com.hazelcast.jet.sql.impl.opt.physical.JoinHashPhysicalRel Maven / Gradle / Ivy

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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.core.Vertex;
import com.hazelcast.jet.sql.impl.JetJoinInfo;
import com.hazelcast.sql.impl.QueryParameterMetadata;
import com.hazelcast.sql.impl.expression.Expression;
import com.hazelcast.org.apache.calcite.plan.RelOptCluster;
import com.hazelcast.org.apache.calcite.plan.RelOptCost;
import com.hazelcast.org.apache.calcite.plan.RelOptPlanner;
import com.hazelcast.org.apache.calcite.plan.RelTraitSet;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.core.Join;
import com.hazelcast.org.apache.calcite.rel.core.JoinRelType;
import com.hazelcast.org.apache.calcite.rel.metadata.RelMetadataQuery;
import com.hazelcast.org.apache.calcite.rex.RexNode;
import com.hazelcast.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);
    }

    public JetJoinInfo joinInfo(QueryParameterMetadata parameterMetadata) {
        int[] leftKeys = analyzeCondition().leftKeys.toIntArray();
        int[] rightKeys = analyzeCondition().rightKeys.toIntArray();

        Expression nonEquiCondition = filter(
                schema(parameterMetadata),
                analyzeCondition().getRemaining(getCluster().getRexBuilder()),
                parameterMetadata
        );

        Expression condition = filter(schema(parameterMetadata), getCondition(), parameterMetadata);

        return new JetJoinInfo(getJoinType(), leftKeys, rightKeys, nonEquiCondition, condition);
    }

    @Override
    public Vertex accept(CreateDagVisitor 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);
    }
}