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| <h2 title="类 RelOptSamplingParameters" class="title">类 RelOptSamplingParameters</h2> |
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| <pre>public class <span class="typeNameLabel">RelOptSamplingParameters</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></pre> |
| <div class="block">RelOptSamplingParameters represents the parameters necessary to produce a |
| sample of a relation. |
| |
| <p>It's parameters are derived from the SQL 2003 TABLESAMPLE clause.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptSamplingParameters.html#RelOptSamplingParameters-boolean-float-boolean-int-">RelOptSamplingParameters</a></span>(boolean isBernoulli, |
| float samplingPercentage, |
| boolean isRepeatable, |
| int repeatableSeed)</code> </td> |
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| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptSamplingParameters.html#getRepeatableSeed--">getRepeatableSeed</a></span>()</code> |
| <div class="block">If <a href="../../../../org/apache/calcite/plan/RelOptSamplingParameters.html#isRepeatable--"><code>isRepeatable()</code></a> returns <code>true</code>, this method returns a |
| user-specified seed value.</div> |
| </td> |
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| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptSamplingParameters.html#getSamplingPercentage--">getSamplingPercentage</a></span>()</code> |
| <div class="block">Returns the sampling percentage.</div> |
| </td> |
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| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptSamplingParameters.html#isBernoulli--">isBernoulli</a></span>()</code> |
| <div class="block">Indicates whether Bernoulli or system sampling should be performed.</div> |
| </td> |
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| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptSamplingParameters.html#isRepeatable--">isRepeatable</a></span>()</code> |
| <div class="block">Indicates whether the sample results should be repeatable.</div> |
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| <h3>构造器详细资料</h3> |
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| <h4>RelOptSamplingParameters</h4> |
| <pre>public RelOptSamplingParameters(boolean isBernoulli, |
| float samplingPercentage, |
| boolean isRepeatable, |
| int repeatableSeed)</pre> |
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| <h4>isBernoulli</h4> |
| <pre>public boolean isBernoulli()</pre> |
| <div class="block">Indicates whether Bernoulli or system sampling should be performed. |
| Bernoulli sampling requires the decision whether to include each row in |
| the the sample to be independent across rows. System sampling allows |
| implementation-dependent behavior.</div> |
| <dl> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>true if Bernoulli sampling is configured, false for system |
| sampling</dd> |
| </dl> |
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| <h4>getSamplingPercentage</h4> |
| <pre>public float getSamplingPercentage()</pre> |
| <div class="block">Returns the sampling percentage. For Bernoulli sampling, the sampling |
| percentage is the likelihood that any given row will be included in the |
| sample. For system sampling, the sampling percentage indicates (roughly) |
| what percentage of the rows will appear in the sample.</div> |
| <dl> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>the sampling percentage between 0.0 and 1.0, exclusive</dd> |
| </dl> |
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| <h4>isRepeatable</h4> |
| <pre>public boolean isRepeatable()</pre> |
| <div class="block">Indicates whether the sample results should be repeatable. Sample results |
| are only required to repeat if no changes have been made to the |
| relation's content or structure. If the sample is configured to be |
| repeatable, then a user-specified seed value can be obtained via |
| <a href="../../../../org/apache/calcite/plan/RelOptSamplingParameters.html#getRepeatableSeed--"><code>getRepeatableSeed()</code></a>.</div> |
| <dl> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>true if the sample results should be repeatable</dd> |
| </dl> |
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| <h4>getRepeatableSeed</h4> |
| <pre>public int getRepeatableSeed()</pre> |
| <div class="block">If <a href="../../../../org/apache/calcite/plan/RelOptSamplingParameters.html#isRepeatable--"><code>isRepeatable()</code></a> returns <code>true</code>, this method returns a |
| user-specified seed value. Samples of the same, unmodified relation |
| should be identical if the sampling mode, sampling percentage and |
| repeatable seed are the same.</div> |
| <dl> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>seed value for repeatable samples</dd> |
| </dl> |
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