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| <pre>public interface <span class="typeNameLabel">Statistic</span></pre> |
| <div class="block">Statistics about a <a href="../../../../org/apache/calcite/schema/Table.html" title="org.apache.calcite.schema中的接口"><code>Table</code></a>. |
| |
| <p>Each of the methods may return <code>null</code> meaning "not known".</p></div> |
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| <h3>方法概要</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="方法概要表, 列表方法和解释"> |
| <caption><span id="t0" class="activeTableTab"><span>所有方法</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">实例方法</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">抽象方法</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">限定符和类型</th> |
| <th class="colLast" scope="col">方法和说明</th> |
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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="../../../../org/apache/calcite/rel/RelCollation.html" title="org.apache.calcite.rel中的接口">RelCollation</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Statistic.html#getCollations--">getCollations</a></span>()</code> |
| <div class="block">Returns the collections of columns on which this table is sorted.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/calcite/rel/RelDistribution.html" title="org.apache.calcite.rel中的接口">RelDistribution</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Statistic.html#getDistribution--">getDistribution</a></span>()</code> |
| <div class="block">Returns the distribution of the data in this table.</div> |
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| <tr id="i2" 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="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Statistic.html#getKeys--">getKeys</a></span>()</code> |
| <div class="block">Returns a list of unique keys, or null if no key exist.</div> |
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| <tr id="i3" class="rowColor"> |
| <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="../../../../org/apache/calcite/rel/RelReferentialConstraint.html" title="org.apache.calcite.rel中的接口">RelReferentialConstraint</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Statistic.html#getReferentialConstraints--">getReferentialConstraints</a></span>()</code> |
| <div class="block">Returns the collection of referential constraints (foreign-keys) |
| for this table.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <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/schema/Statistic.html#getRowCount--">getRowCount</a></span>()</code> |
| <div class="block">Returns the approximate number of rows in the table.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Statistic.html#isKey-org.apache.calcite.util.ImmutableBitSet-">isKey</a></span>(<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a> columns)</code> |
| <div class="block">Returns whether the given set of columns is a unique key, or a superset |
| of a unique key, of the table.</div> |
| </td> |
| </tr> |
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| <h4>getRowCount</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> getRowCount()</pre> |
| <div class="block">Returns the approximate number of rows in the table.</div> |
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| <h4>isKey</h4> |
| <pre>boolean isKey(<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a> columns)</pre> |
| <div class="block">Returns whether the given set of columns is a unique key, or a superset |
| of a unique key, of the table.</div> |
| </li> |
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| <a name="getKeys--"> |
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| <h4>getKeys</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="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>> getKeys()</pre> |
| <div class="block">Returns a list of unique keys, or null if no key exist.</div> |
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| <h4>getReferentialConstraints</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="../../../../org/apache/calcite/rel/RelReferentialConstraint.html" title="org.apache.calcite.rel中的接口">RelReferentialConstraint</a>> getReferentialConstraints()</pre> |
| <div class="block">Returns the collection of referential constraints (foreign-keys) |
| for this table.</div> |
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| <h4>getCollations</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="../../../../org/apache/calcite/rel/RelCollation.html" title="org.apache.calcite.rel中的接口">RelCollation</a>> getCollations()</pre> |
| <div class="block">Returns the collections of columns on which this table is sorted.</div> |
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| <h4>getDistribution</h4> |
| <pre><a href="../../../../org/apache/calcite/rel/RelDistribution.html" title="org.apache.calcite.rel中的接口">RelDistribution</a> getDistribution()</pre> |
| <div class="block">Returns the distribution of the data in this table.</div> |
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