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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="RelMetadataQuery.html" title="class in org.apache.calcite.rel.metadata"><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 |
| <code>Object.equals(Object)</code> and <code>Object.hashCode()</code> methods. This |
| makes the cache of <a href="JaninoRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata"><code>JaninoRelMetadataProvider</code></a> more effective.</div> |
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| <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><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> |
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| <h4>apply</h4> |
| <pre class="methodSignature"><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">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">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> |
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| <h4>handlers</h4> |
| <pre class="methodSignature"><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> |
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