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<h2 title="Class RelOptRule" class="title">Class RelOptRule</h2>
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<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../org/apache/calcite/plan/volcano/AbstractConverter.ExpandConversionRule.html" title="class in org.apache.calcite.plan.volcano">AbstractConverter.ExpandConversionRule</a>, <a href="../../../../org/apache/calcite/rel/rules/AbstractJoinExtractFilterRule.html" title="class in org.apache.calcite.rel.rules">AbstractJoinExtractFilterRule</a>, <a href="../../../../org/apache/calcite/rel/rules/AggregateCaseToFilterRule.html" title="class in org.apache.calcite.rel.rules">AggregateCaseToFilterRule</a>, <a href="../../../../org/apache/calcite/rel/rules/AggregateExpandDistinctAggregatesRule.html" title="class in org.apache.calcite.rel.rules">AggregateExpandDistinctAggregatesRule</a>, <a href="../../../../org/apache/calcite/rel/rules/AggregateExtractProjectRule.html" title="class in org.apache.calcite.rel.rules">AggregateExtractProjectRule</a>, <a href="../../../../org/apache/calcite/rel/rules/AggregateFilterTransposeRule.html" title="class in 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<pre>public abstract class <span class="typeNameLabel">RelOptRule</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">A <code>RelOptRule</code> transforms an expression into another. It has a
list of <a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan"><code>RelOptRuleOperand</code></a>s, which determine whether the rule can be
applied to a particular section of the tree.
<p>The optimizer figures out which rules are applicable, then calls
<a href="../../../../org/apache/calcite/plan/RelOptRule.html#onMatch-org.apache.calcite.plan.RelOptRuleCall-"><code>onMatch(org.apache.calcite.plan.RelOptRuleCall)</code></a> on each of them.</p></div>
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<h3>Field Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation">
<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#description">description</a></span></code>
<div class="block">Description of rule, must be unique within planner.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#operands">operands</a></span></code>
<div class="block">Flattened list of operands.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#relBuilderFactory">relBuilderFactory</a></span></code>
<div class="block">Factory for a builder for relational expressions.</div>
</td>
</tr>
</table>
</li>
</ul>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<ul class="blockList">
<li class="blockList"><a name="constructor.summary">
<!-- -->
</a>
<h3>Constructor Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#RelOptRule-org.apache.calcite.plan.RelOptRuleOperand-">RelOptRule</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;operand)</code>
<div class="block">Creates a rule.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#RelOptRule-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.tools.RelBuilderFactory-java.lang.String-">RelOptRule</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;operand,
<a href="../../../../org/apache/calcite/tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a>&nbsp;relBuilderFactory,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;description)</code>
<div class="block">Creates a rule with an explicit description.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#RelOptRule-org.apache.calcite.plan.RelOptRuleOperand-java.lang.String-">RelOptRule</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;operand,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;description)</code>
<div class="block">Creates a rule with an explicit description.</div>
</td>
</tr>
</table>
</li>
</ul>
<!-- ========== METHOD SUMMARY =========== -->
<ul class="blockList">
<li class="blockList"><a name="method.summary">
<!-- -->
</a>
<h3>Method Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>static <a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#any--">any</a></span>()</code>
<div class="block">Creates a list of child operands that signifies that the operand matches
any number of child relational expressions.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#convert-org.apache.calcite.rel.RelNode-org.apache.calcite.plan.RelTrait-">convert</a></span>(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;toTrait)</code>
<div class="block">Converts one trait of a relational expression, if it does not
already have that trait.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>static <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#convert-org.apache.calcite.rel.RelNode-org.apache.calcite.plan.RelTraitSet-">convert</a></span>(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel,
<a href="../../../../org/apache/calcite/plan/RelTraitSet.html" title="class in org.apache.calcite.plan">RelTraitSet</a>&nbsp;toTraits)</code>
<div class="block">Converts a relation expression to a given set of traits, if it does not
already have those traits.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#convertList-java.util.List-org.apache.calcite.plan.RelTrait-">convertList</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;rels,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait)</code>
<div class="block">Converts a list of relational expressions.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>protected static &lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;<br>org.apache.calcite.plan.RelOptRule.ConverterRelOptRuleOperand</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#convertOperand-java.lang.Class-java.util.function.Predicate-org.apache.calcite.plan.RelTrait-">convertOperand</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Predicate.html?is-external=true" title="class or interface in java.util.function">Predicate</a>&lt;? super R&gt;&nbsp;predicate,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait)</code>
<div class="block">Creates an operand for a converter rule.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>protected static &lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;<br>org.apache.calcite.plan.RelOptRule.ConverterRelOptRuleOperand</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#convertOperand-java.lang.Class-com.google.common.base.Predicate-org.apache.calcite.plan.RelTrait-">convertOperand</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
com.google.common.base.Predicate&lt;? super R&gt;&nbsp;predicate,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">Use <a href="../../../../org/apache/calcite/plan/RelOptRule.html#convertOperand-java.lang.Class-com.google.common.base.Predicate-org.apache.calcite.plan.RelTrait-"><code>convertOperand(Class, Predicate, RelTrait)</code></a>.</span></div>
</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#equals-java.lang.Object-">equals</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;obj)</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#equals-org.apache.calcite.plan.RelOptRule-">equals</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a>&nbsp;that)</code>
<div class="block">Returns whether this rule is equal to another rule.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#getOperand--">getOperand</a></span>()</code>
<div class="block">Returns the root operand of this rule</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#getOperands--">getOperands</a></span>()</code>
<div class="block">Returns a flattened list of operands of this rule.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/plan/Convention.html" title="interface in org.apache.calcite.plan">Convention</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#getOutConvention--">getOutConvention</a></span>()</code>
<div class="block">Returns the convention of the result of firing this rule, null if
not known.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#getOutTrait--">getOutTrait</a></span>()</code>
<div class="block">Returns the trait which will be modified as a result of firing this rule,
or null if the rule is not a converter rule.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#hashCode--">hashCode</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#matches-org.apache.calcite.plan.RelOptRuleCall-">matches</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a>&nbsp;call)</code>
<div class="block">Returns whether this rule could possibly match the given operands.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>static <a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#none--">none</a></span>()</code>
<div class="block">Creates an empty list of child operands.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#onMatch-org.apache.calcite.plan.RelOptRuleCall-">onMatch</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a>&nbsp;call)</code>
<div class="block">Receives notification about a rule match.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>static &lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;<br><a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#operand-java.lang.Class-org.apache.calcite.plan.RelOptRuleOperandChildren-">operand</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a>&nbsp;operandList)</code>
<div class="block">Creates an operand that matches a relational expression that has no
children.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>static &lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;<br><a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#operand-java.lang.Class-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.plan.RelOptRuleOperand...-">operand</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;first,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>...&nbsp;rest)</code>
<div class="block">Creates an operand that matches a relational expression with a given
list of children.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>static &lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;<br><a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#operand-java.lang.Class-org.apache.calcite.plan.RelTrait-com.google.common.base.Predicate-org.apache.calcite.plan.RelOptRuleOperandChildren-">operand</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait,
com.google.common.base.Predicate&lt;? super R&gt;&nbsp;predicate,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a>&nbsp;operandList)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">Use <a href="../../../../org/apache/calcite/plan/RelOptRule.html#operandJ-java.lang.Class-org.apache.calcite.plan.RelTrait-java.util.function.Predicate-org.apache.calcite.plan.RelOptRuleOperandChildren-"><code>operandJ(java.lang.Class&lt;R&gt;, org.apache.calcite.plan.RelTrait, java.util.function.Predicate&lt;? super R&gt;, org.apache.calcite.plan.RelOptRuleOperandChildren)</code></a></span></div>
</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>static &lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;<br><a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#operand-java.lang.Class-org.apache.calcite.plan.RelTrait-com.google.common.base.Predicate-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.plan.RelOptRuleOperand...-">operand</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait,
com.google.common.base.Predicate&lt;? super R&gt;&nbsp;predicate,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;first,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>...&nbsp;rest)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code>static &lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;<br><a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#operand-java.lang.Class-org.apache.calcite.plan.RelTrait-org.apache.calcite.plan.RelOptRuleOperandChildren-">operand</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a>&nbsp;operandList)</code>
<div class="block">Creates an operand that matches a relational expression that has no
children.</div>
</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code>static &lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;<br><a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#operandJ-java.lang.Class-org.apache.calcite.plan.RelTrait-java.util.function.Predicate-org.apache.calcite.plan.RelOptRuleOperandChildren-">operandJ</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Predicate.html?is-external=true" title="class or interface in java.util.function">Predicate</a>&lt;? super R&gt;&nbsp;predicate,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a>&nbsp;operandList)</code>
<div class="block">Creates an operand that matches a relational expression that has a
particular trait and predicate.</div>
</td>
</tr>
<tr id="i22" class="altColor">
<td class="colFirst"><code>static &lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;<br><a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#operandJ-java.lang.Class-org.apache.calcite.plan.RelTrait-java.util.function.Predicate-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.plan.RelOptRuleOperand...-">operandJ</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Predicate.html?is-external=true" title="class or interface in java.util.function">Predicate</a>&lt;? super R&gt;&nbsp;predicate,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;first,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>...&nbsp;rest)</code>
<div class="block">Creates an operand that matches a relational expression that has no
children.</div>
</td>
</tr>
<tr id="i23" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#some-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.plan.RelOptRuleOperand...-">some</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;first,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>...&nbsp;rest)</code>
<div class="block">Creates a list of child operands that matches child relational
expressions in the order they appear.</div>
</td>
</tr>
<tr id="i24" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#toString--">toString</a></span>()</code>
<div class="block">Returns the description of this rule.</div>
</td>
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<td class="colFirst"><code>static <a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/RelOptRule.html#unordered-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.plan.RelOptRuleOperand...-">unordered</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;first,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>...&nbsp;rest)</code>
<div class="block">Creates a list of child operands that matches child relational
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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<pre>protected final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> description</pre>
<div class="block">Description of rule, must be unique within planner. Default is the name
of the class sans package name, but derived classes are encouraged to
override.</div>
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<pre>public final&nbsp;<a href="../../../../org/apache/calcite/tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a> relBuilderFactory</pre>
<div class="block">Factory for a builder for relational expressions.
<p>The actual builder is available via <a href="../../../../org/apache/calcite/plan/RelOptRuleCall.html#builder--"><code>RelOptRuleCall.builder()</code></a>.</div>
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<pre>public final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&gt; operands</pre>
<div class="block">Flattened list of operands.</div>
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<pre>public&nbsp;RelOptRule(<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;operand)</pre>
<div class="block">Creates a rule.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>operand</code> - root operand, must not be null</dd>
</dl>
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<pre>public&nbsp;RelOptRule(<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;operand,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;description)</pre>
<div class="block">Creates a rule with an explicit description.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>operand</code> - root operand, must not be null</dd>
<dd><code>description</code> - Description, or null to guess description</dd>
</dl>
</li>
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<pre>public&nbsp;RelOptRule(<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;operand,
<a href="../../../../org/apache/calcite/tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a>&nbsp;relBuilderFactory,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;description)</pre>
<div class="block">Creates a rule with an explicit description.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>operand</code> - root operand, must not be null</dd>
<dd><code>description</code> - Description, or null to guess description</dd>
<dd><code>relBuilderFactory</code> - Builder for relational expressions</dd>
</dl>
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<pre>public static&nbsp;&lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;operand(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a>&nbsp;operandList)</pre>
<div class="block">Creates an operand that matches a relational expression that has no
children.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>R</code> - Class of relational expression to match</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>clazz</code> - Class of relational expression to match (must not be null)</dd>
<dd><code>operandList</code> - Child operands</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Operand that matches a relational expression that has no
children</dd>
</dl>
</li>
</ul>
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<pre>public static&nbsp;&lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;operand(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a>&nbsp;operandList)</pre>
<div class="block">Creates an operand that matches a relational expression that has no
children.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>R</code> - Class of relational expression to match</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>clazz</code> - Class of relational expression to match (must not be null)</dd>
<dd><code>trait</code> - Trait to match, or null to match any trait</dd>
<dd><code>operandList</code> - Child operands</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Operand that matches a relational expression that has no
children</dd>
</dl>
</li>
</ul>
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<pre>public static&nbsp;&lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;operandJ(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Predicate.html?is-external=true" title="class or interface in java.util.function">Predicate</a>&lt;? super R&gt;&nbsp;predicate,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a>&nbsp;operandList)</pre>
<div class="block">Creates an operand that matches a relational expression that has a
particular trait and predicate.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>R</code> - Class of relational expression to match</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>clazz</code> - Class of relational expression to match (must not be null)</dd>
<dd><code>trait</code> - Trait to match, or null to match any trait</dd>
<dd><code>predicate</code> - Additional match predicate</dd>
<dd><code>operandList</code> - Child operands</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Operand that matches a relational expression that has a
particular trait and predicate</dd>
</dl>
</li>
</ul>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public static&nbsp;&lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;operand(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait,
com.google.common.base.Predicate&lt;? super R&gt;&nbsp;predicate,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a>&nbsp;operandList)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">Use <a href="../../../../org/apache/calcite/plan/RelOptRule.html#operandJ-java.lang.Class-org.apache.calcite.plan.RelTrait-java.util.function.Predicate-org.apache.calcite.plan.RelOptRuleOperandChildren-"><code>operandJ(java.lang.Class&lt;R&gt;, org.apache.calcite.plan.RelTrait, java.util.function.Predicate&lt;? super R&gt;, org.apache.calcite.plan.RelOptRuleOperandChildren)</code></a></span></div>
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<pre>public static&nbsp;&lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;operandJ(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Predicate.html?is-external=true" title="class or interface in java.util.function">Predicate</a>&lt;? super R&gt;&nbsp;predicate,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;first,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>...&nbsp;rest)</pre>
<div class="block">Creates an operand that matches a relational expression that has no
children.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>R</code> - Class of relational expression to match</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>clazz</code> - Class of relational expression to match (must not be null)</dd>
<dd><code>trait</code> - Trait to match, or null to match any trait</dd>
<dd><code>predicate</code> - Additional match predicate</dd>
<dd><code>first</code> - First operand</dd>
<dd><code>rest</code> - Rest operands</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Operand</dd>
</dl>
</li>
</ul>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public static&nbsp;&lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;operand(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait,
com.google.common.base.Predicate&lt;? super R&gt;&nbsp;predicate,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;first,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>...&nbsp;rest)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</li>
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<pre>public static&nbsp;&lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;operand(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;first,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>...&nbsp;rest)</pre>
<div class="block">Creates an operand that matches a relational expression with a given
list of children.
<p>Shorthand for <code>operand(clazz, some(...))</code>.
<p>If you wish to match a relational expression that has no children
(that is, a leaf node), write <code>operand(clazz, none())</code></p>.
<p>If you wish to match a relational expression that has any number of
children, write <code>operand(clazz, any())</code></p>.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>R</code> - Class of relational expression to match</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>clazz</code> - Class of relational expression to match (must not be null)</dd>
<dd><code>first</code> - First operand</dd>
<dd><code>rest</code> - Rest operands</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Operand that matches a relational expression with a given
list of children</dd>
</dl>
</li>
</ul>
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<pre>protected static&nbsp;&lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;org.apache.calcite.plan.RelOptRule.ConverterRelOptRuleOperand&nbsp;convertOperand(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Predicate.html?is-external=true" title="class or interface in java.util.function">Predicate</a>&lt;? super R&gt;&nbsp;predicate,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait)</pre>
<div class="block">Creates an operand for a converter rule.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>clazz</code> - Class of relational expression to match (must not be null)</dd>
<dd><code>trait</code> - Trait to match, or null to match any trait</dd>
<dd><code>predicate</code> - Predicate to apply to relational expression</dd>
</dl>
</li>
</ul>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
protected static&nbsp;&lt;R extends <a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;org.apache.calcite.plan.RelOptRule.ConverterRelOptRuleOperand&nbsp;convertOperand(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;R&gt;&nbsp;clazz,
com.google.common.base.Predicate&lt;? super R&gt;&nbsp;predicate,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">Use <a href="../../../../org/apache/calcite/plan/RelOptRule.html#convertOperand-java.lang.Class-com.google.common.base.Predicate-org.apache.calcite.plan.RelTrait-"><code>convertOperand(Class, Predicate, RelTrait)</code></a>.</span></div>
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<pre>public static&nbsp;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a>&nbsp;some(<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;first,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>...&nbsp;rest)</pre>
<div class="block">Creates a list of child operands that matches child relational
expressions in the order they appear.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>first</code> - First child operand</dd>
<dd><code>rest</code> - Remaining child operands (may be empty)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>List of child operands that matches child relational
expressions in the order</dd>
</dl>
</li>
</ul>
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<pre>public static&nbsp;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a>&nbsp;unordered(<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;first,
<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>...&nbsp;rest)</pre>
<div class="block">Creates a list of child operands that matches child relational
expressions in any order.
<p>This is useful when matching a relational expression which
can have a variable number of children. For example, the rule to
eliminate empty children of a Union would have operands</p>
<blockquote>Operand(Union, true, Operand(Empty))</blockquote>
<p>and given the relational expressions</p>
<blockquote>Union(LogicalFilter, Empty, LogicalProject)</blockquote>
<p>would fire the rule with arguments</p>
<blockquote>{Union, Empty}</blockquote>
<p>It is up to the rule to deduce the other children, or indeed the
position of the matched child.</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>first</code> - First child operand</dd>
<dd><code>rest</code> - Remaining child operands (may be empty)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>List of child operands that matches child relational
expressions in any order</dd>
</dl>
</li>
</ul>
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<pre>public static&nbsp;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a>&nbsp;none()</pre>
<div class="block">Creates an empty list of child operands.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Empty list of child operands</dd>
</dl>
</li>
</ul>
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<h4>any</h4>
<pre>public static&nbsp;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperandChildren.html" title="class in org.apache.calcite.plan">RelOptRuleOperandChildren</a>&nbsp;any()</pre>
<div class="block">Creates a list of child operands that signifies that the operand matches
any number of child relational expressions.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>List of child operands that signifies that the operand matches
any number of child relational expressions</dd>
</dl>
</li>
</ul>
<a name="getOperand--">
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<h4>getOperand</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&nbsp;getOperand()</pre>
<div class="block">Returns the root operand of this rule</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the root operand of this rule</dd>
</dl>
</li>
</ul>
<a name="getOperands--">
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<h4>getOperands</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/apache/calcite/plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a>&gt;&nbsp;getOperands()</pre>
<div class="block">Returns a flattened list of operands of this rule.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>flattened list of operands</dd>
</dl>
</li>
</ul>
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<pre>public&nbsp;int&nbsp;hashCode()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
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<h4>equals</h4>
<pre>public&nbsp;boolean&nbsp;equals(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;obj)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
</dl>
</li>
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<h4>equals</h4>
<pre>protected&nbsp;boolean&nbsp;equals(<a href="../../../../org/apache/calcite/plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a>&nbsp;that)</pre>
<div class="block">Returns whether this rule is equal to another rule.
<p>The base implementation checks that the rules have the same class and
that the operands are equal; derived classes can override.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>that</code> - Another rule</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Whether this rule is equal to another rule</dd>
</dl>
</li>
</ul>
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<h4>matches</h4>
<pre>public&nbsp;boolean&nbsp;matches(<a href="../../../../org/apache/calcite/plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a>&nbsp;call)</pre>
<div class="block">Returns whether this rule could possibly match the given operands.
<p>This method is an opportunity to apply side-conditions to a rule. The
<a href="../../../../org/apache/calcite/plan/RelOptPlanner.html" title="interface in org.apache.calcite.plan"><code>RelOptPlanner</code></a> calls this method after matching all operands of
the rule, and before calling <a href="../../../../org/apache/calcite/plan/RelOptRule.html#onMatch-org.apache.calcite.plan.RelOptRuleCall-"><code>onMatch(RelOptRuleCall)</code></a>.
<p>In implementations of <a href="../../../../org/apache/calcite/plan/RelOptPlanner.html" title="interface in org.apache.calcite.plan"><code>RelOptPlanner</code></a> which may queue up a
matched <a href="../../../../org/apache/calcite/plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan"><code>RelOptRuleCall</code></a> for a long time before calling
<a href="../../../../org/apache/calcite/plan/RelOptRule.html#onMatch-org.apache.calcite.plan.RelOptRuleCall-"><code>onMatch(RelOptRuleCall)</code></a>, this method is beneficial because it
allows the planner to discard rules earlier in the process.
<p>The default implementation of this method returns <code>true</code>.
It is acceptable for any implementation of this method to give a false
positives, that is, to say that the rule matches the operands but have
<a href="../../../../org/apache/calcite/plan/RelOptRule.html#onMatch-org.apache.calcite.plan.RelOptRuleCall-"><code>onMatch(RelOptRuleCall)</code></a> subsequently not generate any
successors.
<p>The following script is useful to identify rules which commonly
produce no successors. You should override this method for these rules:
<blockquote>
<pre><code>awk '
/Apply rule/ {rule=$4; ruleCount[rule]++;}
/generated 0 successors/ {ruleMiss[rule]++;}
END {
printf "%-30s %s %s\n", "Rule", "Fire", "Miss";
for (i in ruleCount) {
printf "%-30s %5d %5d\n", i, ruleCount[i], ruleMiss[i];
}
} ' FarragoTrace.log</code></pre>
</blockquote></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>call</code> - Rule call which has been determined to match all operands of
this rule</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether this RelOptRule matches a given RelOptRuleCall</dd>
</dl>
</li>
</ul>
<a name="onMatch-org.apache.calcite.plan.RelOptRuleCall-">
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<h4>onMatch</h4>
<pre>public abstract&nbsp;void&nbsp;onMatch(<a href="../../../../org/apache/calcite/plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a>&nbsp;call)</pre>
<div class="block">Receives notification about a rule match. At the time that this method is
called, <a href="../../../../org/apache/calcite/plan/RelOptRuleCall.html#rels"><code>call.rels</code></a> holds the set of relational
expressions which match the operands to the rule; <code>
call.rels[0]</code> is the root expression.
<p>Typically a rule would check that the nodes are valid matches, creates
a new expression, then calls back <a href="../../../../org/apache/calcite/plan/RelOptRuleCall.html#transformTo-org.apache.calcite.rel.RelNode-java.util.Map-org.apache.calcite.plan.RelHintsPropagator-"><code>RelOptRuleCall.transformTo(org.apache.calcite.rel.RelNode, java.util.Map&lt;org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelNode&gt;, org.apache.calcite.plan.RelHintsPropagator)</code></a> to
register the expression.</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>call</code> - Rule call</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/apache/calcite/plan/RelOptRule.html#matches-org.apache.calcite.plan.RelOptRuleCall-"><code>matches(RelOptRuleCall)</code></a></dd>
</dl>
</li>
</ul>
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<h4>getOutConvention</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/plan/Convention.html" title="interface in org.apache.calcite.plan">Convention</a>&nbsp;getOutConvention()</pre>
<div class="block">Returns the convention of the result of firing this rule, null if
not known.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Convention of the result of firing this rule, null if
not known</dd>
</dl>
</li>
</ul>
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<pre>public&nbsp;<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;getOutTrait()</pre>
<div class="block">Returns the trait which will be modified as a result of firing this rule,
or null if the rule is not a converter rule.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Trait which will be modified as a result of firing this rule,
or null if the rule is not a converter rule</dd>
</dl>
</li>
</ul>
<a name="toString--">
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<h4>toString</h4>
<pre>public final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;toString()</pre>
<div class="block">Returns the description of this rule.
<p>It must be unique (for rules that are not equal) and must consist of
only the characters A-Z, a-z, 0-9, '_', '.', '(', ')', '-', ',', '[', ']', ':', ' '.
It must start with a letter.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
</dl>
</li>
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<h4>convert</h4>
<pre>public static&nbsp;<a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;convert(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel,
<a href="../../../../org/apache/calcite/plan/RelTraitSet.html" title="class in org.apache.calcite.plan">RelTraitSet</a>&nbsp;toTraits)</pre>
<div class="block">Converts a relation expression to a given set of traits, if it does not
already have those traits.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rel</code> - Relational expression to convert</dd>
<dd><code>toTraits</code> - desired traits</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a relational expression with the desired traits; never null</dd>
</dl>
</li>
</ul>
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<pre>public static&nbsp;<a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;convert(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;toTrait)</pre>
<div class="block">Converts one trait of a relational expression, if it does not
already have that trait.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rel</code> - Relational expression to convert</dd>
<dd><code>toTrait</code> - Desired trait</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a relational expression with the desired trait; never null</dd>
</dl>
</li>
</ul>
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<h4>convertList</h4>
<pre>protected static&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;convertList(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;rels,
<a href="../../../../org/apache/calcite/plan/RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait)</pre>
<div class="block">Converts a list of relational expressions.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rels</code> - Relational expressions</dd>
<dd><code>trait</code> - Trait to add to each relational expression</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>List of converted relational expressions, never null</dd>
</dl>
</li>
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