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sql/src/main/java/org/apache/druid/sql/calcite/rel/DruidFreeUnionDataSourceRel.java
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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 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.core.Union; | ||
| 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.query.DataSource; | ||
| import org.apache.druid.query.QueryDataSource; | ||
| import org.apache.druid.query.TableDataSource; | ||
| import org.apache.druid.query.UnionDataSource; | ||
| import org.apache.druid.segment.column.RowSignature; | ||
| import org.apache.druid.sql.calcite.planner.PlannerContext; | ||
| import org.apache.druid.sql.calcite.table.RowSignatures; | ||
|
|
||
| import java.util.ArrayList; | ||
| import java.util.HashSet; | ||
| import java.util.List; | ||
| import java.util.Set; | ||
| import java.util.stream.Collectors; | ||
|
|
||
| /** | ||
| * Represents a query on top of a {@link UnionDataSource}. This is used to represent a "UNION ALL" of regular table | ||
| * datasources. | ||
| * <p> | ||
| * See {@link DruidUnionRel} for a version that can union any set of queries together (not just regular tables), | ||
| * but also must be the outermost rel of a query plan. In the future we expect that {@link UnionDataSource} will gain | ||
| * the ability to union query datasources together, and then this class could replace {@link DruidUnionRel}. | ||
| */ | ||
| public class DruidFreeUnionDataSourceRel extends DruidRel<DruidFreeUnionDataSourceRel> | ||
| { | ||
| private static final TableDataSource DUMMY_DATA_SOURCE = new TableDataSource("__union__"); | ||
|
|
||
| private final Union unionRel; | ||
| private final List<String> unionColumnNames; | ||
| private final PartialDruidQuery partialQuery; | ||
|
|
||
| private DruidFreeUnionDataSourceRel( | ||
| final RelOptCluster cluster, | ||
| final RelTraitSet traitSet, | ||
| final Union unionRel, | ||
| final List<String> unionColumnNames, | ||
| final PartialDruidQuery partialQuery, | ||
| final PlannerContext plannerContext | ||
| ) | ||
| { | ||
| super(cluster, traitSet, plannerContext); | ||
| this.unionRel = unionRel; | ||
| this.unionColumnNames = unionColumnNames; | ||
| this.partialQuery = partialQuery; | ||
| } | ||
|
|
||
| public static DruidFreeUnionDataSourceRel create( | ||
| final Union unionRel, | ||
| final List<String> unionColumnNames, | ||
| final PlannerContext plannerContext | ||
| ) | ||
| { | ||
| return new DruidFreeUnionDataSourceRel( | ||
| unionRel.getCluster(), | ||
| unionRel.getTraitSet(), | ||
| unionRel, | ||
| unionColumnNames, | ||
| PartialDruidQuery.create(unionRel), | ||
| plannerContext | ||
| ); | ||
| } | ||
|
|
||
| public List<String> getUnionColumnNames() | ||
| { | ||
| return unionColumnNames; | ||
| } | ||
|
|
||
| @Override | ||
| public PartialDruidQuery getPartialDruidQuery() | ||
| { | ||
| return partialQuery; | ||
| } | ||
|
|
||
| @Override | ||
| public DruidFreeUnionDataSourceRel withPartialQuery(final PartialDruidQuery newQueryBuilder) | ||
| { | ||
| return new DruidFreeUnionDataSourceRel( | ||
| getCluster(), | ||
| newQueryBuilder.getTraitSet(getConvention()), | ||
| unionRel, | ||
| unionColumnNames, | ||
| newQueryBuilder, | ||
| getPlannerContext() | ||
| ); | ||
| } | ||
|
|
||
| @Override | ||
| public DruidQuery toDruidQuery(final boolean finalizeAggregations) | ||
| { | ||
| final List<DataSource> dataSources = new ArrayList<>(); | ||
| RowSignature signature = null; | ||
|
|
||
| for (final RelNode relNode : unionRel.getInputs()) { | ||
| final DruidRel<?> druidRel = (DruidRel<?>) relNode; | ||
|
|
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| final DruidQuery query = druidRel.toDruidQuery(false); | ||
| final DataSource dataSource; | ||
| if (druidRel instanceof DruidQueryRel) { | ||
| dataSource = query.getDataSource(); | ||
| } else { | ||
| dataSource = new QueryDataSource(query.getQuery()); | ||
| } | ||
|
|
||
| if (signature == null) { | ||
| signature = query.getOutputRowSignature(); | ||
| } | ||
|
|
||
| if (signature.getColumnNames().equals(query.getOutputRowSignature().getColumnNames())) { | ||
| dataSources.add(dataSource); | ||
| } else { | ||
| getPlannerContext().setPlanningError( | ||
| "There is a mismatch between the output row signature of input tables and the row signature of union output."); | ||
| throw new CannotBuildQueryException(druidRel); | ||
| } | ||
| } | ||
|
|
||
| if (signature == null) { | ||
| // No inputs. | ||
| throw new CannotBuildQueryException(unionRel); | ||
| } | ||
|
|
||
| // Sanity check: the columns we think we're building off must equal the "unionColumnNames" registered at | ||
| // creation time. | ||
| if (!signature.getColumnNames().equals(unionColumnNames)) { | ||
| throw new CannotBuildQueryException(unionRel); | ||
| } | ||
|
|
||
| return partialQuery.build( | ||
| new UnionDataSource(dataSources), | ||
| signature, | ||
| getPlannerContext(), | ||
| getCluster().getRexBuilder(), | ||
| finalizeAggregations | ||
| ); | ||
| } | ||
|
|
||
| @Override | ||
| public DruidQuery toDruidQueryForExplaining() | ||
| { | ||
| return partialQuery.build( | ||
| DUMMY_DATA_SOURCE, | ||
| RowSignatures.fromRelDataType( | ||
| unionRel.getRowType().getFieldNames(), | ||
| unionRel.getRowType() | ||
| ), | ||
| getPlannerContext(), | ||
| getCluster().getRexBuilder(), | ||
| false | ||
| ); | ||
| } | ||
|
|
||
| @Override | ||
| public DruidFreeUnionDataSourceRel asDruidConvention() | ||
| { | ||
| return new DruidFreeUnionDataSourceRel( | ||
| getCluster(), | ||
| getTraitSet().replace(DruidConvention.instance()), | ||
| (Union) unionRel.copy( | ||
| unionRel.getTraitSet(), | ||
| unionRel.getInputs() | ||
| .stream() | ||
| .map(input -> RelOptRule.convert(input, DruidConvention.instance())) | ||
| .collect(Collectors.toList()) | ||
| ), | ||
| unionColumnNames, | ||
| partialQuery, | ||
| getPlannerContext() | ||
| ); | ||
| } | ||
|
|
||
| @Override | ||
| public List<RelNode> getInputs() | ||
| { | ||
| return unionRel.getInputs(); | ||
| } | ||
|
|
||
| @Override | ||
| public void replaceInput(int ordinalInParent, RelNode p) | ||
| { | ||
| unionRel.replaceInput(ordinalInParent, p); | ||
| } | ||
|
|
||
| @Override | ||
| public RelNode copy(final RelTraitSet traitSet, final List<RelNode> inputs) | ||
| { | ||
| return new DruidFreeUnionDataSourceRel( | ||
| getCluster(), | ||
| traitSet, | ||
| (Union) unionRel.copy(unionRel.getTraitSet(), inputs), | ||
| unionColumnNames, | ||
| partialQuery, | ||
| getPlannerContext() | ||
| ); | ||
| } | ||
|
|
||
| @Override | ||
| public Set<String> getDataSourceNames() | ||
| { | ||
| final Set<String> retVal = new HashSet<>(); | ||
|
|
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| for (final RelNode input : unionRel.getInputs()) { | ||
| retVal.addAll(((DruidRel<?>) input).getDataSourceNames()); | ||
| } | ||
|
|
||
| return retVal; | ||
| } | ||
|
|
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| @Override | ||
| public RelWriter explainTerms(RelWriter pw) | ||
| { | ||
| final String queryString; | ||
| final DruidQuery druidQuery = toDruidQueryForExplaining(); | ||
|
|
||
| try { | ||
| queryString = getPlannerContext().getJsonMapper().writeValueAsString(druidQuery.getQuery()); | ||
| } | ||
| catch (JsonProcessingException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
|
|
||
| for (int i = 0; i < unionRel.getInputs().size(); i++) { | ||
| pw.input(StringUtils.format("input#%d", i), unionRel.getInputs().get(i)); | ||
| } | ||
|
|
||
| return pw.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().makeZeroCost(); | ||
| } | ||
| } |
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