apidocs/javadocAggregate/org/apache/calcite/adapter/enumerable/EnumerableProject.html - calcite-site - Git at Google

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 <div class="header">
 <div class="subTitle">org.apache.calcite.adapter.enumerable</div>
 <h2 title="类 EnumerableProject" class="title">类 EnumerableProject</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><a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html" title="org.apache.calcite.rel中的类">org.apache.calcite.rel.AbstractRelNode</a></li>
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 <ul class="inheritance">
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 <li><a href="../../../../../org/apache/calcite/rel/core/Project.html" title="org.apache.calcite.rel.core中的类">org.apache.calcite.rel.core.Project</a></li>
 <li>
 <ul class="inheritance">
 <li>org.apache.calcite.adapter.enumerable.EnumerableProject</li>
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 <dl>
 <dt>所有已实现的接口:</dt>
 <dd><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Cloneable.html?is-external=true" title="java.lang中的类或接口">Cloneable</a>, <a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableRel.html" title="org.apache.calcite.adapter.enumerable中的接口">EnumerableRel</a>, <a href="../../../../../org/apache/calcite/plan/RelOptNode.html" title="org.apache.calcite.plan中的接口">RelOptNode</a>, <a href="../../../../../org/apache/calcite/rel/hint/Hintable.html" title="org.apache.calcite.rel.hint中的接口">Hintable</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a></dd>
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 <hr>
 <br>
 <pre>public class <span class="typeNameLabel">EnumerableProject</span>
 extends <a href="../../../../../org/apache/calcite/rel/core/Project.html" title="org.apache.calcite.rel.core中的类">Project</a>
 implements <a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableRel.html" title="org.apache.calcite.adapter.enumerable中的接口">EnumerableRel</a></pre>
 <div class="block">Implementation of <a href="../../../../../org/apache/calcite/rel/core/Project.html" title="org.apache.calcite.rel.core中的类"><code>Project</code></a> in
  <a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableConvention.html" title="org.apache.calcite.adapter.enumerable中的枚举"><code>enumerable calling convention</code></a>.</div>
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 <h3>嵌套类概要</h3>
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 <li class="blockList"><a name="nested.classes.inherited.from.class.org.apache.calcite.rel.core.Project">
 <!--   -->
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 <h3>从类继承的嵌套类/接口&nbsp;org.apache.calcite.rel.core.<a href="../../../../../org/apache/calcite/rel/core/Project.html" title="org.apache.calcite.rel.core中的类">Project</a></h3>
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 <h3>从接口继承的嵌套类/接口&nbsp;org.apache.calcite.adapter.enumerable.<a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableRel.html" title="org.apache.calcite.adapter.enumerable中的接口">EnumerableRel</a></h3>
 <code><a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableRel.Prefer.html" title="org.apache.calcite.adapter.enumerable中的枚举">EnumerableRel.Prefer</a>, <a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableRel.Result.html" title="org.apache.calcite.adapter.enumerable中的类">EnumerableRel.Result</a></code></li>
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 <h3>从类继承的字段&nbsp;org.apache.calcite.rel.core.<a href="../../../../../org/apache/calcite/rel/core/Project.html" title="org.apache.calcite.rel.core中的类">Project</a></h3>
 <code><a href="../../../../../org/apache/calcite/rel/core/Project.html#exps">exps</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#hints">hints</a></code></li>
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 <code><a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#digest">digest</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#id">id</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#rowType">rowType</a>, <a href="../../../../../org/apache/calcite/rel/AbstractRelNode.html#traitSet">traitSet</a></code></li>
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 <h3>构造器概要</h3>
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 <caption><span>构造器</span><span class="tabEnd">&nbsp;</span></caption>
 <tr>
 <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/adapter/enumerable/EnumerableProject.html#EnumerableProject-org.apache.calcite.plan.RelOptCluster-org.apache.calcite.plan.RelTraitSet-org.apache.calcite.rel.RelNode-java.util.List-org.apache.calcite.rel.type.RelDataType-">EnumerableProject</a></span>(<a href="../../../../../org/apache/calcite/plan/RelOptCluster.html" title="org.apache.calcite.plan中的类">RelOptCluster</a>&nbsp;cluster,
                  <a href="../../../../../org/apache/calcite/plan/RelTraitSet.html" title="org.apache.calcite.plan中的类">RelTraitSet</a>&nbsp;traitSet,
                  <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;input,
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                  <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;rowType)</code>
 <div class="block">Creates an EnumerableProject.</div>
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableProject.html#EnumerableProject-org.apache.calcite.plan.RelOptCluster-org.apache.calcite.plan.RelTraitSet-org.apache.calcite.rel.RelNode-java.util.List-org.apache.calcite.rel.type.RelDataType-int-">EnumerableProject</a></span>(<a href="../../../../../org/apache/calcite/plan/RelOptCluster.html" title="org.apache.calcite.plan中的类">RelOptCluster</a>&nbsp;cluster,
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 <div class="block"><span class="deprecatedLabel">已过时。</span>&nbsp;</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">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">静态方法</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">实例方法</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">具体方法</a></span><span class="tabEnd">&nbsp;</span></span></caption>
 <tr>
 <th class="colFirst" scope="col">限定符和类型</th>
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 <tr id="i0" class="altColor">
 <td class="colFirst"><code><a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableProject.html" title="org.apache.calcite.adapter.enumerable中的类">EnumerableProject</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableProject.html#copy-org.apache.calcite.plan.RelTraitSet-org.apache.calcite.rel.RelNode-java.util.List-org.apache.calcite.rel.type.RelDataType-">copy</a></span>(<a href="../../../../../org/apache/calcite/plan/RelTraitSet.html" title="org.apache.calcite.plan中的类">RelTraitSet</a>&nbsp;traitSet,
     <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;input,
     <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>&lt;<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&gt;&nbsp;projects,
     <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;rowType)</code>
 <div class="block">Copies a project.</div>
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 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableProject.html" title="org.apache.calcite.adapter.enumerable中的类">EnumerableProject</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableProject.html#create-org.apache.calcite.rel.RelNode-java.util.List-org.apache.calcite.rel.type.RelDataType-">create</a></span>(<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;input,
       <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>&lt;? extends <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&gt;&nbsp;projects,
       <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;rowType)</code>
 <div class="block">Creates an EnumerableProject, specifying row type rather than field
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 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code><a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableRel.Result.html" title="org.apache.calcite.adapter.enumerable中的类">EnumerableRel.Result</a></code></td>
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 <div class="block">Creates a plan for this expression according to a calling convention.</div>
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 <h3>从类继承的方法&nbsp;org.apache.calcite.rel.core.<a href="../../../../../org/apache/calcite/rel/core/Project.html" title="org.apache.calcite.rel.core中的类">Project</a></h3>
 <code><a href="../../../../../org/apache/calcite/rel/core/Project.html#accept-org.apache.calcite.rex.RexShuttle-">accept</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#computeSelfCost-org.apache.calcite.plan.RelOptPlanner-org.apache.calcite.rel.metadata.RelMetadataQuery-">computeSelfCost</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#copy-org.apache.calcite.plan.RelTraitSet-java.util.List-">copy</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#copy-org.apache.calcite.plan.RelTraitSet-org.apache.calcite.rel.RelNode-java.util.List-org.apache.calcite.rel.type.RelDataType-int-">copy</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#explainTerms-org.apache.calcite.rel.RelWriter-">explainTerms</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#getChildExps--">getChildExps</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#getFlags--">getFlags</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#getHints--">getHints</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#getMapping--">getMapping</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#getMapping-int-java.util.List-">getMapping</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#getNamedProjects--">getNamedProjects</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#getPartialMapping-int-java.util.List-">getPartialMapping</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#getPermutation--">getPermutation</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#getPermutation-int-java.util.List-">getPermutation</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#getProjects--">getProjects</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#isBoxed--">isBoxed</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#isMapping--">isMapping</a>, <a href="../../../../../org/apache/calcite/rel/core/Project.html#isValid-org.apache.calcite.util.Litmus-org.apache.calcite.rel.RelNode.Context-">isValid</a></code></li>
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 <code><a href="../../../../../org/apache/calcite/rel/SingleRel.html#childrenAccept-org.apache.calcite.rel.RelVisitor-">childrenAccept</a>, <a href="../../../../../org/apache/calcite/rel/SingleRel.html#deriveRowType--">deriveRowType</a>, <a href="../../../../../org/apache/calcite/rel/SingleRel.html#estimateRowCount-org.apache.calcite.rel.metadata.RelMetadataQuery-">estimateRowCount</a>, <a href="../../../../../org/apache/calcite/rel/SingleRel.html#getInput--">getInput</a>, <a href="../../../../../org/apache/calcite/rel/SingleRel.html#getInputs--">getInputs</a>, <a href="../../../../../org/apache/calcite/rel/SingleRel.html#replaceInput-int-org.apache.calcite.rel.RelNode-">replaceInput</a></code></li>
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 <code><a href="../../../../../org/apache/calcite/rel/RelNode.html#accept-org.apache.calcite.rel.RelShuttle-">accept</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#accept-org.apache.calcite.rex.RexShuttle-">accept</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#childrenAccept-org.apache.calcite.rel.RelVisitor-">childrenAccept</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#collectVariablesSet-java.util.Set-">collectVariablesSet</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#collectVariablesUsed-java.util.Set-">collectVariablesUsed</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#computeSelfCost-org.apache.calcite.plan.RelOptPlanner-">computeSelfCost</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#computeSelfCost-org.apache.calcite.plan.RelOptPlanner-org.apache.calcite.rel.metadata.RelMetadataQuery-">computeSelfCost</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#copy-org.apache.calcite.plan.RelTraitSet-java.util.List-">copy</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#estimateRowCount-org.apache.calcite.rel.metadata.RelMetadataQuery-">estimateRowCount</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#explain-org.apache.calcite.rel.RelWriter-">explain</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getChildExps--">getChildExps</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getCollationList--">getCollationList</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getConvention--">getConvention</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getCorrelVariable--">getCorrelVariable</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getExpectedInputRowType-int-">getExpectedInputRowType</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getInput-int-">getInput</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getInputs--">getInputs</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getQuery--">getQuery</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getRelTypeName--">getRelTypeName</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getRows--">getRows</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getRowType--">getRowType</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getTable--">getTable</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getVariablesSet--">getVariablesSet</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#getVariablesStopped--">getVariablesStopped</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#isDistinct--">isDistinct</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#isKey-org.apache.calcite.util.ImmutableBitSet-">isKey</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#isValid-boolean-">isValid</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#isValid-org.apache.calcite.util.Litmus-org.apache.calcite.rel.RelNode.Context-">isValid</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#metadata-java.lang.Class-org.apache.calcite.rel.metadata.RelMetadataQuery-">metadata</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#onRegister-org.apache.calcite.plan.RelOptPlanner-">onRegister</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#recomputeDigest--">recomputeDigest</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#register-org.apache.calcite.plan.RelOptPlanner-">register</a>, <a href="../../../../../org/apache/calcite/rel/RelNode.html#replaceInput-int-org.apache.calcite.rel.RelNode-">replaceInput</a></code></li>
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 <h3>构造器详细资料</h3>
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 <pre>public&nbsp;EnumerableProject(<a href="../../../../../org/apache/calcite/plan/RelOptCluster.html" title="org.apache.calcite.plan中的类">RelOptCluster</a>&nbsp;cluster,
                          <a href="../../../../../org/apache/calcite/plan/RelTraitSet.html" title="org.apache.calcite.plan中的类">RelTraitSet</a>&nbsp;traitSet,
                          <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;input,
                          <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>&lt;? extends <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&gt;&nbsp;projects,
                          <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;rowType)</pre>
 <div class="block">Creates an EnumerableProject.

  <p>Use <a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableProject.html#create-org.apache.calcite.rel.RelNode-java.util.List-org.apache.calcite.rel.type.RelDataType-"><code>create(org.apache.calcite.rel.RelNode, java.util.List&lt;? extends org.apache.calcite.rex.RexNode&gt;, org.apache.calcite.rel.type.RelDataType)</code></a> unless you know what you're doing.</div>
 <dl>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>cluster</code> - Cluster this relational expression belongs to</dd>
 <dd><code>traitSet</code> - Traits of this relational expression</dd>
 <dd><code>input</code> - Input relational expression</dd>
 <dd><code>projects</code> - List of expressions for the input columns</dd>
 <dd><code>rowType</code> - Output row type</dd>
 </dl>
 </li>
 </ul>
 <a name="EnumerableProject-org.apache.calcite.plan.RelOptCluster-org.apache.calcite.plan.RelTraitSet-org.apache.calcite.rel.RelNode-java.util.List-org.apache.calcite.rel.type.RelDataType-int-">
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 <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="java.lang中的类或接口">@Deprecated</a>
 public&nbsp;EnumerableProject(<a href="../../../../../org/apache/calcite/plan/RelOptCluster.html" title="org.apache.calcite.plan中的类">RelOptCluster</a>&nbsp;cluster,
                                      <a href="../../../../../org/apache/calcite/plan/RelTraitSet.html" title="org.apache.calcite.plan中的类">RelTraitSet</a>&nbsp;traitSet,
                                      <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;input,
                                      <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>&lt;? extends <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&gt;&nbsp;projects,
                                      <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;rowType,
                                      int&nbsp;flags)</pre>
 <div class="block"><span class="deprecatedLabel">已过时。</span>&nbsp;</div>
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 <h4>create</h4>
 <pre>public static&nbsp;<a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableProject.html" title="org.apache.calcite.adapter.enumerable中的类">EnumerableProject</a>&nbsp;create(<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;input,
                                        <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>&lt;? extends <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&gt;&nbsp;projects,
                                        <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;rowType)</pre>
 <div class="block">Creates an EnumerableProject, specifying row type rather than field
  names.</div>
 </li>
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 <h4>copy</h4>
 <pre>public&nbsp;<a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableProject.html" title="org.apache.calcite.adapter.enumerable中的类">EnumerableProject</a>&nbsp;copy(<a href="../../../../../org/apache/calcite/plan/RelTraitSet.html" title="org.apache.calcite.plan中的类">RelTraitSet</a>&nbsp;traitSet,
                               <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;input,
                               <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>&lt;<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&gt;&nbsp;projects,
                               <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;rowType)</pre>
 <div class="block"><span class="descfrmTypeLabel">从类复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/rel/core/Project.html#copy-org.apache.calcite.plan.RelTraitSet-org.apache.calcite.rel.RelNode-java.util.List-org.apache.calcite.rel.type.RelDataType-">Project</a></code></span></div>
 <div class="block">Copies a project.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">指定者:</span></dt>
 <dd><code><a href="../../../../../org/apache/calcite/rel/core/Project.html#copy-org.apache.calcite.plan.RelTraitSet-org.apache.calcite.rel.RelNode-java.util.List-org.apache.calcite.rel.type.RelDataType-">copy</a></code>&nbsp;在类中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/core/Project.html" title="org.apache.calcite.rel.core中的类">Project</a></code></dd>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>traitSet</code> - Traits</dd>
 <dd><code>input</code> - Input</dd>
 <dd><code>projects</code> - Project expressions</dd>
 <dd><code>rowType</code> - Output row type</dd>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>New <code>Project</code> if any parameter differs from the value of this
    <code>Project</code>, or just <code>this</code> if all the parameters are
    the same</dd>
 <dt><span class="seeLabel">另请参阅:</span></dt>
 <dd><a href="../../../../../org/apache/calcite/rel/core/Project.html#copy-org.apache.calcite.plan.RelTraitSet-java.util.List-"><code>Project.copy(RelTraitSet, List)</code></a></dd>
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 <h4>implement</h4>
 <pre>public&nbsp;<a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableRel.Result.html" title="org.apache.calcite.adapter.enumerable中的类">EnumerableRel.Result</a>&nbsp;implement(<a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableRelImplementor.html" title="org.apache.calcite.adapter.enumerable中的类">EnumerableRelImplementor</a>&nbsp;implementor,
                                       <a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableRel.Prefer.html" title="org.apache.calcite.adapter.enumerable中的枚举">EnumerableRel.Prefer</a>&nbsp;pref)</pre>
 <div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableRel.html#implement-org.apache.calcite.adapter.enumerable.EnumerableRelImplementor-org.apache.calcite.adapter.enumerable.EnumerableRel.Prefer-">EnumerableRel</a></code></span></div>
 <div class="block">Creates a plan for this expression according to a calling convention.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">指定者:</span></dt>
 <dd><code><a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableRel.html#implement-org.apache.calcite.adapter.enumerable.EnumerableRelImplementor-org.apache.calcite.adapter.enumerable.EnumerableRel.Prefer-">implement</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableRel.html" title="org.apache.calcite.adapter.enumerable中的接口">EnumerableRel</a></code></dd>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>implementor</code> - Implementor</dd>
 <dd><code>pref</code> - Preferred representation for rows in result expression</dd>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>Plan for this expression according to a calling convention</dd>
 </dl>
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