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<div class="subTitle">org.apache.calcite.sql2rel</div>
<h2 title="类 RelFieldTrimmer" class="title">类 RelFieldTrimmer</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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<li>org.apache.calcite.sql2rel.RelFieldTrimmer</li>
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<div class="description">
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<dl>
<dt>所有已实现的接口:</dt>
<dd><a href="../../../../org/apache/calcite/util/ReflectiveVisitor.html" title="org.apache.calcite.util中的接口">ReflectiveVisitor</a></dd>
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<pre>public class <span class="typeNameLabel">RelFieldTrimmer</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>
implements <a href="../../../../org/apache/calcite/util/ReflectiveVisitor.html" title="org.apache.calcite.util中的接口">ReflectiveVisitor</a></pre>
<div class="block">Transformer that walks over a tree of relational expressions, replacing each
<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口"><code>RelNode</code></a> with a 'slimmed down' relational expression that projects
only the columns required by its consumer.
<p>Uses multi-methods to fire the right rule for each type of relational
expression. This allows the transformer to be extended without having to
add a new method to RelNode, and without requiring a collection of rule
classes scattered to the four winds.
<p>REVIEW: jhyde, 2009/7/28: Is sql2rel the correct package for this class?
Trimming fields is not an essential part of SQL-to-Rel translation, and
arguably belongs in the optimization phase. But this transformer does not
obey the usual pattern for planner rules; it is difficult to do so, because
each <a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口"><code>RelNode</code></a> needs to return a different set of fields after
trimming.
<p>TODO: Change 2nd arg of the <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(org.apache.calcite.rel.RelNode, org.apache.calcite.util.ImmutableBitSet, java.util.Set&lt;org.apache.calcite.rel.type.RelDataTypeField&gt;)</code></a> method from BitSet to
Mapping. Sometimes it helps the consumer if you return the columns in a
particular order. For instance, it may avoid a project at the top of the
tree just for reordering. Could ease the transition by writing methods that
convert BitSet to Mapping and vice versa.</div>
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<h3>嵌套类概要</h3>
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<caption><span>嵌套类</span><span class="tabEnd">&nbsp;</span></caption>
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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>protected static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></span></code>
<div class="block">Result of an attempt to trim columns from a relational expression.</div>
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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>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#RelFieldTrimmer-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.tools.RelBuilder-">RelFieldTrimmer</a></span>(<a href="../../../../org/apache/calcite/sql/validate/SqlValidator.html" title="org.apache.calcite.sql.validate中的接口">SqlValidator</a>&nbsp;validator,
<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 RelFieldTrimmer.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#RelFieldTrimmer-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.plan.RelOptCluster-org.apache.calcite.rel.core.RelFactories.ProjectFactory-org.apache.calcite.rel.core.RelFactories.FilterFactory-org.apache.calcite.rel.core.RelFactories.JoinFactory-org.apache.calcite.rel.core.RelFactories.SortFactory-org.apache.calcite.rel.core.RelFactories.AggregateFactory-org.apache.calcite.rel.core.RelFactories.SetOpFactory-">RelFieldTrimmer</a></span>(<a href="../../../../org/apache/calcite/sql/validate/SqlValidator.html" title="org.apache.calcite.sql.validate中的接口">SqlValidator</a>&nbsp;validator,
<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/rel/core/RelFactories.ProjectFactory.html" title="org.apache.calcite.rel.core中的接口">RelFactories.ProjectFactory</a>&nbsp;projectFactory,
<a href="../../../../org/apache/calcite/rel/core/RelFactories.FilterFactory.html" title="org.apache.calcite.rel.core中的接口">RelFactories.FilterFactory</a>&nbsp;filterFactory,
<a href="../../../../org/apache/calcite/rel/core/RelFactories.JoinFactory.html" title="org.apache.calcite.rel.core中的接口">RelFactories.JoinFactory</a>&nbsp;joinFactory,
<a href="../../../../org/apache/calcite/rel/core/RelFactories.SortFactory.html" title="org.apache.calcite.rel.core中的接口">RelFactories.SortFactory</a>&nbsp;sortFactory,
<a href="../../../../org/apache/calcite/rel/core/RelFactories.AggregateFactory.html" title="org.apache.calcite.rel.core中的接口">RelFactories.AggregateFactory</a>&nbsp;aggregateFactory,
<a href="../../../../org/apache/calcite/rel/core/RelFactories.SetOpFactory.html" title="org.apache.calcite.rel.core中的接口">RelFactories.SetOpFactory</a>&nbsp;setOpFactory)</code>
<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="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>
<th class="colLast" scope="col">方法和说明</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>protected <a href="../../../../org/apache/calcite/util/mapping/Mapping.html" title="org.apache.calcite.util.mapping中的接口">Mapping</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#createMapping-org.apache.calcite.util.ImmutableBitSet-int-">createMapping</a></span>(<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
int&nbsp;fieldCount)</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#dispatchTrimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">dispatchTrimFields</a></span>(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;rel,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Invokes <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(org.apache.calcite.rel.RelNode, org.apache.calcite.util.ImmutableBitSet, java.util.Set&lt;org.apache.calcite.rel.type.RelDataTypeField&gt;)</code></a>, or the appropriate method for the type
of the rel parameter, using multi-method dispatch.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>protected <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#dummyProject-int-org.apache.calcite.rel.RelNode-">dummyProject</a></span>(int&nbsp;fieldCount,
<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;input)</code>
<div class="block">Creates a project with a dummy column, to protect the parts of the system
that cannot handle a relational expression with no columns.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#result-org.apache.calcite.rel.RelNode-org.apache.calcite.util.mapping.Mapping-">result</a></span>(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;r,
<a href="../../../../org/apache/calcite/util/mapping/Mapping.html" title="org.apache.calcite.util.mapping中的接口">Mapping</a>&nbsp;mapping)</code>&nbsp;</td>
</tr>
<tr id="i4" 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/sql2rel/RelFieldTrimmer.html#trim-org.apache.calcite.rel.RelNode-">trim</a></span>(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;root)</code>
<div class="block">Trims unused fields from a relational expression.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>protected <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimChild-org.apache.calcite.rel.RelNode-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">trimChild</a></span>(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;rel,
<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;input,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Trims the fields of an input relational expression.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>protected <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimChildRestore-org.apache.calcite.rel.RelNode-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">trimChildRestore</a></span>(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;rel,
<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;input,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Trims a child relational expression, then adds back a dummy project to
restore the fields that were removed.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.core.Aggregate-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">trimFields</a></span>(<a href="../../../../org/apache/calcite/rel/core/Aggregate.html" title="org.apache.calcite.rel.core中的类">Aggregate</a>&nbsp;aggregate,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalAggregate.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalAggregate</code></a>.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.core.Filter-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">trimFields</a></span>(<a href="../../../../org/apache/calcite/rel/core/Filter.html" title="org.apache.calcite.rel.core中的类">Filter</a>&nbsp;filter,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalFilter.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalFilter</code></a>.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.core.Join-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">trimFields</a></span>(<a href="../../../../org/apache/calcite/rel/core/Join.html" title="org.apache.calcite.rel.core中的类">Join</a>&nbsp;join,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalJoin.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalJoin</code></a>.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.logical.LogicalTableFunctionScan-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">trimFields</a></span>(<a href="../../../../org/apache/calcite/rel/logical/LogicalTableFunctionScan.html" title="org.apache.calcite.rel.logical中的类">LogicalTableFunctionScan</a>&nbsp;tabFun,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalTableFunctionScan.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalTableFunctionScan</code></a>.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.logical.LogicalTableModify-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">trimFields</a></span>(<a href="../../../../org/apache/calcite/rel/logical/LogicalTableModify.html" title="org.apache.calcite.rel.logical中的类">LogicalTableModify</a>&nbsp;modifier,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalTableModify.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalTableModify</code></a>.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.logical.LogicalValues-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">trimFields</a></span>(<a href="../../../../org/apache/calcite/rel/logical/LogicalValues.html" title="org.apache.calcite.rel.logical中的类">LogicalValues</a>&nbsp;values,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalValues.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalValues</code></a>.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.core.Project-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">trimFields</a></span>(<a href="../../../../org/apache/calcite/rel/core/Project.html" title="org.apache.calcite.rel.core中的类">Project</a>&nbsp;project,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalProject.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalProject</code></a>.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">trimFields</a></span>(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;rel,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Visit method, per <a href="../../../../org/apache/calcite/util/ReflectiveVisitor.html" title="org.apache.calcite.util中的接口"><code>ReflectiveVisitor</code></a>.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.core.SetOp-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">trimFields</a></span>(<a href="../../../../org/apache/calcite/rel/core/SetOp.html" title="org.apache.calcite.rel.core中的类">SetOp</a>&nbsp;setOp,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/core/SetOp.html" title="org.apache.calcite.rel.core中的类"><code>SetOp</code></a> (including UNION and UNION ALL).</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.core.Sort-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">trimFields</a></span>(<a href="../../../../org/apache/calcite/rel/core/Sort.html" title="org.apache.calcite.rel.core中的类">Sort</a>&nbsp;sort,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/core/Sort.html" title="org.apache.calcite.rel.core中的类"><code>Sort</code></a>.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.core.TableScan-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">trimFields</a></span>(<a href="../../../../org/apache/calcite/rel/core/TableScan.html" title="org.apache.calcite.rel.core中的类">TableScan</a>&nbsp;tableAccessRel,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</code>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalTableScan.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalTableScan</code></a>.</div>
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<h3>从类继承的方法&nbsp;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>
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<h3>构造器详细资料</h3>
<a name="RelFieldTrimmer-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.tools.RelBuilder-">
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<h4>RelFieldTrimmer</h4>
<pre>public&nbsp;RelFieldTrimmer(<a href="../../../../org/apache/calcite/sql/validate/SqlValidator.html" title="org.apache.calcite.sql.validate中的接口">SqlValidator</a>&nbsp;validator,
<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 RelFieldTrimmer.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>validator</code> - Validator</dd>
</dl>
</li>
</ul>
<a name="RelFieldTrimmer-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.plan.RelOptCluster-org.apache.calcite.rel.core.RelFactories.ProjectFactory-org.apache.calcite.rel.core.RelFactories.FilterFactory-org.apache.calcite.rel.core.RelFactories.JoinFactory-org.apache.calcite.rel.core.RelFactories.SortFactory-org.apache.calcite.rel.core.RelFactories.AggregateFactory-org.apache.calcite.rel.core.RelFactories.SetOpFactory-">
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<h4>RelFieldTrimmer</h4>
<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;RelFieldTrimmer(<a href="../../../../org/apache/calcite/sql/validate/SqlValidator.html" title="org.apache.calcite.sql.validate中的接口">SqlValidator</a>&nbsp;validator,
<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/rel/core/RelFactories.ProjectFactory.html" title="org.apache.calcite.rel.core中的接口">RelFactories.ProjectFactory</a>&nbsp;projectFactory,
<a href="../../../../org/apache/calcite/rel/core/RelFactories.FilterFactory.html" title="org.apache.calcite.rel.core中的接口">RelFactories.FilterFactory</a>&nbsp;filterFactory,
<a href="../../../../org/apache/calcite/rel/core/RelFactories.JoinFactory.html" title="org.apache.calcite.rel.core中的接口">RelFactories.JoinFactory</a>&nbsp;joinFactory,
<a href="../../../../org/apache/calcite/rel/core/RelFactories.SortFactory.html" title="org.apache.calcite.rel.core中的接口">RelFactories.SortFactory</a>&nbsp;sortFactory,
<a href="../../../../org/apache/calcite/rel/core/RelFactories.AggregateFactory.html" title="org.apache.calcite.rel.core中的接口">RelFactories.AggregateFactory</a>&nbsp;aggregateFactory,
<a href="../../../../org/apache/calcite/rel/core/RelFactories.SetOpFactory.html" title="org.apache.calcite.rel.core中的接口">RelFactories.SetOpFactory</a>&nbsp;setOpFactory)</pre>
<div class="block"><span class="deprecatedLabel">已过时。</span>&nbsp;</div>
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<h3>方法详细资料</h3>
<a name="trim-org.apache.calcite.rel.RelNode-">
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<h4>trim</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;trim(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;root)</pre>
<div class="block">Trims unused fields from a relational expression.
<p>We presume that all fields of the relational expression are wanted by
its consumer, so only trim fields that are not used within the tree.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>root</code> - Root node of relational expression</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>Trimmed relational expression</dd>
</dl>
</li>
</ul>
<a name="trimChild-org.apache.calcite.rel.RelNode-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">
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<h4>trimChild</h4>
<pre>protected&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;trimChild(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;rel,
<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;input,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Trims the fields of an input relational expression.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>rel</code> - Relational expression</dd>
<dd><code>input</code> - Input relational expression, whose fields to trim</dd>
<dd><code>fieldsUsed</code> - Bitmap of fields needed by the consumer</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>New relational expression and its field mapping</dd>
</dl>
</li>
</ul>
<a name="trimChildRestore-org.apache.calcite.rel.RelNode-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">
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<h4>trimChildRestore</h4>
<pre>protected&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;trimChildRestore(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;rel,
<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;input,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Trims a child relational expression, then adds back a dummy project to
restore the fields that were removed.
<p>Sounds pointless? It causes unused fields to be removed
further down the tree (towards the leaves), but it ensure that the
consuming relational expression continues to see the same fields.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>rel</code> - Relational expression</dd>
<dd><code>input</code> - Input relational expression, whose fields to trim</dd>
<dd><code>fieldsUsed</code> - Bitmap of fields needed by the consumer</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>New relational expression and its field mapping</dd>
</dl>
</li>
</ul>
<a name="dispatchTrimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">
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<h4>dispatchTrimFields</h4>
<pre>protected final&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;dispatchTrimFields(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;rel,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Invokes <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(org.apache.calcite.rel.RelNode, org.apache.calcite.util.ImmutableBitSet, java.util.Set&lt;org.apache.calcite.rel.type.RelDataTypeField&gt;)</code></a>, or the appropriate method for the type
of the rel parameter, using multi-method dispatch.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>rel</code> - Relational expression</dd>
<dd><code>fieldsUsed</code> - Bitmap of fields needed by the consumer</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>New relational expression and its field mapping</dd>
</dl>
</li>
</ul>
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<h4>result</h4>
<pre>protected&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;result(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;r,
<a href="../../../../org/apache/calcite/util/mapping/Mapping.html" title="org.apache.calcite.util.mapping中的接口">Mapping</a>&nbsp;mapping)</pre>
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<h4>trimFields</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;trimFields(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;rel,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Visit method, per <a href="../../../../org/apache/calcite/util/ReflectiveVisitor.html" title="org.apache.calcite.util中的接口"><code>ReflectiveVisitor</code></a>.
<p>This method is invoked reflectively, so there may not be any apparent
calls to it. The class (or derived classes) may contain overloads of
this method with more specific types for the <code>rel</code> parameter.
<p>Returns a pair: the relational expression created, and the mapping
between the original fields and the fields of the newly created
relational expression.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>rel</code> - Relational expression</dd>
<dd><code>fieldsUsed</code> - Fields needed by the consumer</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>relational expression and mapping</dd>
</dl>
</li>
</ul>
<a name="trimFields-org.apache.calcite.rel.core.Project-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">
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<h4>trimFields</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;trimFields(<a href="../../../../org/apache/calcite/rel/core/Project.html" title="org.apache.calcite.rel.core中的类">Project</a>&nbsp;project,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalProject.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalProject</code></a>.</div>
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<a name="dummyProject-int-org.apache.calcite.rel.RelNode-">
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<h4>dummyProject</h4>
<pre>protected&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;dummyProject(int&nbsp;fieldCount,
<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;input)</pre>
<div class="block">Creates a project with a dummy column, to protect the parts of the system
that cannot handle a relational expression with no columns.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>fieldCount</code> - Number of fields in the original relational expression</dd>
<dd><code>input</code> - Trimmed input</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>Dummy project, or null if no dummy is required</dd>
</dl>
</li>
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<h4>trimFields</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;trimFields(<a href="../../../../org/apache/calcite/rel/core/Filter.html" title="org.apache.calcite.rel.core中的类">Filter</a>&nbsp;filter,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalFilter.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalFilter</code></a>.</div>
</li>
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<h4>trimFields</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;trimFields(<a href="../../../../org/apache/calcite/rel/core/Sort.html" title="org.apache.calcite.rel.core中的类">Sort</a>&nbsp;sort,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/core/Sort.html" title="org.apache.calcite.rel.core中的类"><code>Sort</code></a>.</div>
</li>
</ul>
<a name="trimFields-org.apache.calcite.rel.core.Join-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">
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<h4>trimFields</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;trimFields(<a href="../../../../org/apache/calcite/rel/core/Join.html" title="org.apache.calcite.rel.core中的类">Join</a>&nbsp;join,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalJoin.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalJoin</code></a>.</div>
</li>
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<a name="trimFields-org.apache.calcite.rel.core.SetOp-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">
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<h4>trimFields</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;trimFields(<a href="../../../../org/apache/calcite/rel/core/SetOp.html" title="org.apache.calcite.rel.core中的类">SetOp</a>&nbsp;setOp,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/core/SetOp.html" title="org.apache.calcite.rel.core中的类"><code>SetOp</code></a> (including UNION and UNION ALL).</div>
</li>
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<a name="trimFields-org.apache.calcite.rel.core.Aggregate-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">
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<h4>trimFields</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;trimFields(<a href="../../../../org/apache/calcite/rel/core/Aggregate.html" title="org.apache.calcite.rel.core中的类">Aggregate</a>&nbsp;aggregate,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalAggregate.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalAggregate</code></a>.</div>
</li>
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<a name="trimFields-org.apache.calcite.rel.logical.LogicalTableModify-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">
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<h4>trimFields</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;trimFields(<a href="../../../../org/apache/calcite/rel/logical/LogicalTableModify.html" title="org.apache.calcite.rel.logical中的类">LogicalTableModify</a>&nbsp;modifier,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalTableModify.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalTableModify</code></a>.</div>
</li>
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<a name="trimFields-org.apache.calcite.rel.logical.LogicalTableFunctionScan-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">
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<h4>trimFields</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;trimFields(<a href="../../../../org/apache/calcite/rel/logical/LogicalTableFunctionScan.html" title="org.apache.calcite.rel.logical中的类">LogicalTableFunctionScan</a>&nbsp;tabFun,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalTableFunctionScan.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalTableFunctionScan</code></a>.</div>
</li>
</ul>
<a name="trimFields-org.apache.calcite.rel.logical.LogicalValues-org.apache.calcite.util.ImmutableBitSet-java.util.Set-">
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<h4>trimFields</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;trimFields(<a href="../../../../org/apache/calcite/rel/logical/LogicalValues.html" title="org.apache.calcite.rel.logical中的类">LogicalValues</a>&nbsp;values,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalValues.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalValues</code></a>.</div>
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<ul class="blockList">
<li class="blockList">
<h4>createMapping</h4>
<pre>protected&nbsp;<a href="../../../../org/apache/calcite/util/mapping/Mapping.html" title="org.apache.calcite.util.mapping中的接口">Mapping</a>&nbsp;createMapping(<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
int&nbsp;fieldCount)</pre>
</li>
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<h4>trimFields</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.TrimResult.html" title="org.apache.calcite.sql2rel中的类">RelFieldTrimmer.TrimResult</a>&nbsp;trimFields(<a href="../../../../org/apache/calcite/rel/core/TableScan.html" title="org.apache.calcite.rel.core中的类">TableScan</a>&nbsp;tableAccessRel,
<a href="../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;fieldsUsed,
<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>&lt;<a href="../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;extraFields)</pre>
<div class="block">Variant of <a href="../../../../org/apache/calcite/sql2rel/RelFieldTrimmer.html#trimFields-org.apache.calcite.rel.RelNode-org.apache.calcite.util.ImmutableBitSet-java.util.Set-"><code>trimFields(RelNode, ImmutableBitSet, Set)</code></a> for
<a href="../../../../org/apache/calcite/rel/logical/LogicalTableScan.html" title="org.apache.calcite.rel.logical中的类"><code>LogicalTableScan</code></a>.</div>
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