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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.sql2rel</a></div> |
| <h2 title="Class RelFieldTrimmer.TrimResult" class="title">Class RelFieldTrimmer.TrimResult</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../util/Pair.html" title="class in org.apache.calcite.util">org.apache.calcite.util.Pair</a><<a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>,​<a href="../util/mapping/Mapping.html" title="interface in org.apache.calcite.util.mapping">Mapping</a>></li> |
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| <li>org.apache.calcite.sql2rel.RelFieldTrimmer.TrimResult</li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><code>java.io.Serializable</code>, <code>java.lang.Comparable<<a href="../util/Pair.html" title="class in org.apache.calcite.util">Pair</a><<a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>,​<a href="../util/mapping/Mapping.html" title="interface in org.apache.calcite.util.mapping">Mapping</a>>></code>, <code>java.util.Map.Entry<<a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>,​<a href="../util/mapping/Mapping.html" title="interface in org.apache.calcite.util.mapping">Mapping</a>></code></dd> |
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| <dl> |
| <dt>Enclosing class:</dt> |
| <dd><a href="RelFieldTrimmer.html" title="class in org.apache.calcite.sql2rel">RelFieldTrimmer</a></dd> |
| </dl> |
| <hr> |
| <pre>protected static class <span class="typeNameLabel">RelFieldTrimmer.TrimResult</span> |
| extends <a href="../util/Pair.html" title="class in org.apache.calcite.util">Pair</a><<a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>,​<a href="../util/mapping/Mapping.html" title="interface in org.apache.calcite.util.mapping">Mapping</a>></pre> |
| <div class="block">Result of an attempt to trim columns from a relational expression. |
| |
| <p>The mapping describes where to find the columns wanted by the parent |
| of the current relational expression. |
| |
| <p>The mapping is a |
| <a href="../util/mapping/Mappings.SourceMapping.html" title="interface in org.apache.calcite.util.mapping"><code>Mappings.SourceMapping</code></a>, which means |
| that no column can be used more than once, and some columns are not used. |
| <code>columnsUsed.getSource(i)</code> returns the source of the i'th output |
| field. |
| |
| <p>For example, consider the mapping for a relational expression that |
| has 4 output columns but only two are being used. The mapping |
| {2 → 1, 3 → 0} would give the following behavior: |
| |
| <ul> |
| <li>columnsUsed.getSourceCount() returns 4 |
| <li>columnsUsed.getTargetCount() returns 2 |
| <li>columnsUsed.getSource(0) returns 3 |
| <li>columnsUsed.getSource(1) returns 2 |
| <li>columnsUsed.getSource(2) throws IndexOutOfBounds |
| <li>columnsUsed.getTargetOpt(3) returns 0 |
| <li>columnsUsed.getTargetOpt(0) returns -1 |
| </ul></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../serialized-form.html#org.apache.calcite.sql2rel.RelFieldTrimmer.TrimResult">Serialized Form</a></dd> |
| </dl> |
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| <h3>Fields inherited from class org.apache.calcite.util.<a href="../util/Pair.html" title="class in org.apache.calcite.util">Pair</a></h3> |
| <code><a href="../util/Pair.html#left">left</a>, <a href="../util/Pair.html#right">right</a></code></li> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
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| <th class="colFirst" scope="col">Constructor</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.apache.calcite.rel.RelNode,org.apache.calcite.util.mapping.Mapping)">TrimResult</a></span>​(<a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> left, |
| <a href="../util/mapping/Mapping.html" title="interface in org.apache.calcite.util.mapping">Mapping</a> right)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a TrimResult.</div> |
| </td> |
| </tr> |
| </table> |
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| <h3>Methods inherited from class org.apache.calcite.util.<a href="../util/Pair.html" title="class in org.apache.calcite.util">Pair</a></h3> |
| <code><a href="../util/Pair.html#adjacents(java.lang.Iterable)">adjacents</a>, <a href="../util/Pair.html#compareTo(org.apache.calcite.util.Pair)">compareTo</a>, <a href="../util/Pair.html#equals(java.lang.Object)">equals</a>, <a href="../util/Pair.html#firstAnd(java.lang.Iterable)">firstAnd</a>, <a href="../util/Pair.html#getKey()">getKey</a>, <a href="../util/Pair.html#getValue()">getValue</a>, <a href="../util/Pair.html#hashCode()">hashCode</a>, <a href="../util/Pair.html#left(java.lang.Iterable)">left</a>, <a href="../util/Pair.html#left(java.util.List)">left</a>, <a href="../util/Pair.html#of(java.util.Map.Entry)">of</a>, <a href="../util/Pair.html#of(T1,T2)">of</a>, <a href="../util/Pair.html#right(java.lang.Iterable)">right</a>, <a href="../util/Pair.html#right(java.util.List)">right</a>, <a href="../util/Pair.html#setValue(T2)">setValue</a>, <a href="../util/Pair.html#toMap(java.lang.Iterable)">toMap</a>, <a href="../util/Pair.html#toString()">toString</a>, <a href="../util/Pair.html#zip(java.lang.Iterable,java.lang.Iterable)">zip</a>, <a href="../util/Pair.html#zip(java.util.List,java.util.List)">zip</a>, <a href="../util/Pair.html#zip(java.util.List,java.util.List,boolean)">zip</a>, <a href="../util/Pair.html#zip(K%5B%5D,V%5B%5D)">zip</a>, <a href="../util/Pair.html#zipMutable(java.util.List,java.util.List)">zipMutable</a></code></li> |
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| <code>clone, finalize, getClass, notify, notifyAll, wait, wait, wait</code></li> |
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| <h3>Constructor Detail</h3> |
| <a id="<init>(org.apache.calcite.rel.RelNode,org.apache.calcite.util.mapping.Mapping)"> |
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| <h4>TrimResult</h4> |
| <pre>public TrimResult​(<a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> left, |
| <a href="../util/mapping/Mapping.html" title="interface in org.apache.calcite.util.mapping">Mapping</a> right)</pre> |
| <div class="block">Creates a TrimResult.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>left</code> - New relational expression</dd> |
| <dd><code>right</code> - Mapping of fields onto original fields</dd> |
| </dl> |
| </li> |
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