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| <h2 title="Class ChainedRelMetadataProvider" class="title">Class ChainedRelMetadataProvider</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <ul class="inheritance"> |
| <li>org.apache.calcite.rel.metadata.ChainedRelMetadataProvider</li> |
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| <dd><code><a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a></code></dd> |
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| <dt>Direct Known Subclasses:</dt> |
| <dd><code><a href="DefaultRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata">DefaultRelMetadataProvider</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public class <span class="typeNameLabel">ChainedRelMetadataProvider</span> |
| extends java.lang.Object |
| implements <a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a></pre> |
| <div class="block">Implementation of the <a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata"><code>RelMetadataProvider</code></a> |
| interface via the |
| <a href="../../util/Glossary.html#CHAIN_OF_RESPONSIBILITY_PATTERN"><code>Glossary.CHAIN_OF_RESPONSIBILITY_PATTERN</code></a>. |
| |
| <p>When a consumer calls the <a href="#apply(java.lang.Class,java.lang.Class)"><code>apply(java.lang.Class<? extends org.apache.calcite.rel.RelNode>, java.lang.Class<? extends M>)</code></a> method to ask for a provider |
| for a particular type of <a href="../RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a> and <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata"><code>Metadata</code></a>, scans the list |
| of underlying providers.</p></div> |
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| <table class="memberSummary"> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ChainedRelMetadataProvider.ChainedInvocationHandler.html" title="class in org.apache.calcite.rel.metadata">ChainedRelMetadataProvider.ChainedInvocationHandler</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Invocation handler that calls a list of <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata"><code>Metadata</code></a> objects, |
| returning the first non-null value.</div> |
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| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private com.google.common.collect.ImmutableList<<a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#providers">providers</a></span></code></th> |
| <td class="colLast"> </td> |
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| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected </code></td> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(com.google.common.collect.ImmutableList)">ChainedRelMetadataProvider</a></span>​(com.google.common.collect.ImmutableList<<a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a>> providers)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a chain.</div> |
| </td> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><M extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>><br><a href="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="../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="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>><br>com.google.common.collect.Multimap<java.lang.reflect.Method,​<a href="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="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> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static <a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#of(java.util.List)">of</a></span>​(java.util.List<<a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a>> list)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a chain.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
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| <!-- ============ FIELD DETAIL =========== --> |
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| <!-- --> |
| </a> |
| <h3>Field Detail</h3> |
| <a id="providers"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>providers</h4> |
| <pre>private final com.google.common.collect.ImmutableList<<a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a>> providers</pre> |
| </li> |
| </ul> |
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| </ul> |
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| <!-- --> |
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| <h3>Constructor Detail</h3> |
| <a id="<init>(com.google.common.collect.ImmutableList)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>ChainedRelMetadataProvider</h4> |
| <pre>protected ChainedRelMetadataProvider​(com.google.common.collect.ImmutableList<<a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a>> providers)</pre> |
| <div class="block">Creates a chain.</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <li class="blockList"> |
| <h4>equals</h4> |
| <pre class="methodSignature">public boolean equals​(java.lang.Object obj)</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code>equals</code> in class <code>java.lang.Object</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="hashCode()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>hashCode</h4> |
| <pre class="methodSignature">public int hashCode()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code>hashCode</code> in class <code>java.lang.Object</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="apply(java.lang.Class,java.lang.Class)"> |
| <!-- --> |
| </a> |
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| <li class="blockList"> |
| <h4>apply</h4> |
| <pre class="methodSignature">public <M extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>> <a href="UnboundMetadata.html" title="interface in org.apache.calcite.rel.metadata">UnboundMetadata</a><M> apply​(java.lang.Class<? extends <a href="../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="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="RelMetadataProvider.html#apply(java.lang.Class,java.lang.Class)">apply</a></code> in interface <code><a href="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> |
| <a id="handlers(org.apache.calcite.rel.metadata.MetadataDef)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>handlers</h4> |
| <pre class="methodSignature">public <M extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>> com.google.common.collect.Multimap<java.lang.reflect.Method,​<a href="MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a><M>> handlers​(<a href="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="RelMetadataProvider.html#handlers(org.apache.calcite.rel.metadata.MetadataDef)">handlers</a></code> in interface <code><a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="of(java.util.List)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>of</h4> |
| <pre class="methodSignature">public static <a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a> of​(java.util.List<<a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a>> list)</pre> |
| <div class="block">Creates a chain.</div> |
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