com.hazelcast.org.apache.calcite.adapter.enumerable.EnumerableUnionRule Maven / Gradle / Ivy
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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 com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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 com.hazelcast.org.apache.calcite.adapter.enumerable;
import com.hazelcast.org.apache.calcite.plan.Convention;
import com.hazelcast.org.apache.calcite.plan.RelTraitSet;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.convert.ConverterRule;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalUnion;
import com.hazelcast.com.google.com.hazelcast.com.on.collect.Lists;
import java.util.List;
/**
* Rule to convert an {@link com.hazelcast.org.apache.calcite.rel.logical.LogicalUnion} to an
* {@link EnumerableUnion}.
*/
class EnumerableUnionRule extends ConverterRule {
EnumerableUnionRule() {
super(LogicalUnion.class, Convention.NONE, EnumerableConvention.INSTANCE,
"EnumerableUnionRule");
}
public RelNode convert(RelNode rel) {
final LogicalUnion union = (LogicalUnion) rel;
final EnumerableConvention out = EnumerableConvention.INSTANCE;
final RelTraitSet traitSet = rel.getCluster().traitSet().replace(out);
final List newInputs = Lists.transform(
union.getInputs(), n -> convert(n, traitSet));
return new EnumerableUnion(rel.getCluster(), traitSet,
newInputs, union.all);
}
}