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/*
* 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.index;
import java.util.Collection;
import java.util.List;
import java.util.Set;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import org.apache.calcite.plan.RelOptCost;
import org.apache.calcite.plan.RelOptPlanner;
import org.apache.calcite.rel.RelFieldCollation.NullDirection;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.exec.expr.CloneVisitor;
import org.apache.drill.exec.physical.base.DbGroupScan;
import org.apache.drill.exec.physical.base.GroupScan;
import org.apache.drill.exec.planner.cost.DrillCostBase;
import org.apache.drill.exec.planner.cost.DrillCostBase.DrillCostFactory;
import org.apache.drill.exec.planner.cost.PluginCost;
import org.apache.drill.exec.planner.index.IndexProperties;
import org.apache.drill.exec.store.mapr.PluginConstants;
import org.apache.drill.exec.util.EncodedSchemaPathSet;
import org.apache.drill.common.expression.LogicalExpression;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableSet;
public class MapRDBIndexDescriptor extends DrillIndexDescriptor {
protected final Object desc;
protected final Set<LogicalExpression> allFields;
protected final Set<LogicalExpression> indexedFields;
protected MapRDBFunctionalIndexInfo functionalInfo;
protected PluginCost pluginCost;
public MapRDBIndexDescriptor(List<LogicalExpression> indexCols,
CollationContext indexCollationContext,
List<LogicalExpression> nonIndexCols,
List<LogicalExpression> rowKeyColumns,
String indexName,
String tableName,
IndexType type,
Object desc,
DbGroupScan scan,
NullDirection nullsDirection) {
super(indexCols, indexCollationContext, nonIndexCols, rowKeyColumns, indexName, tableName, type, nullsDirection);
this.desc = desc;
this.indexedFields = ImmutableSet.copyOf(indexColumns);
this.allFields = new ImmutableSet.Builder<LogicalExpression>()
.add(PluginConstants.DOCUMENT_SCHEMA_PATH)
.addAll(indexColumns)
.addAll(nonIndexColumns)
.build();
this.pluginCost = scan.getPluginCostModel();
}
public Object getOriginalDesc(){
return desc;
}
@Override
public boolean isCoveringIndex(List<LogicalExpression> expressions) {
List<LogicalExpression> decodedCols = new DecodePathinExpr().parseExpressions(expressions);
return columnsInIndexFields(decodedCols, allFields);
}
@Override
public boolean allColumnsIndexed(Collection<LogicalExpression> expressions) {
List<LogicalExpression> decodedCols = new DecodePathinExpr().parseExpressions(expressions);
return columnsInIndexFields(decodedCols, indexedFields);
}
@Override
public boolean someColumnsIndexed(Collection<LogicalExpression> columns) {
return columnsIndexed(columns, false);
}
private boolean columnsIndexed(Collection<LogicalExpression> expressions, boolean allColsIndexed) {
List<LogicalExpression> decodedCols = new DecodePathinExpr().parseExpressions(expressions);
if (allColsIndexed) {
return columnsInIndexFields(decodedCols, indexedFields);
} else {
return someColumnsInIndexFields(decodedCols, indexedFields);
}
}
public FunctionalIndexInfo getFunctionalInfo() {
if (this.functionalInfo == null) {
this.functionalInfo = new MapRDBFunctionalIndexInfo(this);
}
return this.functionalInfo;
}
/**
* Search through a LogicalExpression, finding all referenced schema paths
* and replace them with decoded paths.
* If one encoded path could be decoded to multiple paths, add these decoded paths to
* the end of returned list of expressions from parseExpressions.
*/
private class DecodePathinExpr extends CloneVisitor {
Set<SchemaPath> schemaPathSet = Sets.newHashSet();
public List<LogicalExpression> parseExpressions(Collection<LogicalExpression> expressions) {
List<LogicalExpression> allCols = Lists.newArrayList();
Collection<SchemaPath> decoded;
for (LogicalExpression expr : expressions) {
LogicalExpression nonDecoded = expr.accept(this, null);
if (nonDecoded != null) {
allCols.add(nonDecoded);
}
}
if (schemaPathSet.size() > 0) {
decoded = EncodedSchemaPathSet.decode(schemaPathSet);
allCols.addAll(decoded);
}
return allCols;
}
@Override
public LogicalExpression visitSchemaPath(SchemaPath path, Void value) {
if (EncodedSchemaPathSet.isEncodedSchemaPath(path)) {
// if decoded size is not one, incoming path is encoded path thus there is no cast or other function applied on it,
// since users won't pass in encoded fields, so it is safe to return null,
schemaPathSet.add(path);
return null;
} else {
return path;
}
}
}
@Override
public RelOptCost getCost(IndexProperties indexProps, RelOptPlanner planner,
int numProjectedFields, GroupScan primaryTableGroupScan) {
Preconditions.checkArgument(primaryTableGroupScan instanceof DbGroupScan);
DbGroupScan dbGroupScan = (DbGroupScan) primaryTableGroupScan;
DrillCostFactory costFactory = (DrillCostFactory)planner.getCostFactory();
double totalRows = indexProps.getTotalRows();
double leadRowCount = indexProps.getLeadingSelectivity() * totalRows;
double avgRowSize = indexProps.getAvgRowSize();
if (indexProps.isCovering()) { // covering index
// int numIndexCols = allFields.size();
// for disk i/o, all index columns are going to be read into memory
double numBlocks = Math.ceil((leadRowCount * avgRowSize)/pluginCost.getBlockSize(primaryTableGroupScan));
double diskCost = numBlocks * pluginCost.getSequentialBlockReadCost(primaryTableGroupScan);
// cpu cost is cost of filter evaluation for the remainder condition
double cpuCost = 0.0;
if (indexProps.getTotalRemainderFilter() != null) {
cpuCost = leadRowCount * DrillCostBase.COMPARE_CPU_COST;
}
double networkCost = 0.0; // TODO: add network cost once full table scan also considers network cost
return costFactory.makeCost(leadRowCount, cpuCost, diskCost, networkCost);
} else { // non-covering index
// int numIndexCols = allFields.size();
double numBlocksIndex = Math.ceil((leadRowCount * avgRowSize)/pluginCost.getBlockSize(primaryTableGroupScan));
double diskCostIndex = numBlocksIndex * pluginCost.getSequentialBlockReadCost(primaryTableGroupScan);
// for the primary table join-back each row may belong to a different block, so in general num_blocks = num_rows;
// however, num_blocks cannot exceed the total number of blocks of the table
double totalBlocksPrimary = Math.ceil((dbGroupScan.getColumns().size() *
pluginCost.getAverageColumnSize(primaryTableGroupScan) * totalRows)/
pluginCost.getBlockSize(primaryTableGroupScan));
double diskBlocksPrimary = Math.min(totalBlocksPrimary, leadRowCount);
double diskCostPrimary = diskBlocksPrimary * pluginCost.getRandomBlockReadCost(primaryTableGroupScan);
double diskCostTotal = diskCostIndex + diskCostPrimary;
// cpu cost of remainder condition evaluation over the selected rows
double cpuCost = 0.0;
if (indexProps.getTotalRemainderFilter() != null) {
cpuCost = leadRowCount * DrillCostBase.COMPARE_CPU_COST;
}
double networkCost = 0.0; // TODO: add network cost once full table scan also considers network cost
return costFactory.makeCost(leadRowCount, cpuCost, diskCostTotal, networkCost);
}
}
// Future use once full table scan also includes network cost
private double getNetworkCost(double leadRowCount, int numProjectedFields, boolean isCovering,
GroupScan primaryTableGroupScan) {
if (isCovering) {
// db server will send only the projected columns to the db client for the selected
// number of rows, so network cost is based on the number of actual projected columns
double networkCost = leadRowCount * numProjectedFields * pluginCost.getAverageColumnSize(primaryTableGroupScan);
return networkCost;
} else {
// only the rowkey column is projected from the index and sent over the network
double networkCostIndex = leadRowCount * 1 * pluginCost.getAverageColumnSize(primaryTableGroupScan);
// after join-back to primary table, all projected columns are sent over the network
double networkCostPrimary = leadRowCount * numProjectedFields * pluginCost.getAverageColumnSize(primaryTableGroupScan);
return networkCostIndex + networkCostPrimary;
}
}
@Override
public PluginCost getPluginCostModel() {
return pluginCost;
}
}
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