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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.plan</a></div>
<h2 title="Interface RelOptTable" class="title">Interface RelOptTable</h2>
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<dt>All Superinterfaces:</dt>
<dd><code><a href="../schema/Wrapper.html" title="interface in org.apache.calcite.schema">Wrapper</a></code></dd>
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<dl>
<dt>All Known Subinterfaces:</dt>
<dd><code><a href="../prepare/Prepare.PreparingTable.html" title="interface in org.apache.calcite.prepare">Prepare.PreparingTable</a></code></dd>
</dl>
<dl>
<dt>All Known Implementing Classes:</dt>
<dd><code><a href="../rel/rules/LoptSemiJoinOptimizer.LcsTable.html" title="class in org.apache.calcite.rel.rules">LoptSemiJoinOptimizer.LcsTable</a></code>, <code><a href="../prepare/Prepare.AbstractPreparingTable.html" title="class in org.apache.calcite.prepare">Prepare.AbstractPreparingTable</a></code>, <code><a href="RelOptAbstractTable.html" title="class in org.apache.calcite.plan">RelOptAbstractTable</a></code>, <code><a href="../prepare/RelOptTableImpl.html" title="class in org.apache.calcite.prepare">RelOptTableImpl</a></code></dd>
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<pre>public interface <span class="typeNameLabel">RelOptTable</span>
extends <a href="../schema/Wrapper.html" title="interface in org.apache.calcite.schema">Wrapper</a></pre>
<div class="block">Represents a relational dataset in a <a href="RelOptSchema.html" title="interface in org.apache.calcite.plan"><code>RelOptSchema</code></a>. It has methods to
describe and implement itself.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Interface</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static interface&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RelOptTable.ToRelContext.html" title="interface in org.apache.calcite.plan">RelOptTable.ToRelContext</a></span></code></th>
<td class="colLast">
<div class="block">Contains the context needed to convert a a table into a relational
expression.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static interface&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RelOptTable.ViewExpander.html" title="interface in org.apache.calcite.plan">RelOptTable.ViewExpander</a></span></code></th>
<td class="colLast">
<div class="block">Can expand a view into relational expressions.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><code><a href="RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#extend(java.util.List)">extend</a></span>&#8203;(java.util.List&lt;<a href="../rel/type/RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&gt;&nbsp;extendedFields)</code></th>
<td class="colLast">
<div class="block">Returns a table with the given extra fields.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>java.util.List&lt;<a href="../rel/RelCollation.html" title="interface in org.apache.calcite.rel">RelCollation</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCollationList()">getCollationList</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns a description of the physical ordering (or orderings) of the rows
returned from this table.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>java.util.List&lt;<a href="../schema/ColumnStrategy.html" title="enum in org.apache.calcite.schema">ColumnStrategy</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getColumnStrategies()">getColumnStrategies</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns a list describing how each column is populated.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../rel/RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getDistribution()">getDistribution</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns a description of the physical distribution of the rows
in this table.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../linq4j/tree/Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getExpression(java.lang.Class)">getExpression</a></span>&#8203;(java.lang.Class&nbsp;clazz)</code></th>
<td class="colLast">
<div class="block">Generates code for this table.</div>
</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>java.util.List&lt;java.lang.String&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getQualifiedName()">getQualifiedName</a></span>()</code></th>
<td class="colLast">
<div class="block">Obtains an identifier for this table.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>java.util.List&lt;<a href="../rel/RelReferentialConstraint.html" title="interface in org.apache.calcite.rel">RelReferentialConstraint</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getReferentialConstraints()">getReferentialConstraints</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the referential constraints existing for this table.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="RelOptSchema.html" title="interface in org.apache.calcite.plan">RelOptSchema</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getRelOptSchema()">getRelOptSchema</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the <a href="RelOptSchema.html" title="interface in org.apache.calcite.plan"><code>RelOptSchema</code></a> this table belongs to.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getRowCount()">getRowCount</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns an estimate of the number of rows in the table.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getRowType()">getRowType</a></span>()</code></th>
<td class="colLast">
<div class="block">Describes the type of rows returned by this table.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isKey(org.apache.calcite.util.ImmutableBitSet)">isKey</a></span>&#8203;(<a href="../util/ImmutableBitSet.html" title="class in org.apache.calcite.util">ImmutableBitSet</a>&nbsp;columns)</code></th>
<td class="colLast">
<div class="block">Returns whether the given columns are a key or a superset of a unique key
of this table.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toRel(org.apache.calcite.plan.RelOptTable.ToRelContext)">toRel</a></span>&#8203;(<a href="RelOptTable.ToRelContext.html" title="interface in org.apache.calcite.plan">RelOptTable.ToRelContext</a>&nbsp;context)</code></th>
<td class="colLast">
<div class="block">Converts this table into a <a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel"><code>relational expression</code></a>.</div>
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<h3>Methods inherited from interface&nbsp;org.apache.calcite.schema.<a href="../schema/Wrapper.html" title="interface in org.apache.calcite.schema">Wrapper</a></h3>
<code><a href="../schema/Wrapper.html#unwrap(java.lang.Class)">unwrap</a></code></li>
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<h4>getQualifiedName</h4>
<pre class="methodSignature">java.util.List&lt;java.lang.String&gt;&nbsp;getQualifiedName()</pre>
<div class="block">Obtains an identifier for this table. The identifier must be unique with
respect to the Connection producing this table.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>qualified name</dd>
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<h4>getRowCount</h4>
<pre class="methodSignature">double&nbsp;getRowCount()</pre>
<div class="block">Returns an estimate of the number of rows in the table.</div>
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<h4>getRowType</h4>
<pre class="methodSignature"><a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;getRowType()</pre>
<div class="block">Describes the type of rows returned by this table.</div>
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<h4>getRelOptSchema</h4>
<pre class="methodSignature"><a href="RelOptSchema.html" title="interface in org.apache.calcite.plan">RelOptSchema</a>&nbsp;getRelOptSchema()</pre>
<div class="block">Returns the <a href="RelOptSchema.html" title="interface in org.apache.calcite.plan"><code>RelOptSchema</code></a> this table belongs to.</div>
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<a id="toRel(org.apache.calcite.plan.RelOptTable.ToRelContext)">
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<h4>toRel</h4>
<pre class="methodSignature"><a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;toRel&#8203;(<a href="RelOptTable.ToRelContext.html" title="interface in org.apache.calcite.plan">RelOptTable.ToRelContext</a>&nbsp;context)</pre>
<div class="block">Converts this table into a <a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel"><code>relational expression</code></a>.
<p>The <a href="RelOptPlanner.html" title="interface in org.apache.calcite.plan"><code>planner</code></a> calls this
method to convert a table into an initial relational expression,
generally something abstract, such as a
<a href="../rel/logical/LogicalTableScan.html" title="class in org.apache.calcite.rel.logical"><code>LogicalTableScan</code></a>,
then optimizes this expression by
applying <a href="RelOptRule.html" title="class in org.apache.calcite.plan"><code>rules</code></a> to transform it
into more efficient access methods for this table.</p></div>
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<h4>getCollationList</h4>
<pre class="methodSignature">java.util.List&lt;<a href="../rel/RelCollation.html" title="interface in org.apache.calcite.rel">RelCollation</a>&gt;&nbsp;getCollationList()</pre>
<div class="block">Returns a description of the physical ordering (or orderings) of the rows
returned from this table.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../rel/metadata/RelMetadataQuery.html#collations(org.apache.calcite.rel.RelNode)"><code>RelMetadataQuery.collations(RelNode)</code></a></dd>
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<h4>getDistribution</h4>
<pre class="methodSignature"><a href="../rel/RelDistribution.html" title="interface in org.apache.calcite.rel">RelDistribution</a>&nbsp;getDistribution()</pre>
<div class="block">Returns a description of the physical distribution of the rows
in this table.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../rel/metadata/RelMetadataQuery.html#distribution(org.apache.calcite.rel.RelNode)"><code>RelMetadataQuery.distribution(RelNode)</code></a></dd>
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<h4>isKey</h4>
<pre class="methodSignature">boolean&nbsp;isKey&#8203;(<a href="../util/ImmutableBitSet.html" title="class in org.apache.calcite.util">ImmutableBitSet</a>&nbsp;columns)</pre>
<div class="block">Returns whether the given columns are a key or a superset of a unique key
of this table.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>columns</code> - Ordinals of key columns</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Whether the given columns are a key or a superset of a key</dd>
</dl>
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<a id="getReferentialConstraints()">
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<h4>getReferentialConstraints</h4>
<pre class="methodSignature">java.util.List&lt;<a href="../rel/RelReferentialConstraint.html" title="interface in org.apache.calcite.rel">RelReferentialConstraint</a>&gt;&nbsp;getReferentialConstraints()</pre>
<div class="block">Returns the referential constraints existing for this table. These constraints
are represented over other tables using <a href="../rel/RelReferentialConstraint.html" title="interface in org.apache.calcite.rel"><code>RelReferentialConstraint</code></a> nodes.</div>
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<h4>getExpression</h4>
<pre class="methodSignature"><a href="../linq4j/tree/Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;getExpression&#8203;(java.lang.Class&nbsp;clazz)</pre>
<div class="block">Generates code for this table.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>clazz</code> - The desired collection class; for example <code>Queryable</code>.</dd>
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<h4>extend</h4>
<pre class="methodSignature"><a href="RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a>&nbsp;extend&#8203;(java.util.List&lt;<a href="../rel/type/RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&gt;&nbsp;extendedFields)</pre>
<div class="block">Returns a table with the given extra fields.
<p>The extended table includes the fields of this base table plus the
extended fields that do not have the same name as a field in the base
table.</div>
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<a id="getColumnStrategies()">
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<h4>getColumnStrategies</h4>
<pre class="methodSignature">java.util.List&lt;<a href="../schema/ColumnStrategy.html" title="enum in org.apache.calcite.schema">ColumnStrategy</a>&gt;&nbsp;getColumnStrategies()</pre>
<div class="block">Returns a list describing how each column is populated. The list has the
same number of entries as there are fields, and is immutable.</div>
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