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| <h2 title="接口 BuiltInMetadata.Parallelism" class="title">接口 BuiltInMetadata.Parallelism</h2> |
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| <dt>所有超级接口:</dt> |
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| <pre>public static interface <span class="typeNameLabel">BuiltInMetadata.Parallelism</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 degree of parallelism of a relational expression, and |
| how its operators are assigned to processes with independent resource |
| pools.</div> |
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| <th class="colLast" scope="col">接口和说明</th> |
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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.Parallelism.Handler.html" title="org.apache.calcite.rel.metadata中的接口">BuiltInMetadata.Parallelism.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.Parallelism.html" title="org.apache.calcite.rel.metadata中的接口">BuiltInMetadata.Parallelism</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.Parallelism.html#DEF">DEF</a></span></code> </td> |
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| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Boolean.html?is-external=true" title="java.lang中的类或接口">Boolean</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.Parallelism.html#isPhaseTransition--">isPhaseTransition</a></span>()</code> |
| <div class="block">Returns whether each physical operator implementing this relational |
| expression belongs to a different process than its inputs.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="java.lang中的类或接口">Integer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.Parallelism.html#splitCount--">splitCount</a></span>()</code> |
| <div class="block">Returns the number of distinct splits of the data.</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.Parallelism.html" title="org.apache.calcite.rel.metadata中的接口">BuiltInMetadata.Parallelism</a>> DEF</pre> |
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| <div class="block">Returns whether each physical operator implementing this relational |
| expression belongs to a different process than its inputs. |
| |
| <p>A collection of operators processing all of the splits of a particular |
| stage in the query pipeline is called a "phase". A phase starts with |
| a leaf node such as a <a href="../../../../../org/apache/calcite/rel/core/TableScan.html" title="org.apache.calcite.rel.core中的类"><code>TableScan</code></a>, |
| or with a phase-change node such as an |
| <a href="../../../../../org/apache/calcite/rel/core/Exchange.html" title="org.apache.calcite.rel.core中的类"><code>Exchange</code></a>. Hadoop's shuffle operator |
| (a form of sort-exchange) causes data to be sent across the network.</div> |
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| <h4>splitCount</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="java.lang中的类或接口">Integer</a> splitCount()</pre> |
| <div class="block">Returns the number of distinct splits of the data. |
| |
| <p>Note that splits must be distinct. For broadcast, where each copy is |
| the same, returns 1. |
| |
| <p>Thus the split count is the <em>proportion</em> of the data seen by |
| each operator instance.</div> |
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