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* SQL: UNION ALL operator. * Remove unused import.
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219 changes: 219 additions & 0 deletions
219
sql/src/main/java/org/apache/druid/sql/calcite/rel/DruidUnionRel.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,219 @@ | ||
| /* | ||
| * 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; | ||
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|
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| import com.google.common.base.Preconditions; | ||
| import com.google.common.collect.FluentIterable; | ||
| import org.apache.calcite.interpreter.BindableConvention; | ||
| 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 javax.annotation.Nullable; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.stream.Collectors; | ||
|
|
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| public class DruidUnionRel extends DruidRel<DruidUnionRel> | ||
| { | ||
| private final RelDataType rowType; | ||
| private final List<RelNode> rels; | ||
| private final int limit; | ||
|
|
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| private DruidUnionRel( | ||
| final RelOptCluster cluster, | ||
| final RelTraitSet traitSet, | ||
| final QueryMaker queryMaker, | ||
| final RelDataType rowType, | ||
| final List<RelNode> rels, | ||
| final int limit | ||
| ) | ||
| { | ||
| super(cluster, traitSet, queryMaker); | ||
| this.rowType = rowType; | ||
| this.rels = rels; | ||
| this.limit = limit; | ||
| } | ||
|
|
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| public static DruidUnionRel create( | ||
| final QueryMaker queryMaker, | ||
| final RelDataType rowType, | ||
| final List<RelNode> rels, | ||
| final int limit | ||
| ) | ||
| { | ||
| Preconditions.checkState(rels.size() > 0, "rels must be nonempty"); | ||
|
|
||
| return new DruidUnionRel( | ||
| rels.get(0).getCluster(), | ||
| rels.get(0).getTraitSet(), | ||
| queryMaker, | ||
| rowType, | ||
| new ArrayList<>(rels), | ||
| limit | ||
| ); | ||
| } | ||
|
|
||
| @Override | ||
| @Nullable | ||
| public PartialDruidQuery getPartialDruidQuery() | ||
| { | ||
| return null; | ||
| } | ||
|
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| @Override | ||
| public int getQueryCount() | ||
| { | ||
| return rels.stream().mapToInt(rel -> ((DruidRel) rel).getQueryCount()).sum(); | ||
| } | ||
|
|
||
| @Override | ||
| @SuppressWarnings("unchecked") | ||
| public Sequence<Object[]> runQuery() | ||
| { | ||
| // Lazy: run each query in sequence, not all at once. | ||
| if (limit == 0) { | ||
| return Sequences.empty(); | ||
| } else { | ||
| final Sequence baseSequence = Sequences.concat( | ||
| FluentIterable.from(rels).transform(rel -> ((DruidRel) rel).runQuery()) | ||
| ); | ||
|
|
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| return limit > 0 ? baseSequence.limit(limit) : baseSequence; | ||
| } | ||
| } | ||
|
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| @Override | ||
| public DruidUnionRel withPartialQuery(final PartialDruidQuery newQueryBuilder) | ||
| { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
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| @Nullable | ||
| @Override | ||
| public DruidQuery toDruidQuery(final boolean finalizeAggregations) | ||
| { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
|
||
| @Override | ||
| public DruidQuery toDruidQueryForExplaining() | ||
| { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
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| @Override | ||
| public DruidUnionRel asBindable() | ||
| { | ||
| return new DruidUnionRel( | ||
| getCluster(), | ||
| getTraitSet().replace(BindableConvention.INSTANCE), | ||
| getQueryMaker(), | ||
| rowType, | ||
| rels.stream().map(rel -> RelOptRule.convert(rel, BindableConvention.INSTANCE)).collect(Collectors.toList()), | ||
| limit | ||
| ); | ||
| } | ||
|
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| @Override | ||
| public DruidUnionRel asDruidConvention() | ||
| { | ||
| return new DruidUnionRel( | ||
| getCluster(), | ||
| getTraitSet().replace(DruidConvention.instance()), | ||
| getQueryMaker(), | ||
| rowType, | ||
| rels.stream().map(rel -> RelOptRule.convert(rel, DruidConvention.instance())).collect(Collectors.toList()), | ||
| limit | ||
| ); | ||
| } | ||
|
|
||
| @Override | ||
| public List<RelNode> getInputs() | ||
| { | ||
| return rels; | ||
| } | ||
|
|
||
| @Override | ||
| public void replaceInput(int ordinalInParent, RelNode p) | ||
| { | ||
| rels.set(ordinalInParent, p); | ||
| } | ||
|
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| @Override | ||
| public RelNode copy(final RelTraitSet traitSet, final List<RelNode> inputs) | ||
| { | ||
| return new DruidUnionRel( | ||
| getCluster(), | ||
| traitSet, | ||
| getQueryMaker(), | ||
| rowType, | ||
| inputs, | ||
| limit | ||
| ); | ||
| } | ||
|
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| @Override | ||
| public List<String> getDatasourceNames() | ||
| { | ||
| return rels.stream() | ||
| .flatMap(rel -> ((DruidRel<?>) rel).getDatasourceNames().stream()) | ||
| .distinct() | ||
| .collect(Collectors.toList()); | ||
| } | ||
|
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| @Override | ||
| public RelWriter explainTerms(RelWriter pw) | ||
| { | ||
| super.explainTerms(pw); | ||
|
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| for (int i = 0; i < rels.size(); i++) { | ||
| pw.input(StringUtils.format("input#%d", i), rels.get(i)); | ||
| } | ||
|
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| return pw.item("limit", limit); | ||
| } | ||
|
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| @Override | ||
| protected RelDataType deriveRowType() | ||
| { | ||
| return rowType; | ||
| } | ||
|
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| @Override | ||
| public RelOptCost computeSelfCost(final RelOptPlanner planner, final RelMetadataQuery mq) | ||
| { | ||
| return planner.getCostFactory().makeCost(rels.stream().mapToDouble(mq::getRowCount).sum(), 0, 0); | ||
| } | ||
|
|
||
| public int getLimit() | ||
| { | ||
| return limit; | ||
| } | ||
| } |
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