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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rel.metadata</a></div> |
| <h2 title="Interface BuiltInMetadata.Size" class="title">Interface BuiltInMetadata.Size</h2> |
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| <pre>public static interface <span class="typeNameLabel">BuiltInMetadata.Size</span> |
| extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a></pre> |
| <div class="block">Metadata about the size of rows and columns.</div> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="BuiltInMetadata.Size.Handler.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.Size.Handler</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Handler API.</div> |
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| <td class="colFirst"><code>static <a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><<a href="BuiltInMetadata.Size.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.Size</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEF">DEF</a></span></code></th> |
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| <td class="colFirst"><code>java.util.List<java.lang.Double></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#averageColumnSizes()">averageColumnSizes</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Determines the average size (in bytes) of a value of a column in this |
| relational expression.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>java.lang.Double</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#averageRowSize()">averageRowSize</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Determines the average size (in bytes) of a row from this relational |
| expression.</div> |
| </td> |
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| <h3>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></li> |
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| <h4>DEF</h4> |
| <pre>static final <a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><<a href="BuiltInMetadata.Size.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.Size</a>> DEF</pre> |
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| <h4>averageRowSize</h4> |
| <pre class="methodSignature">java.lang.Double averageRowSize()</pre> |
| <div class="block">Determines the average size (in bytes) of a row from this relational |
| expression.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>average size of a row, in bytes, or null if not known</dd> |
| </dl> |
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| <h4>averageColumnSizes</h4> |
| <pre class="methodSignature">java.util.List<java.lang.Double> averageColumnSizes()</pre> |
| <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> |
| <dt><span class="returnLabel">Returns:</span></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> |
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