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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.rel;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelOptCost;
import org.apache.calcite.plan.RelOptPlanner;
import org.apache.calcite.plan.RelOptRule;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.RelWriter;
import org.apache.calcite.rel.metadata.RelMetadataQuery;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.druid.java.util.common.StringUtils;
import org.apache.druid.java.util.common.guava.Sequence;
import org.apache.druid.java.util.common.guava.Sequences;
import org.apache.druid.query.QueryDataSource;
import org.apache.druid.query.TableDataSource;
import org.apache.druid.query.groupby.GroupByQuery;
import org.apache.druid.sql.calcite.table.RowSignature;
import javax.annotation.Nullable;
import java.util.List;
/**
* DruidRel that uses a "query" dataSource.
*/
public class DruidOuterQueryRel extends DruidRel
{
private static final TableDataSource DUMMY_DATA_SOURCE = new TableDataSource("__subquery__");
private final PartialDruidQuery partialQuery;
private RelNode sourceRel;
private DruidOuterQueryRel(
RelOptCluster cluster,
RelTraitSet traitSet,
RelNode sourceRel,
PartialDruidQuery partialQuery,
QueryMaker queryMaker
)
{
super(cluster, traitSet, queryMaker);
this.sourceRel = sourceRel;
this.partialQuery = partialQuery;
}
public static DruidOuterQueryRel create(
final DruidRel sourceRel,
final PartialDruidQuery partialQuery
)
{
return new DruidOuterQueryRel(
sourceRel.getCluster(),
sourceRel.getTraitSet(),
sourceRel,
partialQuery,
sourceRel.getQueryMaker()
);
}
@Override
public PartialDruidQuery getPartialDruidQuery()
{
return partialQuery;
}
@Override
public Sequence runQuery()
{
// runQuery doesn't need to finalize aggregations, because the fact that runQuery is happening suggests this
// is the outermost query and it will actually get run as a native query. Druid's native query layer will
// finalize aggregations for the outermost query even if we don't explicitly ask it to.
final DruidQuery query = toDruidQuery(false);
if (query != null) {
return getQueryMaker().runQuery(query);
} else {
return Sequences.empty();
}
}
@Override
public DruidOuterQueryRel withPartialQuery(final PartialDruidQuery newQueryBuilder)
{
return new DruidOuterQueryRel(
getCluster(),
getTraitSet().plusAll(newQueryBuilder.getRelTraits()),
sourceRel,
newQueryBuilder,
getQueryMaker()
);
}
@Override
public int getQueryCount()
{
return 1 + ((DruidRel) sourceRel).getQueryCount();
}
@Nullable
@Override
public DruidQuery toDruidQuery(final boolean finalizeAggregations)
{
// Must finalize aggregations on subqueries.
final DruidQuery subQuery = ((DruidRel) sourceRel).toDruidQuery(true);
if (subQuery == null) {
return null;
}
final GroupByQuery groupByQuery = subQuery.toGroupByQuery();
if (groupByQuery == null) {
throw new CannotBuildQueryException("Subquery could not be converted to GroupBy query");
}
final RowSignature sourceRowSignature = subQuery.getOutputRowSignature();
return partialQuery.build(
new QueryDataSource(groupByQuery),
sourceRowSignature,
getPlannerContext(),
getCluster().getRexBuilder(),
finalizeAggregations
);
}
@Override
public DruidQuery toDruidQueryForExplaining()
{
return partialQuery.build(
DUMMY_DATA_SOURCE,
RowSignature.from(
sourceRel.getRowType().getFieldNames(),
sourceRel.getRowType()
),
getPlannerContext(),
getCluster().getRexBuilder(),
false
);
}
@Override
public DruidOuterQueryRel asDruidConvention()
{
return new DruidOuterQueryRel(
getCluster(),
getTraitSet().plus(DruidConvention.instance()),
RelOptRule.convert(sourceRel, DruidConvention.instance()),
partialQuery,
getQueryMaker()
);
}
@Override
public List getInputs()
{
return ImmutableList.of(sourceRel);
}
@Override
public void replaceInput(int ordinalInParent, RelNode p)
{
if (ordinalInParent != 0) {
throw new IndexOutOfBoundsException(StringUtils.format("Invalid ordinalInParent[%s]", ordinalInParent));
}
this.sourceRel = p;
}
@Override
public RelNode copy(final RelTraitSet traitSet, final List inputs)
{
return new DruidOuterQueryRel(
getCluster(),
traitSet,
Iterables.getOnlyElement(inputs),
getPartialDruidQuery(),
getQueryMaker()
);
}
@Override
public List getDataSourceNames()
{
return ((DruidRel) sourceRel).getDataSourceNames();
}
@Override
public RelWriter explainTerms(RelWriter pw)
{
final String queryString;
final DruidQuery druidQuery = toDruidQueryForExplaining();
try {
queryString = getQueryMaker().getJsonMapper().writeValueAsString(druidQuery.getQuery());
}
catch (JsonProcessingException e) {
throw new RuntimeException(e);
}
return super.explainTerms(pw)
.input("innerQuery", sourceRel)
.item("query", queryString)
.item("signature", druidQuery.getOutputRowSignature());
}
@Override
protected RelDataType deriveRowType()
{
return partialQuery.getRowType();
}
@Override
public RelOptCost computeSelfCost(final RelOptPlanner planner, final RelMetadataQuery mq)
{
return planner.getCostFactory().makeCost(mq.getRowCount(sourceRel), 0, 0).multiplyBy(10);
}
}
