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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rel.rules</a></div> |
| <h2 title="Class FilterProjectTransposeRule" class="title">Class FilterProjectTransposeRule</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">org.apache.calcite.plan.RelOptRule</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.calcite.rel.rules.FilterProjectTransposeRule</li> |
| </ul> |
| </li> |
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| <dt>Direct Known Subclasses:</dt> |
| <dd><code><a href="../../adapter/druid/DruidRules.DruidFilterProjectTransposeRule.html" title="class in org.apache.calcite.adapter.druid">DruidRules.DruidFilterProjectTransposeRule</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public class <span class="typeNameLabel">FilterProjectTransposeRule</span> |
| extends <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></pre> |
| <div class="block">Planner rule that pushes |
| a <a href="../core/Filter.html" title="class in org.apache.calcite.rel.core"><code>Filter</code></a> |
| past a <a href="../core/Project.html" title="class in org.apache.calcite.rel.core"><code>Project</code></a>.</div> |
| </li> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Field</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#copyFilter">copyFilter</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#copyProject">copyProject</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="FilterProjectTransposeRule.html" title="class in org.apache.calcite.rel.rules">FilterProjectTransposeRule</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#INSTANCE">INSTANCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">The default instance of |
| <a href="FilterProjectTransposeRule.html" title="class in org.apache.calcite.rel.rules"><code>FilterProjectTransposeRule</code></a>.</div> |
| </td> |
| </tr> |
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| </a> |
| <h3>Fields inherited from class org.apache.calcite.plan.<a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></h3> |
| <code><a href="../../plan/RelOptRule.html#description">description</a>, <a href="../../plan/RelOptRule.html#operands">operands</a>, <a href="../../plan/RelOptRule.html#relBuilderFactory">relBuilderFactory</a></code></li> |
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| </li> |
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| </section> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier</th> |
| <th class="colSecond" scope="col">Constructor</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code> </code></td> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.Class,java.lang.Class,boolean,boolean,org.apache.calcite.tools.RelBuilderFactory)">FilterProjectTransposeRule</a></span>​(java.lang.Class<? extends <a href="../core/Filter.html" title="class in org.apache.calcite.rel.core">Filter</a>> filterClass, |
| java.lang.Class<? extends <a href="../core/Project.html" title="class in org.apache.calcite.rel.core">Project</a>> projectClass, |
| boolean copyFilter, |
| boolean copyProject, |
| <a href="../../tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a> relBuilderFactory)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a FilterProjectTransposeRule.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code> </code></td> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.Class,org.apache.calcite.rel.core.RelFactories.FilterFactory,java.lang.Class,org.apache.calcite.rel.core.RelFactories.ProjectFactory)">FilterProjectTransposeRule</a></span>​(java.lang.Class<? extends <a href="../core/Filter.html" title="class in org.apache.calcite.rel.core">Filter</a>> filterClass, |
| <a href="../core/RelFactories.FilterFactory.html" title="interface in org.apache.calcite.rel.core">RelFactories.FilterFactory</a> filterFactory, |
| java.lang.Class<? extends <a href="../core/Project.html" title="class in org.apache.calcite.rel.core">Project</a>> projectClass, |
| <a href="../core/RelFactories.ProjectFactory.html" title="interface in org.apache.calcite.rel.core">RelFactories.ProjectFactory</a> projectFactory)</code></th> |
| <td class="colLast"> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span></div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code> </code></td> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.Class,java.util.function.Predicate,java.lang.Class,java.util.function.Predicate,boolean,boolean,org.apache.calcite.tools.RelBuilderFactory)">FilterProjectTransposeRule</a></span>​(java.lang.Class<F> filterClass, |
| java.util.function.Predicate<? super F> filterPredicate, |
| java.lang.Class<P> projectClass, |
| java.util.function.Predicate<? super P> projectPredicate, |
| boolean copyFilter, |
| boolean copyProject, |
| <a href="../../tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a> relBuilderFactory)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a FilterProjectTransposeRule.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>protected </code></td> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.apache.calcite.plan.RelOptRuleOperand,boolean,boolean,org.apache.calcite.tools.RelBuilderFactory)">FilterProjectTransposeRule</a></span>​(<a href="../../plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a> operand, |
| boolean copyFilter, |
| boolean copyProject, |
| <a href="../../tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a> relBuilderFactory)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <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="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#onMatch(org.apache.calcite.plan.RelOptRuleCall)">onMatch</a></span>​(<a href="../../plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a> call)</code></th> |
| <td class="colLast"> |
| <div class="block">Receives notification about a rule match.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#simplifyFilterCondition(org.apache.calcite.rex.RexNode,org.apache.calcite.plan.RelOptRuleCall)">simplifyFilterCondition</a></span>​(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> condition, |
| <a href="../../plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a> call)</code></th> |
| <td class="colLast"> |
| <div class="block">Simplifies the filter condition using a simplifier created by the |
| information in the current call.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
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| <!-- --> |
| </a> |
| <h3>Methods inherited from class org.apache.calcite.plan.<a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></h3> |
| <code><a href="../../plan/RelOptRule.html#any()">any</a>, <a href="../../plan/RelOptRule.html#convert(org.apache.calcite.rel.RelNode,org.apache.calcite.plan.RelTrait)">convert</a>, <a href="../../plan/RelOptRule.html#convert(org.apache.calcite.rel.RelNode,org.apache.calcite.plan.RelTraitSet)">convert</a>, <a href="../../plan/RelOptRule.html#convertList(java.util.List,org.apache.calcite.plan.RelTrait)">convertList</a>, <a href="../../plan/RelOptRule.html#convertOperand(java.lang.Class,com.google.common.base.Predicate,org.apache.calcite.plan.RelTrait)">convertOperand</a>, <a href="../../plan/RelOptRule.html#convertOperand(java.lang.Class,java.util.function.Predicate,org.apache.calcite.plan.RelTrait)">convertOperand</a>, <a href="../../plan/RelOptRule.html#equals(java.lang.Object)">equals</a>, <a href="../../plan/RelOptRule.html#equals(org.apache.calcite.plan.RelOptRule)">equals</a>, <a href="../../plan/RelOptRule.html#getOperand()">getOperand</a>, <a href="../../plan/RelOptRule.html#getOperands()">getOperands</a>, <a href="../../plan/RelOptRule.html#getOutConvention()">getOutConvention</a>, <a href="../../plan/RelOptRule.html#getOutTrait()">getOutTrait</a>, <a href="../../plan/RelOptRule.html#hashCode()">hashCode</a>, <a href="../../plan/RelOptRule.html#matches(org.apache.calcite.plan.RelOptRuleCall)">matches</a>, <a href="../../plan/RelOptRule.html#none()">none</a>, <a href="../../plan/RelOptRule.html#operand(java.lang.Class,org.apache.calcite.plan.RelOptRuleOperandChildren)">operand</a>, <a href="../../plan/RelOptRule.html#operand(java.lang.Class,org.apache.calcite.plan.RelOptRuleOperand,org.apache.calcite.plan.RelOptRuleOperand...)">operand</a>, <a href="../../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="../../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="../../plan/RelOptRule.html#operand(java.lang.Class,org.apache.calcite.plan.RelTrait,org.apache.calcite.plan.RelOptRuleOperandChildren)">operand</a>, <a href="../../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="../../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="../../plan/RelOptRule.html#some(org.apache.calcite.plan.RelOptRuleOperand,org.apache.calcite.plan.RelOptRuleOperand...)">some</a>, <a href="../../plan/RelOptRule.html#toString()">toString</a>, <a href="../../plan/RelOptRule.html#unordered(org.apache.calcite.plan.RelOptRuleOperand,org.apache.calcite.plan.RelOptRuleOperand...)">unordered</a></code></li> |
| </ul> |
| <ul class="blockList"> |
| <li class="blockList"><a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, finalize, getClass, notify, notifyAll, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="field.detail"> |
| <!-- --> |
| </a> |
| <h3>Field Detail</h3> |
| <a id="INSTANCE"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>INSTANCE</h4> |
| <pre>public static final <a href="FilterProjectTransposeRule.html" title="class in org.apache.calcite.rel.rules">FilterProjectTransposeRule</a> INSTANCE</pre> |
| <div class="block">The default instance of |
| <a href="FilterProjectTransposeRule.html" title="class in org.apache.calcite.rel.rules"><code>FilterProjectTransposeRule</code></a>. |
| |
| <p>It matches any kind of <a href="../core/Join.html" title="class in org.apache.calcite.rel.core"><code>Join</code></a> or |
| <a href="../core/Filter.html" title="class in org.apache.calcite.rel.core"><code>Filter</code></a>, and generates the same kind of |
| Join and Filter. |
| |
| <p>It does not allow a Filter to be pushed past the Project if |
| <a href="../../rex/RexUtil.html#containsCorrelation(org.apache.calcite.rex.RexNode)"><code>there is a correlation condition</code></a>) |
| anywhere in the Filter, since in some cases it can prevent a |
| <a href="../core/Correlate.html" title="class in org.apache.calcite.rel.core"><code>Correlate</code></a> from being de-correlated.</div> |
| </li> |
| </ul> |
| <a id="copyFilter"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>copyFilter</h4> |
| <pre>private final boolean copyFilter</pre> |
| </li> |
| </ul> |
| <a id="copyProject"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>copyProject</h4> |
| <pre>private final boolean copyProject</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="constructor.detail"> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a id="<init>(java.lang.Class,java.lang.Class,boolean,boolean,org.apache.calcite.tools.RelBuilderFactory)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>FilterProjectTransposeRule</h4> |
| <pre>public FilterProjectTransposeRule​(java.lang.Class<? extends <a href="../core/Filter.html" title="class in org.apache.calcite.rel.core">Filter</a>> filterClass, |
| java.lang.Class<? extends <a href="../core/Project.html" title="class in org.apache.calcite.rel.core">Project</a>> projectClass, |
| boolean copyFilter, |
| boolean copyProject, |
| <a href="../../tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a> relBuilderFactory)</pre> |
| <div class="block">Creates a FilterProjectTransposeRule. |
| |
| <p>Equivalent to the rule created by |
| <a href="#%3Cinit%3E(java.lang.Class,java.util.function.Predicate,java.lang.Class,java.util.function.Predicate,boolean,boolean,org.apache.calcite.tools.RelBuilderFactory)"><code>FilterProjectTransposeRule(Class, Predicate, Class, Predicate, boolean, boolean, RelBuilderFactory)</code></a> |
| with some default predicates that do not allow a filter to be pushed |
| past the project if there is a correlation condition anywhere in the |
| filter (since in some cases it can prevent a |
| <a href="../core/Correlate.html" title="class in org.apache.calcite.rel.core"><code>Correlate</code></a> from being de-correlated).</div> |
| </li> |
| </ul> |
| <a id="<init>(java.lang.Class,java.util.function.Predicate,java.lang.Class,java.util.function.Predicate,boolean,boolean,org.apache.calcite.tools.RelBuilderFactory)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>FilterProjectTransposeRule</h4> |
| <pre>public FilterProjectTransposeRule​(java.lang.Class<F> filterClass, |
| java.util.function.Predicate<? super F> filterPredicate, |
| java.lang.Class<P> projectClass, |
| java.util.function.Predicate<? super P> projectPredicate, |
| boolean copyFilter, |
| boolean copyProject, |
| <a href="../../tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a> relBuilderFactory)</pre> |
| <div class="block">Creates a FilterProjectTransposeRule. |
| |
| <p>If <code>copyFilter</code> is true, creates the same kind of Filter as |
| matched in the rule, otherwise it creates a Filter using the RelBuilder |
| obtained by the <code>relBuilderFactory</code>. |
| Similarly for <code>copyProject</code>. |
| |
| <p>Defining predicates for the Filter (using <code>filterPredicate</code>) |
| and/or the Project (using <code>projectPredicate</code> allows making the rule |
| more restrictive.</div> |
| </li> |
| </ul> |
| <a id="<init>(java.lang.Class,org.apache.calcite.rel.core.RelFactories.FilterFactory,java.lang.Class,org.apache.calcite.rel.core.RelFactories.ProjectFactory)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>FilterProjectTransposeRule</h4> |
| <pre>@Deprecated |
| public FilterProjectTransposeRule​(java.lang.Class<? extends <a href="../core/Filter.html" title="class in org.apache.calcite.rel.core">Filter</a>> filterClass, |
| <a href="../core/RelFactories.FilterFactory.html" title="interface in org.apache.calcite.rel.core">RelFactories.FilterFactory</a> filterFactory, |
| java.lang.Class<? extends <a href="../core/Project.html" title="class in org.apache.calcite.rel.core">Project</a>> projectClass, |
| <a href="../core/RelFactories.ProjectFactory.html" title="interface in org.apache.calcite.rel.core">RelFactories.ProjectFactory</a> projectFactory)</pre> |
| <div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span></div> |
| </li> |
| </ul> |
| <a id="<init>(org.apache.calcite.plan.RelOptRuleOperand,boolean,boolean,org.apache.calcite.tools.RelBuilderFactory)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>FilterProjectTransposeRule</h4> |
| <pre>protected FilterProjectTransposeRule​(<a href="../../plan/RelOptRuleOperand.html" title="class in org.apache.calcite.plan">RelOptRuleOperand</a> operand, |
| boolean copyFilter, |
| boolean copyProject, |
| <a href="../../tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a> relBuilderFactory)</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| <!-- ============ METHOD DETAIL ========== --> |
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| <li class="blockList"><a id="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a id="onMatch(org.apache.calcite.plan.RelOptRuleCall)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>onMatch</h4> |
| <pre class="methodSignature">public void onMatch​(<a href="../../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="../../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="../../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="../../plan/RelOptRuleCall.html#transformTo(org.apache.calcite.rel.RelNode,java.util.Map)"><code>RelOptRuleCall.transformTo(org.apache.calcite.rel.RelNode, java.util.Map<org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelNode>)</code></a> to |
| register the expression.</p></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../plan/RelOptRule.html#onMatch(org.apache.calcite.plan.RelOptRuleCall)">onMatch</a></code> in class <code><a href="../../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="../../plan/RelOptRule.html#matches(org.apache.calcite.plan.RelOptRuleCall)"><code>RelOptRule.matches(RelOptRuleCall)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="simplifyFilterCondition(org.apache.calcite.rex.RexNode,org.apache.calcite.plan.RelOptRuleCall)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>simplifyFilterCondition</h4> |
| <pre class="methodSignature">private <a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> simplifyFilterCondition​(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> condition, |
| <a href="../../plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a> call)</pre> |
| <div class="block">Simplifies the filter condition using a simplifier created by the |
| information in the current call. |
| |
| <p>This method is an attempt to replicate the simplification behavior of |
| <a href="../../tools/RelBuilder.html#filter(org.apache.calcite.rex.RexNode...)"><code>RelBuilder.filter(RexNode...)</code></a> which cannot be used in the case of |
| copying nodes. The main difference with the behavior of that method is that |
| it does not drop entirely the filter if the condition is always false.</div> |
| </li> |
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