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| <h2 title="接口 BuiltInMetadata.MaxRowCount" class="title">接口 BuiltInMetadata.MaxRowCount</h2> |
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| <pre>public static interface <span class="typeNameLabel">BuiltInMetadata.MaxRowCount</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 maximum number of rows returned by a relational |
| expression.</div> |
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| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.MaxRowCount.Handler.html" title="org.apache.calcite.rel.metadata中的接口">BuiltInMetadata.MaxRowCount.Handler</a></span></code> |
| <div class="block">Handler API.</div> |
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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.MaxRowCount.html" title="org.apache.calcite.rel.metadata中的接口">BuiltInMetadata.MaxRowCount</a>></code></td> |
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| <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.MaxRowCount.html#getMaxRowCount--">getMaxRowCount</a></span>()</code> |
| <div class="block">Estimates the max number of rows which will be returned by a relational |
| expression.</div> |
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| <code><a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html#rel--">rel</a></code></li> |
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| <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.MaxRowCount.html" title="org.apache.calcite.rel.metadata中的接口">BuiltInMetadata.MaxRowCount</a>> DEF</pre> |
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| <h4>getMaxRowCount</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> getMaxRowCount()</pre> |
| <div class="block">Estimates the max number of rows which will be returned by a relational |
| expression. |
| |
| <p>The default implementation for this query returns |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true#POSITIVE_INFINITY" title="java.lang中的类或接口"><code>Double.POSITIVE_INFINITY</code></a>, |
| but metadata providers can override this with their own cost models.</div> |
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| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>upper bound on the number of rows returned</dd> |
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