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<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.rel.metadata</a></div>
<h1 title="Interface BuiltInMetadata.Size" class="title">Interface BuiltInMetadata.Size</h1>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>All Superinterfaces:</dt>
<dd><code><a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a></code></dd>
</dl>
<dl class="notes">
<dt>Enclosing class:</dt>
<dd><a href="BuiltInMetadata.html" title="class in org.apache.calcite.rel.metadata">BuiltInMetadata</a></dd>
</dl>
<hr>
<div class="type-signature"><span class="modifiers">public static interface </span><span class="element-name type-name-label">BuiltInMetadata.Size</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 size of rows and columns.</div>
</section>
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<section class="nested-class-summary" id="nested-class-summary">
<h2>Nested Class Summary</h2>
<div class="caption"><span>Nested Classes</span></div>
<div class="summary-table three-column-summary">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Interface</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color"><code>static interface&nbsp;</code></div>
<div class="col-second even-row-color"><code><a href="BuiltInMetadata.Size.Handler.html" class="type-name-link" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.Size.Handler</a></code></div>
<div class="col-last even-row-color">
<div class="block">Handler API.</div>
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</section>
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<h2>Field Summary</h2>
<div class="caption"><span>Fields</span></div>
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<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Field</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color"><code>static final <a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a>&lt;<a href="BuiltInMetadata.Size.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.Size</a>&gt;</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">&nbsp;</div>
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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><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;@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>&gt;</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#averageColumnSizes()" class="member-name-link">averageColumnSizes</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Determines the average size (in bytes) of a value of a column in this
relational expression.</div>
</div>
<div class="col-first odd-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 odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#averageRowSize()" class="member-name-link">averageRowSize</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Determines the average size (in bytes) of a row from this 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&nbsp;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>
</section>
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<section class="field-details" id="field-detail">
<h2>Field Details</h2>
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<li>
<section class="detail" id="DEF">
<h3>DEF</h3>
<div class="member-signature"><span class="modifiers">static final</span>&nbsp;<span class="return-type"><a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a>&lt;<a href="BuiltInMetadata.Size.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.Size</a>&gt;</span>&nbsp;<span class="element-name">DEF</span></div>
</section>
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<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="averageRowSize()">
<h3>averageRowSize</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>&nbsp;<span class="element-name">averageRowSize</span>()</div>
<div class="block">Determines the average size (in bytes) of a row from this relational
expression.</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>average size of a row, in bytes, or null if not known</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="averageColumnSizes()">
<h3>averageColumnSizes</h3>
<div class="member-signature"><span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;@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>&gt;</span>&nbsp;<span class="element-name">averageColumnSizes</span>()</div>
<div class="block">Determines the average size (in bytes) of a value of a column in this
relational expression.
<p>Null values are included (presumably they occupy close to 0 bytes).
<p>It is left to the caller to decide whether the size is the compressed
size, the uncompressed size, or memory allocation when the value is
wrapped in an object in the Java heap. The uncompressed size is probably
a good compromise.</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>an immutable list containing, for each column, the average size
of a column value, in bytes. Each value or the entire list may be null if
the metadata is not available</dd>
</dl>
</section>
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