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| <h2 title="接口 BuiltInMetadata.Size" class="title">接口 BuiltInMetadata.Size</h2> |
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| <dl> |
| <dt>所有超级接口:</dt> |
| <dd><a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a></dd> |
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| <pre>public static interface <span class="typeNameLabel">BuiltInMetadata.Size</span> |
| extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a></pre> |
| <div class="block">Metadata about the size of rows and columns.</div> |
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| <tr> |
| <th class="colFirst" scope="col">限定符和类型</th> |
| <th class="colLast" scope="col">接口和说明</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.Size.Handler.html" title="org.apache.calcite.rel.metadata中的接口">BuiltInMetadata.Size.Handler</a></span></code> |
| <div class="block">Handler API.</div> |
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| <h3>字段概要</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="字段概要表, 列表字段和解释"> |
| <caption><span>字段</span><span class="tabEnd"> </span></caption> |
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| <th class="colFirst" scope="col">限定符和类型</th> |
| <th class="colLast" scope="col">字段和说明</th> |
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| <td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/rel/metadata/MetadataDef.html" title="org.apache.calcite.rel.metadata中的类">MetadataDef</a><<a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.Size.html" title="org.apache.calcite.rel.metadata中的接口">BuiltInMetadata.Size</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.Size.html#DEF">DEF</a></span></code> </td> |
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| <tr> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="java.lang中的类或接口">Double</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.Size.html#averageColumnSizes--">averageColumnSizes</a></span>()</code> |
| <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><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="java.lang中的类或接口">Double</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.Size.html#averageRowSize--">averageRowSize</a></span>()</code> |
| <div class="block">Determines the average size (in bytes) of a row from this relational |
| expression.</div> |
| </td> |
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| <h3>从接口继承的方法 org.apache.calcite.rel.metadata.<a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a></h3> |
| <code><a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html#rel--">rel</a></code></li> |
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| <h4>DEF</h4> |
| <pre>static final <a href="../../../../../org/apache/calcite/rel/metadata/MetadataDef.html" title="org.apache.calcite.rel.metadata中的类">MetadataDef</a><<a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.Size.html" title="org.apache.calcite.rel.metadata中的接口">BuiltInMetadata.Size</a>> DEF</pre> |
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| <h4>averageRowSize</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="java.lang中的类或接口">Double</a> averageRowSize()</pre> |
| <div class="block">Determines the average size (in bytes) of a row from this relational |
| expression.</div> |
| <dl> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>average size of a row, in bytes, or null if not known</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="averageColumnSizes--"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
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| <h4>averageColumnSizes</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="java.lang中的类或接口">Double</a>> 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">返回:</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> |
| </dl> |
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