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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.druid.sql.calcite.rule;
import org.apache.calcite.rel.core.AggregateCall;
import org.apache.calcite.rel.core.Project;
import org.apache.calcite.rex.RexBuilder;
import org.apache.calcite.rex.RexNode;
import org.apache.druid.query.aggregation.AggregatorFactory;
import org.apache.druid.query.aggregation.FilteredAggregatorFactory;
import org.apache.druid.query.filter.DimFilter;
import org.apache.druid.sql.calcite.aggregation.Aggregation;
import org.apache.druid.sql.calcite.aggregation.SqlAggregator;
import org.apache.druid.sql.calcite.expression.Expressions;
import org.apache.druid.sql.calcite.filtration.Filtration;
import org.apache.druid.sql.calcite.planner.PlannerContext;
import org.apache.druid.sql.calcite.rel.VirtualColumnRegistry;
import org.apache.druid.sql.calcite.table.RowSignature;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
public class GroupByRules
{
private GroupByRules()
{
// No instantiation.
}
/**
* Translate an AggregateCall to Druid equivalents.
*
* @return translated aggregation, or null if translation failed.
*/
public static Aggregation translateAggregateCall(
final PlannerContext plannerContext,
final RowSignature rowSignature,
final VirtualColumnRegistry virtualColumnRegistry,
final RexBuilder rexBuilder,
final Project project,
final List existingAggregations,
final String name,
final AggregateCall call,
final boolean finalizeAggregations
)
{
final DimFilter filter;
if (call.filterArg >= 0) {
// AGG(xxx) FILTER(WHERE yyy)
if (project == null) {
// We need some kind of projection to support filtered aggregations.
return null;
}
final RexNode expression = project.getChildExps().get(call.filterArg);
final DimFilter nonOptimizedFilter = Expressions.toFilter(
plannerContext,
rowSignature,
virtualColumnRegistry,
expression
);
if (nonOptimizedFilter == null) {
return null;
} else {
filter = Filtration.create(nonOptimizedFilter)
.optimizeFilterOnly(virtualColumnRegistry.getFullRowSignature())
.getDimFilter();
}
} else {
filter = null;
}
final SqlAggregator sqlAggregator = plannerContext.getOperatorTable()
.lookupAggregator(call.getAggregation());
if (sqlAggregator == null) {
return null;
}
// Compute existingAggregations for SqlAggregator impls that want it.
final List existingAggregationsWithSameFilter = new ArrayList<>();
for (Aggregation existingAggregation : existingAggregations) {
if (filter == null) {
final boolean doesMatch = existingAggregation.getAggregatorFactories().stream().noneMatch(
factory -> factory instanceof FilteredAggregatorFactory
);
if (doesMatch) {
existingAggregationsWithSameFilter.add(existingAggregation);
}
} else {
final boolean doesMatch = existingAggregation.getAggregatorFactories().stream().allMatch(
factory -> factory instanceof FilteredAggregatorFactory &&
((FilteredAggregatorFactory) factory).getFilter().equals(filter)
);
if (doesMatch) {
existingAggregationsWithSameFilter.add(
Aggregation.create(
existingAggregation.getVirtualColumns(),
existingAggregation.getAggregatorFactories().stream()
.map(factory -> ((FilteredAggregatorFactory) factory).getAggregator())
.collect(Collectors.toList()),
existingAggregation.getPostAggregator()
)
);
}
}
}
final Aggregation retVal = sqlAggregator.toDruidAggregation(
plannerContext,
rowSignature,
virtualColumnRegistry,
rexBuilder,
name,
call,
project,
existingAggregationsWithSameFilter,
finalizeAggregations
);
if (retVal == null) {
return null;
} else {
// Check if this refers to the existingAggregationsWithSameFilter. If so, no need to apply the filter.
if (isUsingExistingAggregation(retVal, existingAggregationsWithSameFilter)) {
return retVal;
} else {
return retVal.filter(rowSignature, virtualColumnRegistry, filter);
}
}
}
/**
* Checks if "aggregation" is exclusively based on existing aggregations from "existingAggregations'.
*/
private static boolean isUsingExistingAggregation(
final Aggregation aggregation,
final List existingAggregations
)
{
if (!aggregation.getAggregatorFactories().isEmpty()) {
return false;
}
final Set existingAggregationNames = existingAggregations
.stream()
.flatMap(xs -> xs.getAggregatorFactories().stream())
.map(AggregatorFactory::getName)
.collect(Collectors.toSet());
return existingAggregationNames.containsAll(aggregation.getPostAggregator().getDependentFields());
}
}
