/**
* 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.drill.exec.planner.common;
import java.util.List;
import org.eigenbase.rel.InvalidRelException;
import org.eigenbase.rel.RelNode;
import org.eigenbase.rel.UnionRelBase;
import org.eigenbase.relopt.RelOptCluster;
import org.eigenbase.relopt.RelOptUtil;
import org.eigenbase.relopt.RelTraitSet;
import org.eigenbase.reltype.RelDataType;
import org.eigenbase.reltype.RelDataTypeField;
import org.eigenbase.sql.type.SqlTypeName;
import org.eigenbase.util.Pair;
/**
* Base class for logical and physical Union implemented in Drill
*/
public abstract class DrillUnionRelBase extends UnionRelBase implements DrillRelNode {
public DrillUnionRelBase(RelOptCluster cluster, RelTraitSet traits,
List<RelNode> inputs, boolean all) throws InvalidRelException {
super(cluster, traits, inputs, all);
// if (! this.isHomogeneous(false /* don't compare names */)) {
if (! this.isCompatible(false /* don't compare names */, true /* allow substrings */)) {
throw new InvalidRelException("Input row types of the Union are not compatible.");
}
}
public boolean isCompatible(boolean compareNames, boolean allowSubstring) {
RelDataType unionType = getRowType();
for (RelNode input : getInputs()) {
if (! DrillRelOptUtil.areRowTypesEqual(
input.getRowType(), unionType, compareNames, allowSubstring)) {
return false;
}
}
return true;
}
}