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 <div class="subTitle">org.apache.calcite.rel.rules</div>
 <h2 title="类 PushProjector" class="title">类 PushProjector</h2>
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 <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>
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 <pre>public class <span class="typeNameLabel">PushProjector</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">PushProjector is a utility class used to perform operations used in push
  projection rules.

  <p>Pushing is particularly interesting in the case of join, because there
  are multiple inputs. Generally an expression can be pushed down to a
  particular input if it depends upon no other inputs. If it can be pushed
  down to both sides, it is pushed down to the left.

  <p>Sometimes an expression needs to be split before it can be pushed down.
  To flag that an expression cannot be split, specify a rule that it must be
  <dfn>preserved</dfn>. Such an expression will be pushed down intact to one
  of the inputs, or not pushed down at all.</p></div>
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 <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 interface&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PushProjector.ExprCondition.html" title="org.apache.calcite.rel.rules中的接口">PushProjector.ExprCondition</a></span></code>
 <div class="block">A functor that replies true or false for a given expression.</div>
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 <th class="colOne" scope="col">构造器和说明</th>
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PushProjector.html#PushProjector-org.apache.calcite.rel.core.Project-org.apache.calcite.rex.RexNode-org.apache.calcite.rel.RelNode-org.apache.calcite.rel.rules.PushProjector.ExprCondition-org.apache.calcite.tools.RelBuilder-">PushProjector</a></span>(<a href="../../../../../org/apache/calcite/rel/core/Project.html" title="org.apache.calcite.rel.core中的类">Project</a>&nbsp;origProj,
              <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&nbsp;origFilter,
              <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;childRel,
              <a href="../../../../../org/apache/calcite/rel/rules/PushProjector.ExprCondition.html" title="org.apache.calcite.rel.rules中的接口">PushProjector.ExprCondition</a>&nbsp;preserveExprCondition,
              <a href="../../../../../org/apache/calcite/tools/RelBuilder.html" title="org.apache.calcite.tools中的类">RelBuilder</a>&nbsp;relBuilder)</code>
 <div class="block">Creates a PushProjector object for pushing projects past a RelNode.</div>
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 <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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 <td class="colFirst"><code><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/PushProjector.html#convertProject-org.apache.calcite.rex.RexNode-">convertProject</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&nbsp;defaultExpr)</code>
 <div class="block">Decomposes a projection to the input references referenced by a
  projection and a filter, either of which is optional.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code><a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PushProjector.html#convertRefsAndExprs-org.apache.calcite.rex.RexNode-java.util.List-int:A-">convertRefsAndExprs</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&nbsp;rex,
                    <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/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;destFields,
                    int[]&nbsp;adjustments)</code>
 <div class="block">Clones an expression tree and walks through it, adjusting each
  RexInputRef index by some amount, and converting expressions that need to
  be preserved to field references.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code><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/PushProjector.html#createNewProject-org.apache.calcite.rel.RelNode-int:A-">createNewProject</a></span>(<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;projChild,
                 int[]&nbsp;adjustments)</code>
 <div class="block">Creates a new projection based on the original projection, adjusting all
  input refs using an adjustment array passed in.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code><a href="../../../../../org/apache/calcite/rel/core/Project.html" title="org.apache.calcite.rel.core中的类">Project</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PushProjector.html#createProjectRefsAndExprs-org.apache.calcite.rel.RelNode-boolean-boolean-">createProjectRefsAndExprs</a></span>(<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;projChild,
                          boolean&nbsp;adjust,
                          boolean&nbsp;rightSide)</code>
 <div class="block">Creates a projection based on the inputs specified in a bitmap and the
  expressions that need to be preserved.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>int[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/PushProjector.html#getAdjustments--">getAdjustments</a></span>()</code>
 <div class="block">Determines how much each input reference needs to be adjusted as a result
  of projection</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/rel/rules/PushProjector.html#locateAllRefs--">locateAllRefs</a></span>()</code>
 <div class="block">Locates all references found in either the projection expressions a
  filter, as well as references to expressions that should be preserved.</div>
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 <h3>构造器详细资料</h3>
 <a name="PushProjector-org.apache.calcite.rel.core.Project-org.apache.calcite.rex.RexNode-org.apache.calcite.rel.RelNode-org.apache.calcite.rel.rules.PushProjector.ExprCondition-org.apache.calcite.tools.RelBuilder-">
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 <h4>PushProjector</h4>
 <pre>public&nbsp;PushProjector(<a href="../../../../../org/apache/calcite/rel/core/Project.html" title="org.apache.calcite.rel.core中的类">Project</a>&nbsp;origProj,
                      <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&nbsp;origFilter,
                      <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;childRel,
                      <a href="../../../../../org/apache/calcite/rel/rules/PushProjector.ExprCondition.html" title="org.apache.calcite.rel.rules中的接口">PushProjector.ExprCondition</a>&nbsp;preserveExprCondition,
                      <a href="../../../../../org/apache/calcite/tools/RelBuilder.html" title="org.apache.calcite.tools中的类">RelBuilder</a>&nbsp;relBuilder)</pre>
 <div class="block">Creates a PushProjector object for pushing projects past a RelNode.</div>
 <dl>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>origProj</code> - the original projection that is being pushed;
                               may be null if the projection is implied as a
                               result of a projection having been trivially
                               removed</dd>
 <dd><code>origFilter</code> - the filter that the projection must also be
                               pushed past, if applicable</dd>
 <dd><code>childRel</code> - the RelNode that the projection is being
                               pushed past</dd>
 <dd><code>preserveExprCondition</code> - condition for whether an expression should
                               be preserved in the projection</dd>
 </dl>
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 <a name="convertProject-org.apache.calcite.rex.RexNode-">
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 <h4>convertProject</h4>
 <pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;convertProject(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&nbsp;defaultExpr)</pre>
 <div class="block">Decomposes a projection to the input references referenced by a
  projection and a filter, either of which is optional. If both are
  provided, the filter is underneath the project.

  <p>Creates a projection containing all input references as well as
  preserving any special expressions. Converts the original projection
  and/or filter to reference the new projection. Then, finally puts on top,
  a final projection corresponding to the original projection.</div>
 <dl>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>defaultExpr</code> - expression to be used in the projection if no fields
                     or special columns are selected</dd>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>the converted projection if it makes sense to push elements of
  the projection; otherwise returns null</dd>
 </dl>
 </li>
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 <h4>locateAllRefs</h4>
 <pre>public&nbsp;boolean&nbsp;locateAllRefs()</pre>
 <div class="block">Locates all references found in either the projection expressions a
  filter, as well as references to expressions that should be preserved.
  Based on that, determines whether pushing the projection makes sense.</div>
 <dl>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>true if all inputs from the child that the projection is being
  pushed past are referenced in the projection/filter and no special
  preserve expressions are referenced; in that case, it does not make sense
  to push the projection</dd>
 </dl>
 </li>
 </ul>
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 <h4>createProjectRefsAndExprs</h4>
 <pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/core/Project.html" title="org.apache.calcite.rel.core中的类">Project</a>&nbsp;createProjectRefsAndExprs(<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;projChild,
                                          boolean&nbsp;adjust,
                                          boolean&nbsp;rightSide)</pre>
 <div class="block">Creates a projection based on the inputs specified in a bitmap and the
  expressions that need to be preserved. The expressions are appended after
  the input references.</div>
 <dl>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>projChild</code> - child that the projection will be created on top of</dd>
 <dd><code>adjust</code> - if true, need to create new projection expressions;
                   otherwise, the existing ones are reused</dd>
 <dd><code>rightSide</code> - if true, creating a projection for the right hand side
                   of a join</dd>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>created projection</dd>
 </dl>
 </li>
 </ul>
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 <h4>getAdjustments</h4>
 <pre>public&nbsp;int[]&nbsp;getAdjustments()</pre>
 <div class="block">Determines how much each input reference needs to be adjusted as a result
  of projection</div>
 <dl>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>array indicating how much each input needs to be adjusted by</dd>
 </dl>
 </li>
 </ul>
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 <h4>convertRefsAndExprs</h4>
 <pre>public&nbsp;<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&nbsp;convertRefsAndExprs(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&nbsp;rex,
                                    <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/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;destFields,
                                    int[]&nbsp;adjustments)</pre>
 <div class="block">Clones an expression tree and walks through it, adjusting each
  RexInputRef index by some amount, and converting expressions that need to
  be preserved to field references.</div>
 <dl>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>rex</code> - the expression</dd>
 <dd><code>destFields</code> - fields that the new expressions will be referencing</dd>
 <dd><code>adjustments</code> - the amount each input reference index needs to be
                     adjusted by</dd>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>modified expression tree</dd>
 </dl>
 </li>
 </ul>
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 <h4>createNewProject</h4>
 <pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;createNewProject(<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;projChild,
                                 int[]&nbsp;adjustments)</pre>
 <div class="block">Creates a new projection based on the original projection, adjusting all
  input refs using an adjustment array passed in. If there was no original
  projection, create a new one that selects every field from the underlying
  rel.

  <p>If the resulting projection would be trivial, return the child.</div>
 <dl>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>projChild</code> - child of the new project</dd>
 <dd><code>adjustments</code> - array indicating how much each input reference should
                     be adjusted by</dd>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>the created projection</dd>
 </dl>
 </li>
 </ul>
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