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| <li>Summary: </li> |
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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.calcite.rel.metadata</a></div> |
| <h1 title="Interface MetadataFactory" class="title">Interface MetadataFactory</h1> |
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| <section class="class-description" id="class-description"> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="MetadataFactoryImpl.html" title="class in org.apache.calcite.rel.metadata">MetadataFactoryImpl</a></code></dd> |
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| <div class="type-signature"><span class="modifiers">public interface </span><span class="element-name type-name-label">MetadataFactory</span></div> |
| <div class="block">Source of metadata about relational expressions. |
| |
| <p>The metadata is typically various kinds of statistics used to estimate |
| costs.</p> |
| |
| <p>Each kind of metadata has an interface that extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata"><code>Metadata</code></a> and |
| has a method. Some examples: <a href="BuiltInMetadata.Selectivity.html" title="interface in org.apache.calcite.rel.metadata"><code>BuiltInMetadata.Selectivity</code></a>, |
| <a href="BuiltInMetadata.ColumnUniqueness.html" title="interface in org.apache.calcite.rel.metadata"><code>BuiltInMetadata.ColumnUniqueness</code></a>.</p></div> |
| </section> |
| <section class="summary"> |
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| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
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| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><@Nullable M extends @Nullable <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>><br>M</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#query(org.apache.calcite.rel.RelNode,org.apache.calcite.rel.metadata.RelMetadataQuery,java.lang.Class)" class="member-name-link">query</a><wbr>(<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel, |
| <a href="RelMetadataQuery.html" title="class in org.apache.calcite.rel.metadata">RelMetadataQuery</a> mq, |
| <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link">Class</a><@Nullable M> metadataClazz)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Returns a metadata interface to get a particular kind of metadata |
| from a particular relational expression.</div> |
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| <section class="details"> |
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| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
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| <li> |
| <section class="detail" id="query(org.apache.calcite.rel.RelNode,org.apache.calcite.rel.metadata.RelMetadataQuery,java.lang.Class)"> |
| <h3>query</h3> |
| <div class="member-signature"><span class="type-parameters"><@Nullable M extends @Nullable <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>></span> <span class="return-type">M</span> <span class="element-name">query</span><wbr><span class="parameters">(<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel, |
| <a href="RelMetadataQuery.html" title="class in org.apache.calcite.rel.metadata">RelMetadataQuery</a> mq, |
| <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link">Class</a><@Nullable M> metadataClazz)</span></div> |
| <div class="block">Returns a metadata interface to get a particular kind of metadata |
| from a particular relational expression. Returns null if that kind of |
| metadata is not available.</div> |
| <dl class="notes"> |
| <dt>Type Parameters:</dt> |
| <dd><code>M</code> - Metadata type</dd> |
| <dt>Parameters:</dt> |
| <dd><code>rel</code> - Relational expression</dd> |
| <dd><code>mq</code> - Metadata query</dd> |
| <dd><code>metadataClazz</code> - Metadata class</dd> |
| <dt>Returns:</dt> |
| <dd>Metadata bound to <code>rel</code> and <code>query</code></dd> |
| </dl> |
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