hazelcast-master/hazelcast-sql/src/main/java/com/hazelcast/jet/sql/impl/opt/logical/AggregateLogicalRule.java
/*
 * Copyright 2023 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 org.apache.calcite.plan.Convention;
import org.apache.calcite.plan.RelOptRule;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.convert.ConverterRule;
import org.apache.calcite.rel.logical.LogicalAggregate;

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

final class AggregateLogicalRule extends ConverterRule {

    static final RelOptRule INSTANCE = new AggregateLogicalRule();

    private AggregateLogicalRule() {
        super(
                LogicalAggregate.class, Convention.NONE, LOGICAL,
                AggregateLogicalRule.class.getSimpleName()
        );
    }

    @Override
    public RelNode convert(RelNode rel) {
        LogicalAggregate aggregate = (LogicalAggregate) rel;

        return new AggregateLogicalRel(
                aggregate.getCluster(),
                OptUtils.toLogicalConvention(aggregate.getTraitSet()),
                OptUtils.toLogicalInput(aggregate.getInput(0)),
                aggregate.getGroupSet(),
                aggregate.getGroupSets(),
                aggregate.getAggCallList()
        );
    }
}
