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| <h2 title="类 Profiler.Distribution" class="title">类 Profiler.Distribution</h2> |
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| <li>org.apache.calcite.profile.Profiler.Distribution</li> |
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| <dt>所有已实现的接口:</dt> |
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| <dt>封闭接口:</dt> |
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| <pre>public static class <span class="typeNameLabel">Profiler.Distribution</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a> |
| implements <a href="../../../../org/apache/calcite/profile/Profiler.Statistic.html" title="org.apache.calcite.profile中的接口">Profiler.Statistic</a></pre> |
| <div class="block">Value distribution, including cardinality and optionally values, of a |
| column or set of columns. If the set of columns is empty, it describes |
| the number of rows in the entire data set.</div> |
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| <h3>构造器概要</h3> |
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| <th class="colOne" scope="col">构造器和说明</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/profile/Profiler.Distribution.html#Distribution-java.util.SortedSet-java.util.SortedSet-double-int-double-boolean-">Distribution</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/SortedSet.html?is-external=true" title="java.util中的类或接口">SortedSet</a><<a href="../../../../org/apache/calcite/profile/Profiler.Column.html" title="org.apache.calcite.profile中的类">Profiler.Column</a>> columns, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/SortedSet.html?is-external=true" title="java.util中的类或接口">SortedSet</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="java.lang中的类或接口">Comparable</a>> values, |
| double cardinality, |
| int nullCount, |
| double expectedCardinality, |
| boolean minimal)</code> |
| <div class="block">Creates a Distribution.</div> |
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| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/profile/Profiler.Distribution.html#toMap-org.apache.calcite.util.JsonBuilder-">toMap</a></span>(<a href="../../../../org/apache/calcite/util/JsonBuilder.html" title="org.apache.calcite.util中的类">JsonBuilder</a> jsonBuilder)</code> </td> |
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| <h3>构造器详细资料</h3> |
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| <h4>Distribution</h4> |
| <pre>public Distribution(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/SortedSet.html?is-external=true" title="java.util中的类或接口">SortedSet</a><<a href="../../../../org/apache/calcite/profile/Profiler.Column.html" title="org.apache.calcite.profile中的类">Profiler.Column</a>> columns, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/SortedSet.html?is-external=true" title="java.util中的类或接口">SortedSet</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="java.lang中的类或接口">Comparable</a>> values, |
| double cardinality, |
| int nullCount, |
| double expectedCardinality, |
| boolean minimal)</pre> |
| <div class="block">Creates a Distribution.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>columns</code> - Column or columns being described</dd> |
| <dd><code>values</code> - Values of columns, or null if there are too many</dd> |
| <dd><code>cardinality</code> - Number of distinct values</dd> |
| <dd><code>nullCount</code> - Number of rows where this column had a null value;</dd> |
| <dd><code>expectedCardinality</code> - Expected cardinality</dd> |
| <dd><code>minimal</code> - Whether the distribution is not implied by a unique |
| or functional dependency</dd> |
| </dl> |
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| <h4>toMap</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a> toMap(<a href="../../../../org/apache/calcite/util/JsonBuilder.html" title="org.apache.calcite.util中的类">JsonBuilder</a> jsonBuilder)</pre> |
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