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| <h2 title="Class LoptSemiJoinOptimizer" class="title">Class LoptSemiJoinOptimizer</h2> |
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| <li>org.apache.calcite.rel.rules.LoptSemiJoinOptimizer</li> |
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| <pre>public class <span class="typeNameLabel">LoptSemiJoinOptimizer</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Implements the logic for determining the optimal |
| semi-joins to be used in processing joins in a query.</div> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/LoptSemiJoinOptimizer.html#LoptSemiJoinOptimizer-org.apache.calcite.rel.metadata.RelMetadataQuery-org.apache.calcite.rel.rules.LoptMultiJoin-org.apache.calcite.rex.RexBuilder-">LoptSemiJoinOptimizer</a></span>(<a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQuery.html" title="class in org.apache.calcite.rel.metadata">RelMetadataQuery</a> mq, |
| <a href="../../../../../org/apache/calcite/rel/rules/LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin, |
| <a href="../../../../../org/apache/calcite/rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a> rexBuilder)</code> </td> |
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| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/LoptSemiJoinOptimizer.html#chooseBestSemiJoin-org.apache.calcite.rel.rules.LoptMultiJoin-">chooseBestSemiJoin</a></span>(<a href="../../../../../org/apache/calcite/rel/rules/LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin)</code> |
| <div class="block">Finds the optimal semijoin for filtering the least costly fact table from |
| among the remaining possible semijoins to choose from.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><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/LoptSemiJoinOptimizer.html#getChosenSemiJoin-int-">getChosenSemiJoin</a></span>(int factIdx)</code> </td> |
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| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/LoptSemiJoinOptimizer.html#makePossibleSemiJoins-org.apache.calcite.rel.rules.LoptMultiJoin-">makePossibleSemiJoins</a></span>(<a href="../../../../../org/apache/calcite/rel/rules/LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin)</code> |
| <div class="block">Determines all possible semijoins that can be used by dimension tables to |
| filter fact tables.</div> |
| </td> |
| </tr> |
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| <h3>Constructor Detail</h3> |
| <a name="LoptSemiJoinOptimizer-org.apache.calcite.rel.metadata.RelMetadataQuery-org.apache.calcite.rel.rules.LoptMultiJoin-org.apache.calcite.rex.RexBuilder-"> |
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| <h4>LoptSemiJoinOptimizer</h4> |
| <pre>public LoptSemiJoinOptimizer(<a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQuery.html" title="class in org.apache.calcite.rel.metadata">RelMetadataQuery</a> mq, |
| <a href="../../../../../org/apache/calcite/rel/rules/LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin, |
| <a href="../../../../../org/apache/calcite/rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a> rexBuilder)</pre> |
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| <a name="makePossibleSemiJoins-org.apache.calcite.rel.rules.LoptMultiJoin-"> |
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| <h4>makePossibleSemiJoins</h4> |
| <pre>public void makePossibleSemiJoins(<a href="../../../../../org/apache/calcite/rel/rules/LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin)</pre> |
| <div class="block">Determines all possible semijoins that can be used by dimension tables to |
| filter fact tables. Constructs SemiJoinRels corresponding to potential |
| dimension table filters and stores them in the member field |
| "possibleSemiJoins"</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>multiJoin</code> - join factors being optimized</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>chooseBestSemiJoin</h4> |
| <pre>public boolean chooseBestSemiJoin(<a href="../../../../../org/apache/calcite/rel/rules/LoptMultiJoin.html" title="class in org.apache.calcite.rel.rules">LoptMultiJoin</a> multiJoin)</pre> |
| <div class="block">Finds the optimal semijoin for filtering the least costly fact table from |
| among the remaining possible semijoins to choose from. The chosen |
| semijoin is stored in the chosenSemiJoins array</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>multiJoin</code> - join factors being optimized</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if a suitable semijoin is found; false otherwise</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getChosenSemiJoin-int-"> |
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| </a> |
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| <h4>getChosenSemiJoin</h4> |
| <pre>public <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> getChosenSemiJoin(int factIdx)</pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>factIdx</code> - index corresponding to the desired factor</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>optimal semijoin for the specified factor; may be the factor |
| itself if semijoins are not chosen for the factor</dd> |
| </dl> |
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