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| <div class="subTitle">org.apache.drill.exec.planner.cost</div> |
| <h2 title="Class DrillRelMdDistinctRowCount" class="title">Class DrillRelMdDistinctRowCount</h2> |
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| <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>org.apache.calcite.rel.metadata.RelMdDistinctRowCount</li> |
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| <ul class="inheritance"> |
| <li>org.apache.drill.exec.planner.cost.DrillRelMdDistinctRowCount</li> |
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| <dd>org.apache.calcite.rel.metadata.MetadataHandler<org.apache.calcite.rel.metadata.BuiltInMetadata.DistinctRowCount></dd> |
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| <pre>public class <span class="typeNameLabel">DrillRelMdDistinctRowCount</span> |
| extends org.apache.calcite.rel.metadata.RelMdDistinctRowCount</pre> |
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| <td class="colFirst"><code>static org.apache.calcite.rel.metadata.RelMetadataProvider</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/cost/DrillRelMdDistinctRowCount.html#SOURCE">SOURCE</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/cost/DrillRelMdDistinctRowCount.html#DrillRelMdDistinctRowCount--">DrillRelMdDistinctRowCount</a></span>()</code> </td> |
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| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/cost/DrillRelMdDistinctRowCount.html#getDistinctRowCount-org.apache.calcite.rel.core.Join-org.apache.calcite.rel.metadata.RelMetadataQuery-org.apache.calcite.util.ImmutableBitSet-org.apache.calcite.rex.RexNode-">getDistinctRowCount</a></span>(org.apache.calcite.rel.core.Join rel, |
| org.apache.calcite.rel.metadata.RelMetadataQuery mq, |
| org.apache.calcite.util.ImmutableBitSet groupKey, |
| org.apache.calcite.rex.RexNode predicate)</code> |
| <div class="block">We need to override this method since Calcite and Drill calculate |
| joined row count in different ways.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/cost/DrillRelMdDistinctRowCount.html#getDistinctRowCount-org.apache.calcite.rel.RelNode-org.apache.calcite.rel.metadata.RelMetadataQuery-org.apache.calcite.util.ImmutableBitSet-org.apache.calcite.rex.RexNode-">getDistinctRowCount</a></span>(org.apache.calcite.rel.RelNode rel, |
| org.apache.calcite.rel.metadata.RelMetadataQuery mq, |
| org.apache.calcite.util.ImmutableBitSet groupKey, |
| org.apache.calcite.rex.RexNode predicate)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/cost/DrillRelMdDistinctRowCount.html#getDistinctRowCount-org.apache.calcite.plan.volcano.RelSubset-org.apache.calcite.rel.metadata.RelMetadataQuery-org.apache.calcite.util.ImmutableBitSet-org.apache.calcite.rex.RexNode-">getDistinctRowCount</a></span>(org.apache.calcite.plan.volcano.RelSubset rel, |
| org.apache.calcite.rel.metadata.RelMetadataQuery mq, |
| org.apache.calcite.util.ImmutableBitSet groupKey, |
| org.apache.calcite.rex.RexNode predicate)</code> </td> |
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| <h3>Methods inherited from class org.apache.calcite.rel.metadata.RelMdDistinctRowCount</h3> |
| <code>getDef, getDistinctRowCount, getDistinctRowCount, getDistinctRowCount, getDistinctRowCount, getDistinctRowCount, getDistinctRowCount, getDistinctRowCount</code></li> |
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| <pre>public static final org.apache.calcite.rel.metadata.RelMetadataProvider SOURCE</pre> |
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| <h4>DrillRelMdDistinctRowCount</h4> |
| <pre>public DrillRelMdDistinctRowCount()</pre> |
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| <h4>getDistinctRowCount</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a> getDistinctRowCount(org.apache.calcite.rel.core.Join rel, |
| org.apache.calcite.rel.metadata.RelMetadataQuery mq, |
| org.apache.calcite.util.ImmutableBitSet groupKey, |
| org.apache.calcite.rex.RexNode predicate)</pre> |
| <div class="block">We need to override this method since Calcite and Drill calculate |
| joined row count in different ways. It helps avoid a case when |
| at the first time was used Drill join row count but at the second time |
| Calcite row count was used. It may happen when |
| <code>RelMdDistinctRowCount.getDistinctRowCount(Join, RelMetadataQuery, |
| ImmutableBitSet, RexNode)</code> method is used and after that used |
| another getDistinctRowCount method for parent rel, which just uses |
| row count of input rel node (our join rel). |
| It causes cost increase of best rel node when |
| <code>RelSubset.propagateCostImprovements(org.apache.calcite.plan.volcano.VolcanoPlanner, org.apache.calcite.rel.metadata.RelMetadataQuery, org.apache.calcite.rel.RelNode, java.util.Set<org.apache.calcite.plan.volcano.RelSubset>)</code> is called. |
| |
| This is a part of the fix for CALCITE-2018.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code>getDistinctRowCount</code> in class <code>org.apache.calcite.rel.metadata.RelMdDistinctRowCount</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getDistinctRowCount-org.apache.calcite.rel.RelNode-org.apache.calcite.rel.metadata.RelMetadataQuery-org.apache.calcite.util.ImmutableBitSet-org.apache.calcite.rex.RexNode-"> |
| <!-- --> |
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| <h4>getDistinctRowCount</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a> getDistinctRowCount(org.apache.calcite.rel.RelNode rel, |
| org.apache.calcite.rel.metadata.RelMetadataQuery mq, |
| org.apache.calcite.util.ImmutableBitSet groupKey, |
| org.apache.calcite.rex.RexNode predicate)</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code>getDistinctRowCount</code> in class <code>org.apache.calcite.rel.metadata.RelMdDistinctRowCount</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getDistinctRowCount-org.apache.calcite.plan.volcano.RelSubset-org.apache.calcite.rel.metadata.RelMetadataQuery-org.apache.calcite.util.ImmutableBitSet-org.apache.calcite.rex.RexNode-"> |
| <!-- --> |
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| <h4>getDistinctRowCount</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a> getDistinctRowCount(org.apache.calcite.plan.volcano.RelSubset rel, |
| org.apache.calcite.rel.metadata.RelMetadataQuery mq, |
| org.apache.calcite.util.ImmutableBitSet groupKey, |
| org.apache.calcite.rex.RexNode predicate)</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code>getDistinctRowCount</code> in class <code>org.apache.calcite.rel.metadata.RelMdDistinctRowCount</code></dd> |
| </dl> |
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