TransposeAggSemiJoin.java

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package org.apache.doris.nereids.rules.exploration;

import org.apache.doris.nereids.rules.Rule;
import org.apache.doris.nereids.rules.RuleType;
import org.apache.doris.nereids.rules.rewrite.TransposeSemiJoinAgg;
import org.apache.doris.nereids.trees.plans.GroupPlan;
import org.apache.doris.nereids.trees.plans.logical.LogicalJoin;

/**
 * Pull up SemiJoin through Agg.
 */
public class TransposeAggSemiJoin extends OneExplorationRuleFactory {
    public static final TransposeAggSemiJoin INSTANCE = new TransposeAggSemiJoin();

    @Override
    public Rule build() {
        return logicalAggregate(
                logicalJoin().when(join -> join.getJoinType().isLeftSemiOrAntiJoin() && !join.isMarkJoin()))
                .then(agg -> {
                    LogicalJoin<GroupPlan, GroupPlan> join = agg.child();
                    if (!TransposeSemiJoinAgg.canTranspose(agg, join)) {
                        return null;
                    }
                    return join.withChildren(agg.withChildren(join.left()), join.right());
                })
                .toRule(RuleType.TRANSPOSE_LOGICAL_AGG_SEMI_JOIN);
    }
}