org.apache.kylin.query.optrule.OLAPToEnumerableConverterRule 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 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.kylin.query.optrule;

import org.apache.calcite.adapter.enumerable.EnumerableConvention;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.convert.ConverterRule;
import org.apache.kylin.query.relnode.OLAPRel;
import org.apache.kylin.query.relnode.OLAPToEnumerableConverter;

/**
 */
public class OLAPToEnumerableConverterRule extends ConverterRule {

    public static final ConverterRule INSTANCE = new OLAPToEnumerableConverterRule();

    public OLAPToEnumerableConverterRule() {
        super(RelNode.class, OLAPRel.CONVENTION, EnumerableConvention.INSTANCE, "OLAPToEnumerableConverterRule");
    }

    @Override
    public RelNode convert(RelNode rel) {
        RelTraitSet newTraitSet = rel.getTraitSet().replace(getOutConvention());
        return new OLAPToEnumerableConverter(rel.getCluster(), newTraitSet, rel);
    }

}