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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rel.metadata</a></div> |
| <h1 title="Class ReflectiveRelMetadataProvider" class="title">Class ReflectiveRelMetadataProvider</h1> |
| </div> |
| <div class="contentContainer"> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">java.lang.Object</a> |
| <div class="inheritance">org.apache.calcite.rel.metadata.ReflectiveRelMetadataProvider</div> |
| </div> |
| <section class="description"> |
| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><code><a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a></code>, <code><a href="../../util/ReflectiveVisitor.html" title="interface in org.apache.calcite.util">ReflectiveVisitor</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public class <span class="typeNameLabel">ReflectiveRelMetadataProvider</span> |
| extends <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a> |
| implements <a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a>, <a href="../../util/ReflectiveVisitor.html" title="interface in org.apache.calcite.util">ReflectiveVisitor</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 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="../RelNode.html" title="interface in org.apache.calcite.rel"><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="RelMdColumnOrigins.html#SOURCE"><code>RelMdColumnOrigins.SOURCE</code></a>.</div> |
| </section> |
| <section class="summary"> |
| <ul class="blockList"> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <li class="blockList"> |
| <section class="constructorSummary"><a id="constructor.summary"> |
| <!-- --> |
| </a> |
| <h2>Constructor Summary</h2> |
| <div class="memberSummary"> |
| <table> |
| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <thead> |
| <tr> |
| <th class="colFirst" scope="col">Modifier</th> |
| <th class="colSecond" scope="col">Constructor</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected </code></td> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.util.concurrent.ConcurrentMap,java.lang.Class,com.google.common.collect.Multimap)">ReflectiveRelMetadataProvider</a></span>​(<a href="https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/ConcurrentMap.html?is-external=true" title="class or interface in java.util.concurrent" class="externalLink">ConcurrentMap</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>>,​<a href="UnboundMetadata.html" title="interface in org.apache.calcite.rel.metadata">UnboundMetadata</a>> map, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><? extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>> metadataClass0, |
| com.google.common.collect.Multimap<<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Method.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Method</a>,​<a href="MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a>> handlerMap)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a ReflectiveRelMetadataProvider.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li class="blockList"> |
| <section class="methodSummary"><a id="method.summary"> |
| <!-- --> |
| </a> |
| <h2>Method Summary</h2> |
| <div class="memberSummary"> |
| <div role="tablist" aria-orientation="horizontal"><button role="tab" aria-selected="true" aria-controls="memberSummary_tabpanel" tabindex="0" onkeydown="switchTab(event)" id="t0" class="activeTableTab">All Methods</button><button role="tab" aria-selected="false" aria-controls="memberSummary_tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t1" class="tableTab" onclick="show(1);">Static Methods</button><button role="tab" aria-selected="false" aria-controls="memberSummary_tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t2" class="tableTab" onclick="show(2);">Instance Methods</button><button role="tab" aria-selected="false" aria-controls="memberSummary_tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t4" class="tableTab" onclick="show(8);">Concrete Methods</button></div> |
| <div id="memberSummary_tabpanel" role="tabpanel"> |
| <table aria-labelledby="t0"> |
| <thead> |
| <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> |
| </thead> |
| <tbody> |
| <tr class="altColor" id="i0"> |
| <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)">apply</a></span>​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><? extends <a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>> relClass)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor" id="i1"> |
| <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>​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><? extends <a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>> relClass, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><? 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 class="altColor" id="i2"> |
| <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<<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Method.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Method</a>,​<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 class="rowColor" id="i3"> |
| <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="#reflectiveSource(java.lang.reflect.Method,org.apache.calcite.rel.metadata.MetadataHandler)">reflectiveSource</a></span>​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Method.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Method</a> method, |
| <a href="MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a> target)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns an implementation of <a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata"><code>RelMetadataProvider</code></a> that scans for |
| methods with a preceding argument.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i4"> |
| <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="#reflectiveSource(org.apache.calcite.rel.metadata.MetadataHandler,java.lang.reflect.Method...)">reflectiveSource</a></span>​(<a href="MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a> target, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Method.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Method</a>... methods)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns a reflective metadata provider that implements several |
| methods.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="inheritedList"> |
| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></h3> |
| <a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink">toString</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="blockList"> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <section class="constructorDetails"><a id="constructor.detail"> |
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| <h2>Constructor Details</h2> |
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| <section class="detail"> |
| <h3><a id="<init>(java.util.concurrent.ConcurrentMap,java.lang.Class,com.google.common.collect.Multimap)">ReflectiveRelMetadataProvider</a></h3> |
| <div class="memberSignature"><span class="modifiers">protected</span> <span class="memberName">ReflectiveRelMetadataProvider</span>​(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/ConcurrentMap.html?is-external=true" title="class or interface in java.util.concurrent" class="externalLink">ConcurrentMap</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>>,​<a href="UnboundMetadata.html" title="interface in org.apache.calcite.rel.metadata">UnboundMetadata</a>> map, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><? extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>> metadataClass0, |
| com.google.common.collect.Multimap<<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Method.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Method</a>,​<a href="MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a>> handlerMap)</span></div> |
| <div class="block">Creates a ReflectiveRelMetadataProvider.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</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> |
| </dl> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li class="blockList"> |
| <section class="methodDetails"><a id="method.detail"> |
| <!-- --> |
| </a> |
| <h2>Method Details</h2> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="reflectiveSource(java.lang.reflect.Method,org.apache.calcite.rel.metadata.MetadataHandler)">reflectiveSource</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static</span> <span class="returnType"><a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a></span> <span class="memberName">reflectiveSource</span>​(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Method.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Method</a> method, |
| <a href="MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a> target)</span></div> |
| <div class="block">Returns an implementation of <a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata"><code>RelMetadataProvider</code></a> that scans for |
| methods with a preceding argument. |
| |
| <p>For example, <a href="BuiltInMetadata.Selectivity.html" title="interface in org.apache.calcite.rel.metadata"><code>BuiltInMetadata.Selectivity</code></a> has a method |
| <a href="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="../core/Union.html" title="class in org.apache.calcite.rel.core"><code>Union</code></a> |
| or <a href="../core/Filter.html" title="class in org.apache.calcite.rel.core"><code>Filter</code></a>.</p></div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="reflectiveSource(org.apache.calcite.rel.metadata.MetadataHandler,java.lang.reflect.Method...)">reflectiveSource</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static</span> <span class="returnType"><a href="RelMetadataProvider.html" title="interface in org.apache.calcite.rel.metadata">RelMetadataProvider</a></span> <span class="memberName">reflectiveSource</span>​(<span class="arguments"><a href="MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a> target, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Method.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Method</a>... methods)</span></div> |
| <div class="block">Returns a reflective metadata provider that implements several |
| methods.</div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="handlers(org.apache.calcite.rel.metadata.MetadataDef)">handlers</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="typeParameters"><M extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>></span> |
| <span class="returnType">com.google.common.collect.Multimap<<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Method.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Method</a>,​<a href="MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a><M>></span> <span class="memberName">handlers</span>​(<span class="arguments"><a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><M> def)</span></div> |
| <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> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="apply(java.lang.Class,java.lang.Class)">apply</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="typeParameters"><M extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>></span> <span class="returnType"><a href="UnboundMetadata.html" title="interface in org.apache.calcite.rel.metadata">UnboundMetadata</a><M></span> <span class="memberName">apply</span>​(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><? extends <a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>> relClass, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><? extends M> metadataClass)</span></div> |
| <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> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="apply(java.lang.Class)">apply</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="typeParameters"><M extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>></span> <span class="returnType"><a href="UnboundMetadata.html" title="interface in org.apache.calcite.rel.metadata">UnboundMetadata</a><M></span> <span class="memberName">apply</span>​(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><? extends <a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>> relClass)</span></div> |
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