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<div class="subTitle">org.apache.calcite.rel.convert</div>
<h2 title="接口 Converter" class="title">接口 Converter</h2>
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<dt>所有超级接口:</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/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>, <a href="../../../../../org/apache/calcite/plan/RelOptNode.html" title="org.apache.calcite.plan中的接口">RelOptNode</a></dd>
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<dl>
<dt>所有已知实现类:</dt>
<dd><a href="../../../../../org/apache/calcite/plan/volcano/AbstractConverter.html" title="org.apache.calcite.plan.volcano中的类">AbstractConverter</a>, <a href="../../../../../org/apache/calcite/adapter/cassandra/CassandraToEnumerableConverter.html" title="org.apache.calcite.adapter.cassandra中的类">CassandraToEnumerableConverter</a>, <a href="../../../../../org/apache/calcite/rel/convert/ConverterImpl.html" title="org.apache.calcite.rel.convert中的类">ConverterImpl</a>, <a href="../../../../../org/apache/calcite/adapter/elasticsearch/ElasticsearchToEnumerableConverter.html" title="org.apache.calcite.adapter.elasticsearch中的类">ElasticsearchToEnumerableConverter</a>, <a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableBindable.html" title="org.apache.calcite.adapter.enumerable中的类">EnumerableBindable</a>, <a href="../../../../../org/apache/calcite/adapter/enumerable/EnumerableInterpretable.html" title="org.apache.calcite.adapter.enumerable中的类">EnumerableInterpretable</a>, <a href="../../../../../org/apache/calcite/adapter/spark/EnumerableToSparkConverter.html" title="org.apache.calcite.adapter.spark中的类">EnumerableToSparkConverter</a>, <a href="../../../../../org/apache/calcite/adapter/geode/rel/GeodeToEnumerableConverter.html" title="org.apache.calcite.adapter.geode.rel中的类">GeodeToEnumerableConverter</a>, <a href="../../../../../org/apache/calcite/interpreter/InterpretableConverter.html" title="org.apache.calcite.interpreter中的类">InterpretableConverter</a>, <a href="../../../../../org/apache/calcite/adapter/jdbc/JdbcToEnumerableConverter.html" title="org.apache.calcite.adapter.jdbc中的类">JdbcToEnumerableConverter</a>, <a href="../../../../../org/apache/calcite/adapter/spark/JdbcToSparkConverter.html" title="org.apache.calcite.adapter.spark中的类">JdbcToSparkConverter</a>, <a href="../../../../../org/apache/calcite/adapter/mongodb/MongoToEnumerableConverter.html" title="org.apache.calcite.adapter.mongodb中的类">MongoToEnumerableConverter</a>, <a href="../../../../../org/apache/calcite/rel/convert/NoneConverter.html" title="org.apache.calcite.rel.convert中的类">NoneConverter</a>, <a href="../../../../../org/apache/calcite/adapter/pig/PigToEnumerableConverter.html" title="org.apache.calcite.adapter.pig中的类">PigToEnumerableConverter</a>, <a href="../../../../../org/apache/calcite/adapter/spark/SparkToEnumerableConverter.html" title="org.apache.calcite.adapter.spark中的类">SparkToEnumerableConverter</a></dd>
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<pre>public interface <span class="typeNameLabel">Converter</span>
extends <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a></pre>
<div class="block">A relational expression implements the interface <code>Converter</code> to
indicate that it converts a physical attribute, or
<a href="../../../../../org/apache/calcite/plan/RelTrait.html" title="org.apache.calcite.plan中的接口"><code>trait</code></a>, of a relational expression
from one value to another.
<p>Sometimes this conversion is expensive; for example, to convert a
non-distinct to a distinct object stream, we have to clone every object in
the input.</p>
<p>A converter does not change the logical expression being evaluated; after
conversion, the number of rows and the values of those rows will still be the
same. By declaring itself to be a converter, a relational expression is
telling the planner about this equivalence, and the planner groups
expressions which are logically equivalent but have different physical traits
into groups called <code>RelSet</code>s.
<p>In principle one could devise converters which change multiple traits
simultaneously (say change the sort-order and the physical location of a
relational expression). In which case, the method <a href="../../../../../org/apache/calcite/rel/convert/Converter.html#getInputTraits--"><code>getInputTraits()</code></a>
would return a <a href="../../../../../org/apache/calcite/plan/RelTraitSet.html" title="org.apache.calcite.plan中的类"><code>RelTraitSet</code></a>. But for
simplicity, this class only allows one trait to be converted at a
time; all other traits are assumed to be preserved.</p></div>
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<h3>从接口继承的嵌套类/接口&nbsp;org.apache.calcite.rel.<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a></h3>
<code><a href="../../../../../org/apache/calcite/rel/RelNode.Context.html" title="org.apache.calcite.rel中的接口">RelNode.Context</a></code></li>
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<h3>方法概要</h3>
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<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="t3" class="tableTab"><span><a href="javascript:show(4);">抽象方法</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>
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<tr id="i0" 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/convert/Converter.html#getInput--">getInput</a></span>()</code>
<div class="block">Returns the sole input relational expression</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/plan/RelTraitSet.html" title="org.apache.calcite.plan中的类">RelTraitSet</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/convert/Converter.html#getInputTraits--">getInputTraits</a></span>()</code>
<div class="block">Returns the trait of the input relational expression.</div>
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<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/plan/RelTraitDef.html" title="org.apache.calcite.plan中的类">RelTraitDef</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/convert/Converter.html#getTraitDef--">getTraitDef</a></span>()</code>
<div class="block">Returns the definition of trait which this converter works on.</div>
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<h3>从接口继承的方法&nbsp;org.apache.calcite.rel.<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a></h3>
<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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<code><a href="../../../../../org/apache/calcite/plan/RelOptNode.html#getCluster--">getCluster</a>, <a href="../../../../../org/apache/calcite/plan/RelOptNode.html#getDescription--">getDescription</a>, <a href="../../../../../org/apache/calcite/plan/RelOptNode.html#getDigest--">getDigest</a>, <a href="../../../../../org/apache/calcite/plan/RelOptNode.html#getId--">getId</a>, <a href="../../../../../org/apache/calcite/plan/RelOptNode.html#getTraitSet--">getTraitSet</a></code></li>
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<h4>getInputTraits</h4>
<pre><a href="../../../../../org/apache/calcite/plan/RelTraitSet.html" title="org.apache.calcite.plan中的类">RelTraitSet</a>&nbsp;getInputTraits()</pre>
<div class="block">Returns the trait of the input relational expression.</div>
<dl>
<dt><span class="returnLabel">返回:</span></dt>
<dd>input trait</dd>
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<h4>getTraitDef</h4>
<pre><a href="../../../../../org/apache/calcite/plan/RelTraitDef.html" title="org.apache.calcite.plan中的类">RelTraitDef</a>&nbsp;getTraitDef()</pre>
<div class="block">Returns the definition of trait which this converter works on.
<p>The input relational expression (matched by the rule) must possess
this trait and have the value given by <a href="../../../../../org/apache/calcite/rel/convert/Converter.html#getInputTraits--"><code>getInputTraits()</code></a>, and the
traits of the output of this converter given by <a href="../../../../../org/apache/calcite/plan/RelOptNode.html#getTraitSet--"><code>RelOptNode.getTraitSet()</code></a> will
have one trait altered and the other orthogonal traits will be the same.</div>
<dl>
<dt><span class="returnLabel">返回:</span></dt>
<dd>trait which this converter modifies</dd>
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<h4>getInput</h4>
<pre><a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&nbsp;getInput()</pre>
<div class="block">Returns the sole input relational expression</div>
<dl>
<dt><span class="returnLabel">返回:</span></dt>
<dd>child relational expression</dd>
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