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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rel.convert</a></div> |
| <h1 title="Interface Converter" class="title">Interface Converter</h1> |
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| <div class="contentContainer"> |
| <section class="description"> |
| <dl> |
| <dt>All Superinterfaces:</dt> |
| <dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Cloneable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Cloneable</a></code>, <code><a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code>, <code><a href="../../plan/RelOptNode.html" title="interface in org.apache.calcite.plan">RelOptNode</a></code></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="../../plan/volcano/AbstractConverter.html" title="class in org.apache.calcite.plan.volcano">AbstractConverter</a></code>, <code><a href="../../adapter/cassandra/CassandraToEnumerableConverter.html" title="class in org.apache.calcite.adapter.cassandra">CassandraToEnumerableConverter</a></code>, <code><a href="ConverterImpl.html" title="class in org.apache.calcite.rel.convert">ConverterImpl</a></code>, <code><a href="../../adapter/elasticsearch/ElasticsearchToEnumerableConverter.html" title="class in org.apache.calcite.adapter.elasticsearch">ElasticsearchToEnumerableConverter</a></code>, <code><a href="../../adapter/enumerable/EnumerableBindable.html" title="class in org.apache.calcite.adapter.enumerable">EnumerableBindable</a></code>, <code><a href="../../adapter/enumerable/EnumerableInterpretable.html" title="class in org.apache.calcite.adapter.enumerable">EnumerableInterpretable</a></code>, <code><a href="../../adapter/spark/EnumerableToSparkConverter.html" title="class in org.apache.calcite.adapter.spark">EnumerableToSparkConverter</a></code>, <code><a href="../../adapter/geode/rel/GeodeToEnumerableConverter.html" title="class in org.apache.calcite.adapter.geode.rel">GeodeToEnumerableConverter</a></code>, <code><a href="../../interpreter/InterpretableConverter.html" title="class in org.apache.calcite.interpreter">InterpretableConverter</a></code>, <code><a href="../../adapter/jdbc/JdbcToEnumerableConverter.html" title="class in org.apache.calcite.adapter.jdbc">JdbcToEnumerableConverter</a></code>, <code><a href="../../adapter/spark/JdbcToSparkConverter.html" title="class in org.apache.calcite.adapter.spark">JdbcToSparkConverter</a></code>, <code><a href="../../adapter/mongodb/MongoToEnumerableConverter.html" title="class in org.apache.calcite.adapter.mongodb">MongoToEnumerableConverter</a></code>, <code><a href="NoneConverter.html" title="class in org.apache.calcite.rel.convert">NoneConverter</a></code>, <code><a href="../../adapter/pig/PigToEnumerableConverter.html" title="class in org.apache.calcite.adapter.pig">PigToEnumerableConverter</a></code>, <code><a href="../../adapter/spark/SparkToEnumerableConverter.html" title="class in org.apache.calcite.adapter.spark">SparkToEnumerableConverter</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public interface <span class="typeNameLabel">Converter</span> |
| extends <a href="../RelNode.html" title="interface in org.apache.calcite.rel">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="../../plan/RelTrait.html" title="interface in org.apache.calcite.plan"><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="#getInputTraits()"><code>getInputTraits()</code></a> |
| would return a <a href="../../plan/RelTraitSet.html" title="class in org.apache.calcite.plan"><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> |
| </section> |
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| <h2>Nested Class Summary</h2> |
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| <h2>Nested classes/interfaces inherited from interface org.apache.calcite.rel.<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></h2> |
| <a id="nested.classes.inherited.from.class.org.apache.calcite.rel.RelNode"> |
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| </a><code><a href="../RelNode.Context.html" title="interface in org.apache.calcite.rel">RelNode.Context</a></code></div> |
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| <h2>Method Summary</h2> |
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| <div id="memberSummary_tabpanel" role="tabpanel"> |
| <table aria-labelledby="t0"> |
| <thead> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor" id="i0"> |
| <td class="colFirst"><code><a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getInput()">getInput</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the sole input relational expression.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i1"> |
| <td class="colFirst"><code><a href="../../plan/RelTraitSet.html" title="class in org.apache.calcite.plan">RelTraitSet</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getInputTraits()">getInputTraits</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the trait of the input relational expression.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i2"> |
| <td class="colFirst"><code><a href="../../plan/RelTraitDef.html" title="class in org.apache.calcite.plan">RelTraitDef</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTraitDef()">getTraitDef</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the definition of trait which this converter works on.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="inheritedList"> |
| <h3>Methods inherited from interface org.apache.calcite.rel.<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></h3> |
| <a id="methods.inherited.from.class.org.apache.calcite.rel.RelNode"> |
| <!-- --> |
| </a><code><a href="../RelNode.html#accept(org.apache.calcite.rel.RelShuttle)">accept</a>, <a href="../RelNode.html#accept(org.apache.calcite.rex.RexShuttle)">accept</a>, <a href="../RelNode.html#childrenAccept(org.apache.calcite.rel.RelVisitor)">childrenAccept</a>, <a href="../RelNode.html#collectVariablesSet(java.util.Set)">collectVariablesSet</a>, <a href="../RelNode.html#collectVariablesUsed(java.util.Set)">collectVariablesUsed</a>, <a href="../RelNode.html#computeSelfCost(org.apache.calcite.plan.RelOptPlanner,org.apache.calcite.rel.metadata.RelMetadataQuery)">computeSelfCost</a>, <a href="../RelNode.html#copy(org.apache.calcite.plan.RelTraitSet,java.util.List)">copy</a>, <a href="../RelNode.html#deepEquals(java.lang.Object)">deepEquals</a>, <a href="../RelNode.html#deepHashCode()">deepHashCode</a>, <a href="../RelNode.html#estimateRowCount(org.apache.calcite.rel.metadata.RelMetadataQuery)">estimateRowCount</a>, <a href="../RelNode.html#explain()">explain</a>, <a href="../RelNode.html#explain(org.apache.calcite.rel.RelWriter)">explain</a>, <a href="../RelNode.html#getConvention()">getConvention</a>, <a href="../RelNode.html#getCorrelVariable()">getCorrelVariable</a>, <a href="../RelNode.html#getDigest()">getDigest</a>, <a href="../RelNode.html#getExpectedInputRowType(int)">getExpectedInputRowType</a>, <a href="../RelNode.html#getInput(int)">getInput</a>, <a href="../RelNode.html#getInputs()">getInputs</a>, <a href="../RelNode.html#getRelDigest()">getRelDigest</a>, <a href="../RelNode.html#getRelTypeName()">getRelTypeName</a>, <a href="../RelNode.html#getRowType()">getRowType</a>, <a href="../RelNode.html#getTable()">getTable</a>, <a href="../RelNode.html#getVariablesSet()">getVariablesSet</a>, <a href="../RelNode.html#isEnforcer()">isEnforcer</a>, <a href="../RelNode.html#isValid(org.apache.calcite.util.Litmus,org.apache.calcite.rel.RelNode.Context)">isValid</a>, <a href="../RelNode.html#metadata(java.lang.Class,org.apache.calcite.rel.metadata.RelMetadataQuery)">metadata</a>, <a href="../RelNode.html#onRegister(org.apache.calcite.plan.RelOptPlanner)">onRegister</a>, <a href="../RelNode.html#recomputeDigest()">recomputeDigest</a>, <a href="../RelNode.html#register(org.apache.calcite.plan.RelOptPlanner)">register</a>, <a href="../RelNode.html#replaceInput(int,org.apache.calcite.rel.RelNode)">replaceInput</a></code></div> |
| <div class="inheritedList"> |
| <h3>Methods inherited from interface org.apache.calcite.plan.<a href="../../plan/RelOptNode.html" title="interface in org.apache.calcite.plan">RelOptNode</a></h3> |
| <a id="methods.inherited.from.class.org.apache.calcite.plan.RelOptNode"> |
| <!-- --> |
| </a><code><a href="../../plan/RelOptNode.html#getCluster()">getCluster</a>, <a href="../../plan/RelOptNode.html#getDescription()">getDescription</a>, <a href="../../plan/RelOptNode.html#getId()">getId</a>, <a href="../../plan/RelOptNode.html#getTraitSet()">getTraitSet</a></code></div> |
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| <h3><a id="getInputTraits()">getInputTraits</a></h3> |
| <div class="memberSignature"><span class="returnType"><a href="../../plan/RelTraitSet.html" title="class in org.apache.calcite.plan">RelTraitSet</a></span> <span class="memberName">getInputTraits</span>()</div> |
| <div class="block">Returns the trait of the input relational expression.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>input trait</dd> |
| </dl> |
| </section> |
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| <section class="detail"> |
| <h3><a id="getTraitDef()">getTraitDef</a></h3> |
| <div class="memberSignature"><span class="returnType"><a href="../../plan/RelTraitDef.html" title="class in org.apache.calcite.plan">RelTraitDef</a></span> <span class="memberName">getTraitDef</span>()</div> |
| <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="#getInputTraits()"><code>getInputTraits()</code></a>, and the |
| traits of the output of this converter given by <a href="../../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">Returns:</span></dt> |
| <dd>trait which this converter modifies</dd> |
| </dl> |
| </section> |
| </li> |
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| <h3><a id="getInput()">getInput</a></h3> |
| <div class="memberSignature"><span class="returnType"><a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></span> <span class="memberName">getInput</span>()</div> |
| <div class="block">Returns the sole input relational expression.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>child relational expression</dd> |
| </dl> |
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