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| <div class="aboutLanguage"><b>Apache Calcite</b></div> |
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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rel.rules</a></div> |
| <h1 title="Class PruneEmptyRules" class="title">Class PruneEmptyRules</h1> |
| </div> |
| <div class="contentContainer"> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">java.lang.Object</a> |
| <div class="inheritance">org.apache.calcite.rel.rules.PruneEmptyRules</div> |
| </div> |
| <section class="description"> |
| <hr> |
| <pre>public abstract class <span class="typeNameLabel">PruneEmptyRules</span> |
| extends <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></pre> |
| <div class="block">Collection of rules which remove sections of a query plan known never to |
| produce any rows. |
| |
| <p>Conventionally, the way to represent an empty relational expression is |
| with a <a href="../core/Values.html" title="class in org.apache.calcite.rel.core"><code>Values</code></a> that has no tuples.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../logical/LogicalValues.html#createEmpty(org.apache.calcite.plan.RelOptCluster,org.apache.calcite.rel.type.RelDataType)"><code>LogicalValues.createEmpty(org.apache.calcite.plan.RelOptCluster, org.apache.calcite.rel.type.RelDataType)</code></a></dd> |
| </dl> |
| </section> |
| <section class="summary"> |
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| <!-- ======== NESTED CLASS SUMMARY ======== --> |
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| <h2>Nested Class Summary</h2> |
| <div class="memberSummary"> |
| <table> |
| <caption><span>Nested Classes</span><span class="tabEnd"> </span></caption> |
| <thead> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="PruneEmptyRules.IntersectEmptyPruneRuleConfig.html" title="interface in org.apache.calcite.rel.rules">PruneEmptyRules.IntersectEmptyPruneRuleConfig</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Configuration for a rule that prunes an Intersect if any of its inputs |
| is empty.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="PruneEmptyRules.JoinLeftEmptyRuleConfig.html" title="interface in org.apache.calcite.rel.rules">PruneEmptyRules.JoinLeftEmptyRuleConfig</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Configuration for rule that prunes a join it its left input is |
| empty.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="PruneEmptyRules.JoinRightEmptyRuleConfig.html" title="interface in org.apache.calcite.rel.rules">PruneEmptyRules.JoinRightEmptyRuleConfig</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Configuration for rule that prunes a join it its right input is |
| empty.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="PruneEmptyRules.MinusEmptyPruneRuleConfig.html" title="interface in org.apache.calcite.rel.rules">PruneEmptyRules.MinusEmptyPruneRuleConfig</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Configuration for a rule that prunes empty inputs from a Minus.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="PruneEmptyRules.PruneEmptyRule.html" title="class in org.apache.calcite.rel.rules">PruneEmptyRules.PruneEmptyRule</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Abstract prune empty rule that implements SubstitutionRule interface.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="PruneEmptyRules.RemoveEmptySingleRule.html" title="class in org.apache.calcite.rel.rules">PruneEmptyRules.RemoveEmptySingleRule</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Planner rule that converts a single-rel (e.g.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="PruneEmptyRules.SortFetchZeroRuleConfig.html" title="interface in org.apache.calcite.rel.rules">PruneEmptyRules.SortFetchZeroRuleConfig</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Configuration for a rule that prunes a Sort if it has limit 0.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="PruneEmptyRules.UnionEmptyPruneRuleConfig.html" title="interface in org.apache.calcite.rel.rules">PruneEmptyRules.UnionEmptyPruneRuleConfig</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Configuration for a rule that prunes empty inputs from a Minus.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </section> |
| </li> |
| <!-- =========== FIELD SUMMARY =========== --> |
| <li class="blockList"> |
| <section class="fieldSummary"><a id="field.summary"> |
| <!-- --> |
| </a> |
| <h2>Field Summary</h2> |
| <div class="memberSummary"> |
| <table> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <thead> |
| <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> |
| </thead> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#AGGREGATE_INSTANCE">AGGREGATE_INSTANCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Rule that converts an <a href="../core/Aggregate.html" title="class in org.apache.calcite.rel.core"><code>Aggregate</code></a> |
| to empty if its child is empty.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#FILTER_INSTANCE">FILTER_INSTANCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Rule that converts a <a href="../logical/LogicalFilter.html" title="class in org.apache.calcite.rel.logical"><code>LogicalFilter</code></a> |
| to empty if its child is empty.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#INTERSECT_INSTANCE">INTERSECT_INSTANCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Rule that converts a |
| <a href="../logical/LogicalIntersect.html" title="class in org.apache.calcite.rel.logical"><code>LogicalIntersect</code></a> to |
| empty if any of its children are empty.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#JOIN_LEFT_INSTANCE">JOIN_LEFT_INSTANCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Rule that converts a <a href="../core/Join.html" title="class in org.apache.calcite.rel.core"><code>Join</code></a> |
| to empty if its left child is empty.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#JOIN_RIGHT_INSTANCE">JOIN_RIGHT_INSTANCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Rule that converts a <a href="../core/Join.html" title="class in org.apache.calcite.rel.core"><code>Join</code></a> |
| to empty if its right child is empty.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#MINUS_INSTANCE">MINUS_INSTANCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Rule that removes empty children of a |
| <a href="../logical/LogicalMinus.html" title="class in org.apache.calcite.rel.logical"><code>LogicalMinus</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#PROJECT_INSTANCE">PROJECT_INSTANCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Rule that converts a <a href="../logical/LogicalProject.html" title="class in org.apache.calcite.rel.logical"><code>LogicalProject</code></a> |
| to empty if its child is empty.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#SORT_FETCH_ZERO_INSTANCE">SORT_FETCH_ZERO_INSTANCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Rule that converts a <a href="../core/Sort.html" title="class in org.apache.calcite.rel.core"><code>Sort</code></a> |
| to empty if it has <code>LIMIT 0</code>.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#SORT_INSTANCE">SORT_INSTANCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Rule that converts a <a href="../core/Sort.html" title="class in org.apache.calcite.rel.core"><code>Sort</code></a> |
| to empty if its child is empty.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#UNION_INSTANCE">UNION_INSTANCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Rule that removes empty children of a |
| <a href="../logical/LogicalUnion.html" title="class in org.apache.calcite.rel.logical"><code>LogicalUnion</code></a>.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </section> |
| </li> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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| </a> |
| <h2>Constructor Summary</h2> |
| <div class="memberSummary"> |
| <table> |
| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <thead> |
| <tr> |
| <th class="colFirst" scope="col">Constructor</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">PruneEmptyRules</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </section> |
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| <!-- --> |
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| <h2>Method Summary</h2> |
| <div class="inheritedList"> |
| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></h3> |
| <a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink">toString</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <li class="blockList"> |
| <section class="fieldDetails"><a id="field.detail"> |
| <!-- --> |
| </a> |
| <h2>Field Details</h2> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="UNION_INSTANCE">UNION_INSTANCE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="memberName">UNION_INSTANCE</span></div> |
| <div class="block">Rule that removes empty children of a |
| <a href="../logical/LogicalUnion.html" title="class in org.apache.calcite.rel.logical"><code>LogicalUnion</code></a>. |
| |
| <p>Examples: |
| |
| <ul> |
| <li>Union(Rel, Empty, Rel2) becomes Union(Rel, Rel2) |
| <li>Union(Rel, Empty, Empty) becomes Rel |
| <li>Union(Empty, Empty) becomes Empty |
| </ul></div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="MINUS_INSTANCE">MINUS_INSTANCE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="memberName">MINUS_INSTANCE</span></div> |
| <div class="block">Rule that removes empty children of a |
| <a href="../logical/LogicalMinus.html" title="class in org.apache.calcite.rel.logical"><code>LogicalMinus</code></a>. |
| |
| <p>Examples: |
| |
| <ul> |
| <li>Minus(Rel, Empty, Rel2) becomes Minus(Rel, Rel2) |
| <li>Minus(Empty, Rel) becomes Empty |
| </ul></div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="INTERSECT_INSTANCE">INTERSECT_INSTANCE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="memberName">INTERSECT_INSTANCE</span></div> |
| <div class="block">Rule that converts a |
| <a href="../logical/LogicalIntersect.html" title="class in org.apache.calcite.rel.logical"><code>LogicalIntersect</code></a> to |
| empty if any of its children are empty. |
| |
| <p>Examples: |
| |
| <ul> |
| <li>Intersect(Rel, Empty, Rel2) becomes Empty |
| <li>Intersect(Empty, Rel) becomes Empty |
| </ul></div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="PROJECT_INSTANCE">PROJECT_INSTANCE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="memberName">PROJECT_INSTANCE</span></div> |
| <div class="block">Rule that converts a <a href="../logical/LogicalProject.html" title="class in org.apache.calcite.rel.logical"><code>LogicalProject</code></a> |
| to empty if its child is empty. |
| |
| <p>Examples: |
| |
| <ul> |
| <li>Project(Empty) becomes Empty |
| </ul></div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="FILTER_INSTANCE">FILTER_INSTANCE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="memberName">FILTER_INSTANCE</span></div> |
| <div class="block">Rule that converts a <a href="../logical/LogicalFilter.html" title="class in org.apache.calcite.rel.logical"><code>LogicalFilter</code></a> |
| to empty if its child is empty. |
| |
| <p>Examples: |
| |
| <ul> |
| <li>Filter(Empty) becomes Empty |
| </ul></div> |
| </section> |
| </li> |
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| <h3><a id="SORT_INSTANCE">SORT_INSTANCE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="memberName">SORT_INSTANCE</span></div> |
| <div class="block">Rule that converts a <a href="../core/Sort.html" title="class in org.apache.calcite.rel.core"><code>Sort</code></a> |
| to empty if its child is empty. |
| |
| <p>Examples: |
| |
| <ul> |
| <li>Sort(Empty) becomes Empty |
| </ul></div> |
| </section> |
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| <h3><a id="SORT_FETCH_ZERO_INSTANCE">SORT_FETCH_ZERO_INSTANCE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="memberName">SORT_FETCH_ZERO_INSTANCE</span></div> |
| <div class="block">Rule that converts a <a href="../core/Sort.html" title="class in org.apache.calcite.rel.core"><code>Sort</code></a> |
| to empty if it has <code>LIMIT 0</code>. |
| |
| <p>Examples: |
| |
| <ul> |
| <li>Sort[fetch=0] becomes Empty |
| </ul></div> |
| </section> |
| </li> |
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| <h3><a id="AGGREGATE_INSTANCE">AGGREGATE_INSTANCE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="memberName">AGGREGATE_INSTANCE</span></div> |
| <div class="block">Rule that converts an <a href="../core/Aggregate.html" title="class in org.apache.calcite.rel.core"><code>Aggregate</code></a> |
| to empty if its child is empty. |
| |
| <p>Examples: |
| |
| <ul> |
| <li><code>Aggregate(key: [1, 3], Empty)</code> → <code>Empty</code> |
| |
| <li><code>Aggregate(key: [], Empty)</code> is unchanged, because an aggregate |
| without a GROUP BY key always returns 1 row, even over empty input |
| </ul></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="AggregateValuesRule.html" title="class in org.apache.calcite.rel.rules"><code>AggregateValuesRule</code></a></dd> |
| </dl> |
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| <h3><a id="JOIN_LEFT_INSTANCE">JOIN_LEFT_INSTANCE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="memberName">JOIN_LEFT_INSTANCE</span></div> |
| <div class="block">Rule that converts a <a href="../core/Join.html" title="class in org.apache.calcite.rel.core"><code>Join</code></a> |
| to empty if its left child is empty. |
| |
| <p>Examples: |
| |
| <ul> |
| <li>Join(Empty, Scan(Dept), INNER) becomes Empty |
| <li>Join(Empty, Scan(Dept), LEFT) becomes Empty |
| <li>Join(Empty, Scan(Dept), SEMI) becomes Empty |
| <li>Join(Empty, Scan(Dept), ANTI) becomes Empty |
| </ul></div> |
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| <h3><a id="JOIN_RIGHT_INSTANCE">JOIN_RIGHT_INSTANCE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="memberName">JOIN_RIGHT_INSTANCE</span></div> |
| <div class="block">Rule that converts a <a href="../core/Join.html" title="class in org.apache.calcite.rel.core"><code>Join</code></a> |
| to empty if its right child is empty. |
| |
| <p>Examples: |
| |
| <ul> |
| <li>Join(Scan(Emp), Empty, INNER) becomes Empty |
| <li>Join(Scan(Emp), Empty, RIGHT) becomes Empty |
| <li>Join(Scan(Emp), Empty, SEMI) becomes Empty |
| <li>Join(Scan(Emp), Empty, ANTI) becomes Scan(Emp) |
| </ul></div> |
| </section> |
| </li> |
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| <h3><a id="<init>()">PruneEmptyRules</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="memberName">PruneEmptyRules</span>()</div> |
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