hazelcast-master/hazelcast-sql/src/main/java/com/hazelcast/jet/sql/impl/opt/physical/JoinHashPhysicalRel.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.physical;

import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelOptCost;
import org.apache.calcite.plan.RelOptPlanner;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.core.Join;
import org.apache.calcite.rel.core.JoinRelType;
import org.apache.calcite.rel.metadata.RelMetadataQuery;
import org.apache.calcite.rex.RexNode;
import org.checkerframework.checker.nullness.qual.Nullable;

public class JoinHashPhysicalRel extends JoinPhysicalRel {
    private static final double COST_FACTOR = 1.1;

    JoinHashPhysicalRel(
            RelOptCluster cluster,
            RelTraitSet traitSet,
            RelNode left,
            RelNode right,
            RexNode condition,
            JoinRelType joinType
    ) {
        super(cluster, traitSet, left, right, condition, joinType);
    }

    @Override
    public <V> V accept(CreateDagVisitor<V> visitor) {
        return visitor.onHashJoin(this);
    }

    @Override
    public Join copy(
            RelTraitSet traitSet,
            RexNode conditionExpr,
            RelNode left,
            RelNode right,
            JoinRelType joinType,
            boolean semiJoinDone
    ) {
        return new JoinHashPhysicalRel(getCluster(), traitSet, left, right, conditionExpr, joinType);
    }

    @Override
    @Nullable
    public RelOptCost computeSelfCost(RelOptPlanner planner, RelMetadataQuery mq) {
        return super.computeSelfCost(planner, mq).multiplyBy(COST_FACTOR);
    }
}
