org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveUnion Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
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* 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,
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package org.apache.hadoop.hive.ql.optimizer.calcite.reloperators;
import java.util.List;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.core.RelFactories;
import org.apache.calcite.rel.core.SetOp;
import org.apache.calcite.rel.core.Union;
import org.apache.calcite.sql.SqlKind;
import org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveRelNode.Implementor;
public class HiveUnion extends Union {
public static final HiveUnionRelFactory UNION_REL_FACTORY = new HiveUnionRelFactory();
public HiveUnion(RelOptCluster cluster, RelTraitSet traits, List inputs) {
super(cluster, traits, inputs, true);
}
@Override
public SetOp copy(RelTraitSet traitSet, List inputs, boolean all) {
return new HiveUnion(this.getCluster(), traitSet, inputs);
}
public void implement(Implementor implementor) {
}
private static class HiveUnionRelFactory implements RelFactories.SetOpFactory {
@Override
public RelNode createSetOp(SqlKind kind, List inputs, boolean all) {
if (kind != SqlKind.UNION) {
throw new IllegalStateException("Expected to get Set operator of type Union. Found : " + kind);
}
return new HiveUnion(inputs.get(0).getCluster(), inputs.get(0).getTraitSet(), inputs);
}
}
}