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https://issues.apache.org/jira/browse/DRILL-6381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16619858#comment-16619858
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ASF GitHub Bot commented on DRILL-6381:
---------------------------------------
gparai commented on a change in pull request #1466: DRILL-6381: Add support for
index based planning and execution
URL: https://github.com/apache/drill/pull/1466#discussion_r218616620
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/RowKeyJoinPrel.java
##########
@@ -0,0 +1,117 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.drill.exec.planner.physical;
+
+import java.io.IOException;
+import java.util.Iterator;
+
+import org.apache.drill.exec.physical.base.PhysicalOperator;
+import org.apache.drill.exec.physical.config.RowKeyJoinPOP;
+import org.apache.drill.exec.planner.cost.DrillCostBase.DrillCostFactory;
+import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;
+import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
+import org.apache.calcite.rel.InvalidRelException;
+import org.apache.calcite.rel.RelNode;
+import org.apache.calcite.rel.core.Join;
+import org.apache.calcite.rel.core.JoinRelType;
+import org.apache.calcite.rel.metadata.RelMetadataQuery;
+import org.apache.calcite.rex.RexNode;
+import org.apache.calcite.plan.RelOptCluster;
+import org.apache.calcite.plan.RelOptCost;
+import org.apache.calcite.plan.RelOptPlanner;
+import org.apache.calcite.plan.RelTraitSet;
+
+import org.apache.drill.shaded.guava.com.google.common.base.Preconditions;
+
+public class RowKeyJoinPrel extends JoinPrel implements Prel {
+
+ double estimatedRowCount = -1;
+ public RowKeyJoinPrel(RelOptCluster cluster, RelTraitSet traits, RelNode
left, RelNode right,
+ RexNode condition, JoinRelType joinType) throws InvalidRelException {
+ super(cluster, traits, left, right, condition, joinType);
+ Preconditions.checkArgument(joinType == JoinRelType.INNER);
+ }
+
+ @Override
+ public PhysicalOperator getPhysicalOperator(PhysicalPlanCreator creator)
throws IOException {
+ PhysicalOperator leftPop = ((Prel)left).getPhysicalOperator(creator);
+ PhysicalOperator rightPop = ((Prel)right).getPhysicalOperator(creator);
+ RowKeyJoinPOP rkPop = new RowKeyJoinPOP(leftPop, rightPop);
+ return creator.addMetadata(this, rkPop);
+ }
+
+ @Override
+ public double estimateRowCount(RelMetadataQuery mq) {
+ if (estimatedRowCount >= 0) {
+ return estimatedRowCount;
+ }
+ return this.getLeft().getRows();
+ }
+
+ @Override
+ public Join copy(RelTraitSet traitSet, RexNode conditionExpr, RelNode left,
RelNode right,
+ JoinRelType joinType, boolean semiJoinDone) {
+ try {
+ RowKeyJoinPrel rkj = new RowKeyJoinPrel(this.getCluster(), traitSet,
left, right, conditionExpr, joinType);
+ rkj.setEstimatedRowCount(this.estimatedRowCount);
+ return rkj;
+ } catch (InvalidRelException e) {
+ throw new AssertionError(e);
+ }
+ }
+
+ @Override
+ public RelOptCost computeSelfCost(RelOptPlanner planner, RelMetadataQuery
mq) {
+ if(PrelUtil.getSettings(getCluster()).useDefaultCosting()) {
+ return super.computeSelfCost(planner).multiplyBy(.1);
+ }
+ double rowCount = mq.getRowCount(this.getRight());
+ DrillCostFactory costFactory = (DrillCostFactory) planner.getCostFactory();
+ return costFactory.makeCost(rowCount, 0, 0, 0,
Review comment:
Everything is 0 cost-wise? Maybe add an explanation.
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> Add capability to do index based planning and execution
> -------------------------------------------------------
>
> Key: DRILL-6381
> URL: https://issues.apache.org/jira/browse/DRILL-6381
> Project: Apache Drill
> Issue Type: New Feature
> Components: Execution - Relational Operators, Query Planning &
> Optimization
> Reporter: Aman Sinha
> Assignee: Aman Sinha
> Priority: Major
> Fix For: 1.15.0
>
>
> If the underlying data source supports indexes (primary and secondary
> indexes), Drill should leverage those during planning and execution in order
> to improve query performance.
> On the planning side, Drill planner should be enhanced to provide an
> abstraction layer which express the index metadata and statistics. Further,
> a cost-based index selection is needed to decide which index(es) are
> suitable.
> On the execution side, appropriate operator enhancements would be needed to
> handle different categories of indexes such as covering, non-covering
> indexes, taking into consideration the index data may not be co-located with
> the primary table, i.e a global index.
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