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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.logical;

import com.hazelcast.jet.sql.impl.opt.OptUtils;
import com.hazelcast.org.apache.calcite.plan.Convention;
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 com.hazelcast.org.apache.calcite.rel.core.Union;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalUnion;

import static com.hazelcast.jet.impl.util.Util.toList;
import static com.hazelcast.jet.sql.impl.opt.JetConventions.LOGICAL;

final class UnionLogicalRule extends ConverterRule {

    static final RelOptRule INSTANCE = new UnionLogicalRule();

    private UnionLogicalRule() {
        super(
                LogicalUnion.class, Convention.NONE, LOGICAL,
                UnionLogicalRule.class.getSimpleName()
        );
    }

    @Override
    public RelNode convert(RelNode rel) {
        Union union = (Union) rel;

        return new UnionLogicalRel(
                union.getCluster(),
                OptUtils.toLogicalConvention(union.getTraitSet()),
                toList(union.getInputs(), OptUtils::toLogicalInput),
                union.all
        );
    }
}