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| <div class="subTitle">org.apache.calcite.rel.rules</div> |
| <h2 title="Class ReduceExpressionsRule.FilterReduceExpressionsRule" class="title">Class ReduceExpressionsRule.FilterReduceExpressionsRule</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="class in org.apache.calcite.plan">org.apache.calcite.plan.RelOptRule</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html" title="class in org.apache.calcite.rel.rules">org.apache.calcite.rel.rules.ReduceExpressionsRule</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.calcite.rel.rules.ReduceExpressionsRule.FilterReduceExpressionsRule</li> |
| </ul> |
| </li> |
| </ul> |
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| </li> |
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| <div class="description"> |
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| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../org/apache/calcite/rel/rules/SubstitutionRule.html" title="interface in org.apache.calcite.rel.rules">SubstitutionRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/TransformationRule.html" title="interface in org.apache.calcite.rel.rules">TransformationRule</a></dd> |
| </dl> |
| <dl> |
| <dt>Enclosing class:</dt> |
| <dd><a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html" title="class in org.apache.calcite.rel.rules">ReduceExpressionsRule</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public static class <span class="typeNameLabel">ReduceExpressionsRule.FilterReduceExpressionsRule</span> |
| extends <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html" title="class in org.apache.calcite.rel.rules">ReduceExpressionsRule</a></pre> |
| <div class="block">Rule that reduces constants inside a <a href="../../../../../org/apache/calcite/rel/core/Filter.html" title="class in org.apache.calcite.rel.core"><code>Filter</code></a>. |
| If the condition is a constant, the filter is removed (if TRUE) or replaced with |
| an empty <a href="../../../../../org/apache/calcite/rel/core/Values.html" title="class in org.apache.calcite.rel.core"><code>Values</code></a> (if FALSE or NULL).</div> |
| </li> |
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| <h3>Nested Class Summary</h3> |
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| <li class="blockList"><a name="nested.classes.inherited.from.class.org.apache.calcite.rel.rules.ReduceExpressionsRule"> |
| <!-- --> |
| </a> |
| <h3>Nested classes/interfaces inherited from class org.apache.calcite.rel.rules.<a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html" title="class in org.apache.calcite.rel.rules">ReduceExpressionsRule</a></h3> |
| <code><a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.CalcReduceExpressionsRule.html" title="class in org.apache.calcite.rel.rules">ReduceExpressionsRule.CalcReduceExpressionsRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.CaseShuttle.html" title="class in org.apache.calcite.rel.rules">ReduceExpressionsRule.CaseShuttle</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.FilterReduceExpressionsRule.html" title="class in org.apache.calcite.rel.rules">ReduceExpressionsRule.FilterReduceExpressionsRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.JoinReduceExpressionsRule.html" title="class in org.apache.calcite.rel.rules">ReduceExpressionsRule.JoinReduceExpressionsRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.ProjectReduceExpressionsRule.html" title="class in org.apache.calcite.rel.rules">ReduceExpressionsRule.ProjectReduceExpressionsRule</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.ReducibleExprLocator.html" title="class in org.apache.calcite.rel.rules">ReduceExpressionsRule.ReducibleExprLocator</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.RexReplacer.html" title="class in org.apache.calcite.rel.rules">ReduceExpressionsRule.RexReplacer</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.WindowReduceExpressionsRule.html" title="class in org.apache.calcite.rel.rules">ReduceExpressionsRule.WindowReduceExpressionsRule</a></code></li> |
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| </a> |
| <h3>Fields inherited from class org.apache.calcite.rel.rules.<a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html" title="class in org.apache.calcite.rel.rules">ReduceExpressionsRule</a></h3> |
| <code><a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#CALC_INSTANCE">CALC_INSTANCE</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#EXCLUSION_PATTERN">EXCLUSION_PATTERN</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#FILTER_INSTANCE">FILTER_INSTANCE</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#JOIN_INSTANCE">JOIN_INSTANCE</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#matchNullability">matchNullability</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#PROJECT_INSTANCE">PROJECT_INSTANCE</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#WINDOW_INSTANCE">WINDOW_INSTANCE</a></code></li> |
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| <h3>Fields inherited from class org.apache.calcite.plan.<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></h3> |
| <code><a href="../../../../../org/apache/calcite/plan/RelOptRule.html#description">description</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#operands">operands</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#relBuilderFactory">relBuilderFactory</a></code></li> |
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| <h3>Constructor Summary</h3> |
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| <caption><span>Constructors</span><span class="tabEnd"> </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/rel/rules/ReduceExpressionsRule.FilterReduceExpressionsRule.html#FilterReduceExpressionsRule-java.lang.Class-boolean-org.apache.calcite.tools.RelBuilderFactory-">FilterReduceExpressionsRule</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><? extends <a href="../../../../../org/apache/calcite/rel/core/Filter.html" title="class in org.apache.calcite.rel.core">Filter</a>> filterClass, |
| boolean matchNullability, |
| <a href="../../../../../org/apache/calcite/tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a> relBuilderFactory)</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.FilterReduceExpressionsRule.html#FilterReduceExpressionsRule-java.lang.Class-org.apache.calcite.tools.RelBuilderFactory-">FilterReduceExpressionsRule</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><? extends <a href="../../../../../org/apache/calcite/rel/core/Filter.html" title="class in org.apache.calcite.rel.core">Filter</a>> filterClass, |
| <a href="../../../../../org/apache/calcite/tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a> relBuilderFactory)</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
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| <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"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </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>protected <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/rel/rules/ReduceExpressionsRule.FilterReduceExpressionsRule.html#createEmptyRelOrEquivalent-org.apache.calcite.plan.RelOptRuleCall-org.apache.calcite.rel.core.Filter-">createEmptyRelOrEquivalent</a></span>(<a href="../../../../../org/apache/calcite/plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a> call, |
| <a href="../../../../../org/apache/calcite/rel/core/Filter.html" title="class in org.apache.calcite.rel.core">Filter</a> input)</code> |
| <div class="block">For static schema systems, a filter that is always false or null can be |
| replaced by a values operator that produces no rows, as the schema |
| information can just be taken from the input Rel.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.FilterReduceExpressionsRule.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> call)</code> |
| <div class="block">Receives notification about a rule match.</div> |
| </td> |
| </tr> |
| </table> |
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| <!-- --> |
| </a> |
| <h3>Methods inherited from class org.apache.calcite.rel.rules.<a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html" title="class in org.apache.calcite.rel.rules">ReduceExpressionsRule</a></h3> |
| <code><a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#findReducibleExps-org.apache.calcite.rel.type.RelDataTypeFactory-java.util.List-com.google.common.collect.ImmutableMap-java.util.List-java.util.List-">findReducibleExps</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#predicateConstants-java.lang.Class-org.apache.calcite.rex.RexBuilder-org.apache.calcite.plan.RelOptPredicateList-">predicateConstants</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#pushPredicateIntoCase-org.apache.calcite.rex.RexCall-">pushPredicateIntoCase</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#reduceExpressions-org.apache.calcite.rel.RelNode-java.util.List-org.apache.calcite.plan.RelOptPredicateList-">reduceExpressions</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#reduceExpressions-org.apache.calcite.rel.RelNode-java.util.List-org.apache.calcite.plan.RelOptPredicateList-boolean-">reduceExpressions</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#reduceExpressions-org.apache.calcite.rel.RelNode-java.util.List-org.apache.calcite.plan.RelOptPredicateList-boolean-boolean-">reduceExpressions</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#reduceExpressionsInternal-org.apache.calcite.rel.RelNode-org.apache.calcite.rex.RexSimplify-org.apache.calcite.rex.RexUnknownAs-java.util.List-org.apache.calcite.plan.RelOptPredicateList-">reduceExpressionsInternal</a>, <a href="../../../../../org/apache/calcite/rel/rules/ReduceExpressionsRule.html#substitute-org.apache.calcite.rex.RexCall-int-org.apache.calcite.rex.RexNode-">substitute</a></code></li> |
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| <h3>Methods inherited from class org.apache.calcite.plan.<a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></h3> |
| <code><a href="../../../../../org/apache/calcite/plan/RelOptRule.html#any--">any</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#convert-org.apache.calcite.rel.RelNode-org.apache.calcite.plan.RelTrait-">convert</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#convert-org.apache.calcite.rel.RelNode-org.apache.calcite.plan.RelTraitSet-">convert</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#convertList-java.util.List-org.apache.calcite.plan.RelTrait-">convertList</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#convertOperand-java.lang.Class-java.util.function.Predicate-org.apache.calcite.plan.RelTrait-">convertOperand</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#convertOperand-java.lang.Class-com.google.common.base.Predicate-org.apache.calcite.plan.RelTrait-">convertOperand</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#equals-java.lang.Object-">equals</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#equals-org.apache.calcite.plan.RelOptRule-">equals</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#getOperand--">getOperand</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#getOperands--">getOperands</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#getOutConvention--">getOutConvention</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#getOutTrait--">getOutTrait</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#hashCode--">hashCode</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#matches-org.apache.calcite.plan.RelOptRuleCall-">matches</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#none--">none</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#operand-java.lang.Class-org.apache.calcite.plan.RelOptRuleOperandChildren-">operand</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#operand-java.lang.Class-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.plan.RelOptRuleOperand...-">operand</a>, <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>, <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>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#operand-java.lang.Class-org.apache.calcite.plan.RelTrait-org.apache.calcite.plan.RelOptRuleOperandChildren-">operand</a>, <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>, <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>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#some-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.plan.RelOptRuleOperand...-">some</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#toString--">toString</a>, <a href="../../../../../org/apache/calcite/plan/RelOptRule.html#unordered-org.apache.calcite.plan.RelOptRuleOperand-org.apache.calcite.plan.RelOptRuleOperand...-">unordered</a></code></li> |
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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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| </a> |
| <h3>Methods inherited from interface org.apache.calcite.rel.rules.<a href="../../../../../org/apache/calcite/rel/rules/SubstitutionRule.html" title="interface in org.apache.calcite.rel.rules">SubstitutionRule</a></h3> |
| <code><a href="../../../../../org/apache/calcite/rel/rules/SubstitutionRule.html#autoPruneOld--">autoPruneOld</a></code></li> |
| </ul> |
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| <h3>Constructor Detail</h3> |
| <a name="FilterReduceExpressionsRule-java.lang.Class-org.apache.calcite.tools.RelBuilderFactory-"> |
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| <h4>FilterReduceExpressionsRule</h4> |
| <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 FilterReduceExpressionsRule(<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><? extends <a href="../../../../../org/apache/calcite/rel/core/Filter.html" title="class in org.apache.calcite.rel.core">Filter</a>> filterClass, |
| <a href="../../../../../org/apache/calcite/tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a> relBuilderFactory)</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> </div> |
| </li> |
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| <h4>FilterReduceExpressionsRule</h4> |
| <pre>public FilterReduceExpressionsRule(<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><? extends <a href="../../../../../org/apache/calcite/rel/core/Filter.html" title="class in org.apache.calcite.rel.core">Filter</a>> filterClass, |
| boolean matchNullability, |
| <a href="../../../../../org/apache/calcite/tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a> relBuilderFactory)</pre> |
| </li> |
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| <a name="onMatch-org.apache.calcite.plan.RelOptRuleCall-"> |
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| <h4>onMatch</h4> |
| <pre>public void onMatch(<a href="../../../../../org/apache/calcite/plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a> call)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/calcite/plan/RelOptRule.html#onMatch-org.apache.calcite.plan.RelOptRuleCall-">RelOptRule</a></code></span></div> |
| <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<org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelNode>, org.apache.calcite.plan.RelHintsPropagator)</code></a> to |
| register the expression.</p></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/calcite/plan/RelOptRule.html#onMatch-org.apache.calcite.plan.RelOptRuleCall-">onMatch</a></code> in class <code><a href="../../../../../org/apache/calcite/plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></dd> |
| <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>RelOptRule.matches(RelOptRuleCall)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="createEmptyRelOrEquivalent-org.apache.calcite.plan.RelOptRuleCall-org.apache.calcite.rel.core.Filter-"> |
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| <h4>createEmptyRelOrEquivalent</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> createEmptyRelOrEquivalent(<a href="../../../../../org/apache/calcite/plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a> call, |
| <a href="../../../../../org/apache/calcite/rel/core/Filter.html" title="class in org.apache.calcite.rel.core">Filter</a> input)</pre> |
| <div class="block">For static schema systems, a filter that is always false or null can be |
| replaced by a values operator that produces no rows, as the schema |
| information can just be taken from the input Rel. In dynamic schema |
| environments, the filter might have an unknown input type, in these cases |
| they must define a system specific alternative to a Values operator, such |
| as inserting a limit 0 instead of a filter on top of the original input. |
| |
| <p>The default implementation of this method is to call |
| <a href="../../../../../org/apache/calcite/tools/RelBuilder.html#empty--"><code>RelBuilder.empty()</code></a>, which for the static schema will be optimized |
| to an empty |
| <a href="../../../../../org/apache/calcite/rel/core/Values.html" title="class in org.apache.calcite.rel.core"><code>Values</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>input</code> - rel to replace, assumes caller has already determined |
| equivalence to Values operation for 0 records or a |
| false filter.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>equivalent but less expensive replacement rel</dd> |
| </dl> |
| </li> |
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