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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 BuiltInMetadata.RowCount" class="title">Interface BuiltInMetadata.RowCount</h1> |
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| <section class="class-description" id="class-description"> |
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| <dt>All Superinterfaces:</dt> |
| <dd><code><a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a></code></dd> |
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| <dl class="notes"> |
| <dt>Enclosing class:</dt> |
| <dd><a href="BuiltInMetadata.html" title="class in org.apache.calcite.rel.metadata">BuiltInMetadata</a></dd> |
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| <div class="type-signature"><span class="modifiers">public static interface </span><span class="element-name type-name-label">BuiltInMetadata.RowCount</span><span class="extends-implements"> |
| extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a></span></div> |
| <div class="block">Metadata about the number of rows returned by a relational expression.</div> |
| </section> |
| <section class="summary"> |
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| <div class="col-first even-row-color"><code>static interface </code></div> |
| <div class="col-second even-row-color"><code><a href="BuiltInMetadata.RowCount.Handler.html" class="type-name-link" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.RowCount.Handler</a></code></div> |
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| <div class="block">Handler API.</div> |
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| <div class="col-first even-row-color"><code>static final <a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><<a href="BuiltInMetadata.RowCount.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.RowCount</a>></code></div> |
| <div class="col-second even-row-color"><code><a href="#DEF" class="member-name-link">DEF</a></code></div> |
| <div class="col-last even-row-color"> </div> |
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| <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 <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Double.html" title="class or interface in java.lang" class="external-link">Double</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getRowCount()" class="member-name-link">getRowCount</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Estimates the number of rows which will be returned by a relational |
| expression.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-org.apache.calcite.rel.metadata.Metadata">Methods inherited from interface org.apache.calcite.rel.metadata.<a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a></h3> |
| <code><a href="Metadata.html#rel()">rel</a></code></div> |
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| <h2>Field Details</h2> |
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| <section class="detail" id="DEF"> |
| <h3>DEF</h3> |
| <div class="member-signature"><span class="modifiers">static final</span> <span class="return-type"><a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><<a href="BuiltInMetadata.RowCount.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.RowCount</a>></span> <span class="element-name">DEF</span></div> |
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| </section> |
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| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
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| <li> |
| <section class="detail" id="getRowCount()"> |
| <h3>getRowCount</h3> |
| <div class="member-signature"><span class="return-type">@Nullable <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Double.html" title="class or interface in java.lang" class="external-link">Double</a></span> <span class="element-name">getRowCount</span>()</div> |
| <div class="block">Estimates the number of rows which will be returned by a relational |
| expression. The default implementation for this query asks the rel itself |
| via <a href="../RelNode.html#estimateRowCount(org.apache.calcite.rel.metadata.RelMetadataQuery)"><code>RelNode.estimateRowCount(org.apache.calcite.rel.metadata.RelMetadataQuery)</code></a>, but metadata providers can override this |
| with their own cost models.</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>estimated row count, or null if no reliable estimate can be |
| determined</dd> |
| </dl> |
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