </a> |
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| <h4>handlers</h4> |
| <pre class="methodSignature">public <M extends <a href="../../rel/metadata/Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>> com.google.common.collect.Multimap<java.lang.reflect.Method,​<a href="../../rel/metadata/MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a><M>> handlers​(<a href="../../rel/metadata/MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><M> def)</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../rel/metadata/RelMetadataProvider.html#handlers(org.apache.calcite.rel.metadata.MetadataDef)">handlers</a></code> in interface <code><a href="../../rel/metadata/RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a></code></dd> |
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