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| <div class="subTitle">org.apache.calcite.rel.rules</div> |
| <h2 title="类 CalcRelSplitter" class="title">类 CalcRelSplitter</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><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">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.calcite.rel.rules.CalcRelSplitter</li> |
| </ul> |
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| <div class="description"> |
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| <br> |
| <pre>public abstract class <span class="typeNameLabel">CalcRelSplitter</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">CalcRelSplitter operates on a |
| <a href="../../../../../org/apache/calcite/rel/core/Calc.html" title="org.apache.calcite.rel.core中的类"><code>Calc</code></a> with multiple <a href="../../../../../org/apache/calcite/rex/RexCall.html" title="org.apache.calcite.rex中的类"><code>RexCall</code></a> |
| sub-expressions that cannot all be implemented by a single concrete |
| <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口"><code>RelNode</code></a>. |
| |
| <p>For example, the Java and Fennel calculator do not implement an identical |
| set of operators. The Calc can be used to split a single Calc with |
| mixed Java- and Fennel-only operators into a tree of Calc object that can |
| each be individually implemented by either Java or Fennel.and splits it into |
| several Calc instances. |
| |
| <p>Currently the splitter is only capable of handling two "rel types". That |
| is, it can deal with Java vs. Fennel Calcs, but not Java vs. Fennel vs. |
| some other type of Calc. |
| |
| <p>See <a href="../../../../../org/apache/calcite/rel/rules/ProjectToWindowRule.html" title="org.apache.calcite.rel.rules中的类"><code>ProjectToWindowRule</code></a> |
| for an example of how this class is used.</div> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ======== NESTED CLASS SUMMARY ======== --> |
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| <h3>嵌套类概要</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="嵌套类概要表, 列表嵌套类和解释"> |
| <caption><span>嵌套类</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">限定符和类型</th> |
| <th class="colLast" scope="col">类和说明</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/CalcRelSplitter.RelType.html" title="org.apache.calcite.rel.rules中的类">CalcRelSplitter.RelType</a></span></code> |
| <div class="block">Type of relational expression.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- =========== FIELD SUMMARY =========== --> |
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| <h3>字段概要</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="字段概要表, 列表字段和解释"> |
| <caption><span>字段</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">限定符和类型</th> |
| <th class="colLast" scope="col">字段和说明</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexProgram.html" title="org.apache.calcite.rex中的类">RexProgram</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/CalcRelSplitter.html#program">program</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/tools/RelBuilder.html" title="org.apache.calcite.tools中的类">RelBuilder</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/CalcRelSplitter.html#relBuilder">relBuilder</a></span></code> </td> |
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| <!-- ========== METHOD SUMMARY =========== --> |
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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="t4" class="tableTab"><span><a href="javascript:show(8);">具体方法</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> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>protected boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/CalcRelSplitter.html#canImplement-org.apache.calcite.rel.logical.LogicalCalc-java.lang.String-">canImplement</a></span>(<a href="../../../../../org/apache/calcite/rel/logical/LogicalCalc.html" title="org.apache.calcite.rel.logical中的类">LogicalCalc</a> rel, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> relTypeName)</code> |
| <div class="block">Returns whether a relational expression can be implemented solely in a |
| given <a href="../../../../../org/apache/calcite/rel/rules/CalcRelSplitter.RelType.html" title="org.apache.calcite.rel.rules中的类"><code>CalcRelSplitter.RelType</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>protected <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="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="java.util中的类或接口">Set</a><<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/rules/CalcRelSplitter.html#getCohorts--">getCohorts</a></span>()</code> |
| <div class="block">Returns a list of sets of expressions that should be on the same level.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/CalcRelSplitter.html#handle-org.apache.calcite.rel.RelNode-">handle</a></span>(<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a> rel)</code> |
| <div class="block">Opportunity to further refine the relational expression created for a |
| given level.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>从类继承的方法 java.lang.<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></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="java.lang中的类或接口">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="java.lang中的类或接口">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="java.lang中的类或接口">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="java.lang中的类或接口">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="java.lang中的类或接口">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="java.lang中的类或接口">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="java.lang中的类或接口">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="java.lang中的类或接口">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="java.lang中的类或接口">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="field.detail"> |
| <!-- --> |
| </a> |
| <h3>字段详细资料</h3> |
| <a name="program"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>program</h4> |
| <pre>protected final <a href="../../../../../org/apache/calcite/rex/RexProgram.html" title="org.apache.calcite.rex中的类">RexProgram</a> program</pre> |
| </li> |
| </ul> |
| <a name="relBuilder"> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>relBuilder</h4> |
| <pre>protected final <a href="../../../../../org/apache/calcite/tools/RelBuilder.html" title="org.apache.calcite.tools中的类">RelBuilder</a> relBuilder</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
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| <h3>方法详细资料</h3> |
| <a name="handle-org.apache.calcite.rel.RelNode-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>handle</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a> handle(<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a> rel)</pre> |
| <div class="block">Opportunity to further refine the relational expression created for a |
| given level. The default implementation returns the relational expression |
| unchanged.</div> |
| </li> |
| </ul> |
| <a name="canImplement-org.apache.calcite.rel.logical.LogicalCalc-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>canImplement</h4> |
| <pre>protected boolean canImplement(<a href="../../../../../org/apache/calcite/rel/logical/LogicalCalc.html" title="org.apache.calcite.rel.logical中的类">LogicalCalc</a> rel, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> relTypeName)</pre> |
| <div class="block">Returns whether a relational expression can be implemented solely in a |
| given <a href="../../../../../org/apache/calcite/rel/rules/CalcRelSplitter.RelType.html" title="org.apache.calcite.rel.rules中的类"><code>CalcRelSplitter.RelType</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>rel</code> - Calculation relational expression</dd> |
| <dd><code>relTypeName</code> - Name of a <a href="../../../../../org/apache/calcite/rel/rules/CalcRelSplitter.RelType.html" title="org.apache.calcite.rel.rules中的类"><code>CalcRelSplitter.RelType</code></a></dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Whether relational expression can be implemented</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getCohorts--"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>getCohorts</h4> |
| <pre>protected <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="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="java.util中的类或接口">Set</a><<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>>> getCohorts()</pre> |
| <div class="block">Returns a list of sets of expressions that should be on the same level. |
| |
| <p>For example, if this method returns { {3, 5}, {4, 7} }, it means that |
| expressions 3 and 5, should be on the same level, and expressions 4 and 7 |
| should be on the same level. The two cohorts do not need to be on the |
| same level. |
| |
| <p>The list is best effort. If it is not possible to arrange that the |
| expressions in a cohort are on the same level, the <a href="../../../../../org/apache/calcite/rel/rules/CalcRelSplitter.html#execute--"><code>execute()</code></a> |
| method will still succeed. |
| |
| <p>The default implementation of this method returns the empty list; |
| expressions will be put on the most suitable level. This is generally |
| the lowest possible level, except for literals, which are placed at the |
| level where they are used.</div> |
| <dl> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>List of cohorts, that is sets of expressions, that the splitting |
| algorithm should attempt to place on the same level</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
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