| /* |
| * 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.logical; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.calcite.rel.RelWriter; |
| import org.apache.calcite.rel.metadata.RelMetadataQuery; |
| import org.apache.drill.common.JSONOptions; |
| import org.apache.drill.common.expression.SchemaPath; |
| import org.apache.drill.common.logical.data.LogicalOperator; |
| import org.apache.drill.common.logical.data.Scan; |
| import org.apache.drill.exec.physical.base.GroupScan; |
| import org.apache.drill.exec.physical.base.ScanStats; |
| import org.apache.drill.exec.planner.common.DrillScanRelBase; |
| import org.apache.drill.exec.planner.cost.DrillCostBase.DrillCostFactory; |
| import org.apache.drill.exec.planner.physical.PlannerSettings; |
| import org.apache.drill.exec.planner.physical.PrelUtil; |
| import org.apache.drill.exec.planner.torel.ConversionContext; |
| import org.apache.calcite.plan.RelOptCluster; |
| import org.apache.calcite.plan.RelOptCost; |
| import org.apache.calcite.plan.RelOptPlanner; |
| import org.apache.calcite.plan.RelOptTable; |
| import org.apache.calcite.plan.RelTraitSet; |
| import org.apache.calcite.rel.type.RelDataType; |
| |
| import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; |
| import org.apache.drill.exec.util.Utilities; |
| |
| /** |
| * GroupScan of a Drill table. |
| */ |
| public class DrillScanRel extends DrillScanRelBase implements DrillRel { |
| private final static int STAR_COLUMN_COST = 10000; |
| private PlannerSettings settings; |
| private List<SchemaPath> columns; |
| private final boolean partitionFilterPushdown; |
| final private RelDataType rowType; |
| |
| /** Creates a DrillScan. */ |
| public DrillScanRel(final RelOptCluster cluster, final RelTraitSet traits, |
| final RelOptTable table) { |
| this(cluster, traits, table, false); |
| } |
| /** Creates a DrillScan. */ |
| public DrillScanRel(final RelOptCluster cluster, final RelTraitSet traits, |
| final RelOptTable table, boolean partitionFilterPushdown) { |
| // By default, scan does not support project pushdown. |
| // Decision whether push projects into scan will be made solely in DrillPushProjIntoScanRule. |
| this(cluster, traits, table, table.getRowType(), getProjectedColumns(table, true), partitionFilterPushdown); |
| this.settings = PrelUtil.getPlannerSettings(cluster.getPlanner()); |
| } |
| |
| /** Creates a DrillScan. */ |
| public DrillScanRel(final RelOptCluster cluster, final RelTraitSet traits, |
| final RelOptTable table, final RelDataType rowType, final List<SchemaPath> columns) { |
| this(cluster, traits, table, rowType, columns, false); |
| } |
| |
| /** Creates a DrillScan. */ |
| public DrillScanRel(final RelOptCluster cluster, final RelTraitSet traits, |
| final RelOptTable table, final RelDataType rowType, final List<SchemaPath> columns, boolean partitionFilterPushdown) { |
| super(cluster, traits, table, columns); |
| this.settings = PrelUtil.getPlannerSettings(cluster.getPlanner()); |
| this.rowType = rowType; |
| Preconditions.checkNotNull(columns); |
| this.columns = columns; |
| this.partitionFilterPushdown = partitionFilterPushdown; |
| } |
| |
| /** Creates a DrillScanRel for a particular GroupScan */ |
| public DrillScanRel(final RelOptCluster cluster, final RelTraitSet traits, |
| final RelOptTable table, final GroupScan groupScan, final RelDataType rowType, final List<SchemaPath> columns) { |
| this(cluster, traits, table, groupScan, rowType, columns, false); |
| } |
| |
| /** Creates a DrillScanRel for a particular GroupScan */ |
| public DrillScanRel(final RelOptCluster cluster, final RelTraitSet traits, |
| final RelOptTable table, final GroupScan groupScan, final RelDataType rowType, final List<SchemaPath> columns, boolean partitionFilterPushdown) { |
| super(cluster, traits, groupScan, table); |
| this.rowType = rowType; |
| this.columns = columns; |
| this.settings = PrelUtil.getPlannerSettings(cluster.getPlanner()); |
| this.partitionFilterPushdown = partitionFilterPushdown; |
| } |
| |
| // |
| // private static GroupScan getCopy(GroupScan scan){ |
| // try { |
| // return (GroupScan) scan.getNewWithChildren((List<PhysicalOperator>) (Object) Collections.emptyList()); |
| // } catch (ExecutionSetupException e) { |
| // throw new DrillRuntimeException("Unexpected failure while coping node.", e); |
| // } |
| // } |
| |
| public List<SchemaPath> getColumns() { |
| return this.columns; |
| } |
| |
| @Override |
| public LogicalOperator implement(DrillImplementor implementor) { |
| Scan.Builder builder = Scan.builder(); |
| builder.storageEngine(drillTable.getStorageEngineName()); |
| builder.selection(new JSONOptions(drillTable.getSelection())); |
| implementor.registerSource(drillTable); |
| return builder.build(); |
| } |
| |
| public static DrillScanRel convert(Scan scan, ConversionContext context) { |
| return new DrillScanRel(context.getCluster(), context.getLogicalTraits(), |
| context.getTable(scan)); |
| } |
| |
| @Override |
| public RelDataType deriveRowType() { |
| return this.rowType; |
| } |
| |
| @Override |
| public RelWriter explainTerms(RelWriter pw) { |
| return super.explainTerms(pw).item("groupscan", getGroupScan().getDigest()); |
| } |
| |
| @Override |
| public double estimateRowCount(RelMetadataQuery mq) { |
| return getGroupScan().getScanStats(settings).getRecordCount(); |
| } |
| |
| /// TODO: this method is same as the one for ScanPrel...eventually we should consolidate |
| /// this and few other methods in a common base class which would be extended |
| /// by both logical and physical rels. |
| @Override |
| public RelOptCost computeSelfCost(final RelOptPlanner planner, RelMetadataQuery mq) { |
| final ScanStats stats = getGroupScan().getScanStats(settings); |
| int columnCount = getRowType().getFieldCount(); |
| double ioCost = 0; |
| boolean isStarQuery = Utilities.isStarQuery(columns); |
| |
| if (isStarQuery) { |
| columnCount = STAR_COLUMN_COST; |
| } |
| |
| // double rowCount = RelMetadataQuery.getRowCount(this); |
| double rowCount = stats.getRecordCount(); |
| if (rowCount < 1) { |
| rowCount = 1; |
| } |
| |
| if(PrelUtil.getSettings(getCluster()).useDefaultCosting()) { |
| return planner.getCostFactory().makeCost(rowCount * columnCount, stats.getCpuCost(), stats.getDiskCost()); |
| } |
| |
| double cpuCost = rowCount * columnCount; // for now, assume cpu cost is proportional to row count and number of columns |
| |
| DrillCostFactory costFactory = (DrillCostFactory)planner.getCostFactory(); |
| return costFactory.makeCost(rowCount, cpuCost, ioCost, 0); |
| } |
| |
| public boolean partitionFilterPushdown() { |
| return this.partitionFilterPushdown; |
| } |
| |
| private static List<SchemaPath> getProjectedColumns(final RelOptTable table, boolean isSelectStar) { |
| List<String> columnNames = table.getRowType().getFieldNames(); |
| List<SchemaPath> projectedColumns = new ArrayList<SchemaPath>(columnNames.size()); |
| |
| for (String columnName : columnNames) { |
| projectedColumns.add(SchemaPath.getSimplePath(columnName)); |
| } |
| |
| // If the row-type doesn't contain the STAR keyword, then insert it |
| // as we are dealing with a SELECT_STAR query. |
| if (isSelectStar && !Utilities.isStarQuery(projectedColumns)) { |
| projectedColumns.add(SchemaPath.STAR_COLUMN); |
| } |
| |
| return projectedColumns; |
| } |
| |
| } |