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| <div class="sub-title"><span class="package-label-in-type">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="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance">org.apache.calcite.rel.rules.PruneEmptyRules</div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public abstract class </span><span class="element-name type-name-label">PruneEmptyRules</span> |
| <span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div> |
| <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 class="notes"> |
| <dt>See Also:</dt> |
| <dd> |
| <ul class="see-list-long"> |
| <li><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></li> |
| </ul> |
| </dd> |
| </dl> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ======== NESTED CLASS SUMMARY ======== --> |
| <li> |
| <section class="nested-class-summary" id="nested-class-summary"> |
| <h2>Nested Class Summary</h2> |
| <div class="caption"><span>Nested Classes</span></div> |
| <div class="summary-table three-column-summary"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Class</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color"><code>static interface </code></div> |
| <div class="col-second even-row-color"><code><a href="PruneEmptyRules.IntersectEmptyPruneRuleConfig.html" class="type-name-link" title="interface in org.apache.calcite.rel.rules">PruneEmptyRules.IntersectEmptyPruneRuleConfig</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Configuration for a rule that prunes an Intersect if any of its inputs |
| is empty.</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static interface </code></div> |
| <div class="col-second odd-row-color"><code><a href="PruneEmptyRules.JoinLeftEmptyRuleConfig.html" class="type-name-link" title="interface in org.apache.calcite.rel.rules">PruneEmptyRules.JoinLeftEmptyRuleConfig</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Configuration for rule that prunes a join it its left input is |
| empty.</div> |
| </div> |
| <div class="col-first even-row-color"><code>static interface </code></div> |
| <div class="col-second even-row-color"><code><a href="PruneEmptyRules.JoinRightEmptyRuleConfig.html" class="type-name-link" title="interface in org.apache.calcite.rel.rules">PruneEmptyRules.JoinRightEmptyRuleConfig</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Configuration for rule that prunes a join it its right input is |
| empty.</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static interface </code></div> |
| <div class="col-second odd-row-color"><code><a href="PruneEmptyRules.MinusEmptyPruneRuleConfig.html" class="type-name-link" title="interface in org.apache.calcite.rel.rules">PruneEmptyRules.MinusEmptyPruneRuleConfig</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Configuration for a rule that prunes empty inputs from a Minus.</div> |
| </div> |
| <div class="col-first even-row-color"><code>protected static class </code></div> |
| <div class="col-second even-row-color"><code><a href="PruneEmptyRules.PruneEmptyRule.html" class="type-name-link" title="class in org.apache.calcite.rel.rules">PruneEmptyRules.PruneEmptyRule</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Abstract prune empty rule that implements SubstitutionRule interface.</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static class </code></div> |
| <div class="col-second odd-row-color"><code><a href="PruneEmptyRules.RemoveEmptySingleRule.html" class="type-name-link" title="class in org.apache.calcite.rel.rules">PruneEmptyRules.RemoveEmptySingleRule</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Planner rule that converts a single-rel (e.g.</div> |
| </div> |
| <div class="col-first even-row-color"><code>static interface </code></div> |
| <div class="col-second even-row-color"><code><a href="PruneEmptyRules.SortFetchZeroRuleConfig.html" class="type-name-link" title="interface in org.apache.calcite.rel.rules">PruneEmptyRules.SortFetchZeroRuleConfig</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Configuration for a rule that prunes a Sort if it has limit 0.</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static interface </code></div> |
| <div class="col-second odd-row-color"><code><a href="PruneEmptyRules.UnionEmptyPruneRuleConfig.html" class="type-name-link" title="interface in org.apache.calcite.rel.rules">PruneEmptyRules.UnionEmptyPruneRuleConfig</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Configuration for a rule that prunes empty inputs from a Minus.</div> |
| </div> |
| <div class="col-first even-row-color"><code>static interface </code></div> |
| <div class="col-second even-row-color"><code><a href="PruneEmptyRules.ZeroMaxRowsRuleConfig.html" class="type-name-link" title="interface in org.apache.calcite.rel.rules">PruneEmptyRules.ZeroMaxRowsRuleConfig</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Configuration for rule that transforms an empty relational expression into an empty values.</div> |
| </div> |
| </div> |
| </section> |
| </li> |
| <!-- =========== FIELD SUMMARY =========== --> |
| <li> |
| <section class="field-summary" id="field-summary"> |
| <h2>Field Summary</h2> |
| <div class="caption"><span>Fields</span></div> |
| <div class="summary-table three-column-summary"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Field</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color"><code>static final <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></div> |
| <div class="col-second even-row-color"><code><a href="#AGGREGATE_INSTANCE" class="member-name-link">AGGREGATE_INSTANCE</a></code></div> |
| <div class="col-last even-row-color"> |
| <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> |
| </div> |
| <div class="col-first odd-row-color"><code>static final <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></div> |
| <div class="col-second odd-row-color"><code><a href="#EMPTY_TABLE_INSTANCE" class="member-name-link">EMPTY_TABLE_INSTANCE</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Rule that converts a <a href="../core/TableScan.html" title="class in org.apache.calcite.rel.core"><code>TableScan</code></a> |
| to empty if the table has no rows in it.</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></div> |
| <div class="col-second even-row-color"><code><a href="#FILTER_INSTANCE" class="member-name-link">FILTER_INSTANCE</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Rule that converts a <a href="../core/Filter.html" title="class in org.apache.calcite.rel.core"><code>Filter</code></a> |
| to empty if its child is empty.</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></div> |
| <div class="col-second odd-row-color"><code><a href="#INTERSECT_INSTANCE" class="member-name-link">INTERSECT_INSTANCE</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Rule that converts a |
| <a href="../core/Intersect.html" title="class in org.apache.calcite.rel.core"><code>Intersect</code></a> to |
| empty if any of its children are empty.</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></div> |
| <div class="col-second even-row-color"><code><a href="#JOIN_LEFT_INSTANCE" class="member-name-link">JOIN_LEFT_INSTANCE</a></code></div> |
| <div class="col-last even-row-color"> |
| <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> |
| </div> |
| <div class="col-first odd-row-color"><code>static final <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></div> |
| <div class="col-second odd-row-color"><code><a href="#JOIN_RIGHT_INSTANCE" class="member-name-link">JOIN_RIGHT_INSTANCE</a></code></div> |
| <div class="col-last odd-row-color"> |
| <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> |
| </div> |
| <div class="col-first even-row-color"><code>static final <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></div> |
| <div class="col-second even-row-color"><code><a href="#MINUS_INSTANCE" class="member-name-link">MINUS_INSTANCE</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Rule that removes empty children of a |
| <a href="../core/Minus.html" title="class in org.apache.calcite.rel.core"><code>Minus</code></a>.</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></div> |
| <div class="col-second odd-row-color"><code><a href="#PROJECT_INSTANCE" class="member-name-link">PROJECT_INSTANCE</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Rule that converts a <a href="../core/Project.html" title="class in org.apache.calcite.rel.core"><code>Project</code></a> |
| to empty if its child is empty.</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></div> |
| <div class="col-second even-row-color"><code><a href="#SORT_FETCH_ZERO_INSTANCE" class="member-name-link">SORT_FETCH_ZERO_INSTANCE</a></code></div> |
| <div class="col-last even-row-color"> |
| <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> |
| </div> |
| <div class="col-first odd-row-color"><code>static final <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></div> |
| <div class="col-second odd-row-color"><code><a href="#SORT_INSTANCE" class="member-name-link">SORT_INSTANCE</a></code></div> |
| <div class="col-last odd-row-color"> |
| <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> |
| </div> |
| <div class="col-first even-row-color"><code>static final <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></div> |
| <div class="col-second even-row-color"><code><a href="#UNION_INSTANCE" class="member-name-link">UNION_INSTANCE</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Rule that removes empty children of a |
| <a href="../core/Union.html" title="class in org.apache.calcite.rel.core"><code>Union</code></a>.</div> |
| </div> |
| </div> |
| </section> |
| </li> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <li> |
| <section class="constructor-summary" id="constructor-summary"> |
| <h2>Constructor Summary</h2> |
| <div class="caption"><span>Constructors</span></div> |
| <div class="summary-table two-column-summary"> |
| <div class="table-header col-first">Constructor</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">PruneEmptyRules</a>()</code></div> |
| <div class="col-last even-row-color"> </div> |
| </div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <li> |
| <section class="field-details" id="field-detail"> |
| <h2>Field Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="UNION_INSTANCE"> |
| <h3>UNION_INSTANCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="element-name">UNION_INSTANCE</span></div> |
| <div class="block">Rule that removes empty children of a |
| <a href="../core/Union.html" title="class in org.apache.calcite.rel.core"><code>Union</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> |
| <section class="detail" id="MINUS_INSTANCE"> |
| <h3>MINUS_INSTANCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="element-name">MINUS_INSTANCE</span></div> |
| <div class="block">Rule that removes empty children of a |
| <a href="../core/Minus.html" title="class in org.apache.calcite.rel.core"><code>Minus</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> |
| <section class="detail" id="INTERSECT_INSTANCE"> |
| <h3>INTERSECT_INSTANCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="element-name">INTERSECT_INSTANCE</span></div> |
| <div class="block">Rule that converts a |
| <a href="../core/Intersect.html" title="class in org.apache.calcite.rel.core"><code>Intersect</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> |
| <section class="detail" id="EMPTY_TABLE_INSTANCE"> |
| <h3>EMPTY_TABLE_INSTANCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="element-name">EMPTY_TABLE_INSTANCE</span></div> |
| <div class="block">Rule that converts a <a href="../core/TableScan.html" title="class in org.apache.calcite.rel.core"><code>TableScan</code></a> |
| to empty if the table has no rows in it. |
| |
| The rule exploits the <a href="../metadata/RelMdMaxRowCount.html" title="class in org.apache.calcite.rel.metadata"><code>RelMdMaxRowCount</code></a> to derive if |
| the table is empty or not.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="PROJECT_INSTANCE"> |
| <h3>PROJECT_INSTANCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="element-name">PROJECT_INSTANCE</span></div> |
| <div class="block">Rule that converts a <a href="../core/Project.html" title="class in org.apache.calcite.rel.core"><code>Project</code></a> |
| to empty if its child is empty. |
| |
| <p>Examples: |
| |
| <ul> |
| <li>Project(Empty) becomes Empty |
| </ul></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="FILTER_INSTANCE"> |
| <h3>FILTER_INSTANCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="element-name">FILTER_INSTANCE</span></div> |
| <div class="block">Rule that converts a <a href="../core/Filter.html" title="class in org.apache.calcite.rel.core"><code>Filter</code></a> |
| to empty if its child is empty. |
| |
| <p>Examples: |
| |
| <ul> |
| <li>Filter(Empty) becomes Empty |
| </ul></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="SORT_INSTANCE"> |
| <h3>SORT_INSTANCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="element-name">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> |
| </li> |
| <li> |
| <section class="detail" id="SORT_FETCH_ZERO_INSTANCE"> |
| <h3>SORT_FETCH_ZERO_INSTANCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="element-name">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> |
| <li> |
| <section class="detail" id="AGGREGATE_INSTANCE"> |
| <h3>AGGREGATE_INSTANCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="element-name">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 class="notes"> |
| <dt>See Also:</dt> |
| <dd> |
| <ul class="see-list"> |
| <li><a href="AggregateValuesRule.html" title="class in org.apache.calcite.rel.rules"><code>AggregateValuesRule</code></a></li> |
| </ul> |
| </dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="JOIN_LEFT_INSTANCE"> |
| <h3>JOIN_LEFT_INSTANCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="element-name">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> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="JOIN_RIGHT_INSTANCE"> |
| <h3>JOIN_RIGHT_INSTANCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></span> <span class="element-name">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> |
| </ul> |
| </section> |
| </li> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <li> |
| <section class="constructor-details" id="constructor-detail"> |
| <h2>Constructor Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="<init>()"> |
| <h3>PruneEmptyRules</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="element-name">PruneEmptyRules</span>()</div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <!-- ========= END OF CLASS DATA ========= --> |
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| <hr> |
| <p class="legal-copy"><small>Copyright © 2012-2023 Apache Software Foundation. All Rights Reserved.</small></p> |
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