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/*
 * Copyright 2021 Hazelcast Inc.
 *
 * Licensed under the Hazelcast Community License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://hazelcast.com/hazelcast-community-license
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.jet.sql.impl.opt.physical;

import com.hazelcast.jet.impl.util.Util;
import com.hazelcast.jet.sql.impl.opt.OptUtils;
import com.hazelcast.jet.sql.impl.opt.logical.UnionLogicalRel;
import com.hazelcast.org.apache.calcite.plan.RelOptRule;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.convert.ConverterRule;

import static com.hazelcast.jet.sql.impl.opt.Conventions.LOGICAL;
import static com.hazelcast.jet.sql.impl.opt.Conventions.PHYSICAL;

final class UnionPhysicalRule extends ConverterRule {

    static final RelOptRule INSTANCE = new UnionPhysicalRule();

    private UnionPhysicalRule() {
        super(
                UnionLogicalRel.class, LOGICAL, PHYSICAL,
                UnionPhysicalRule.class.getSimpleName()
        );
    }

    @Override
    public RelNode convert(RelNode rel) {
        UnionLogicalRel logicalUnion = (UnionLogicalRel) rel;
        return new UnionPhysicalRel(
                logicalUnion.getCluster(),
                OptUtils.toPhysicalConvention(logicalUnion.getTraitSet()),
                Util.toList(logicalUnion.getInputs(), OptUtils::toPhysicalInput),
                logicalUnion.all
        );
    }
}