LogicalSortToPhysicalQuickSort.java

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

import org.apache.doris.nereids.rules.Rule;
import org.apache.doris.nereids.rules.RuleType;
import org.apache.doris.nereids.trees.plans.Plan;
import org.apache.doris.nereids.trees.plans.SortPhase;
import org.apache.doris.nereids.trees.plans.logical.LogicalSort;
import org.apache.doris.nereids.trees.plans.physical.PhysicalQuickSort;

import com.google.common.collect.Lists;

import java.util.List;

/**
 * Implementation rule that convert logical sort to physical sort.
 */
public class LogicalSortToPhysicalQuickSort extends OneImplementationRuleFactory {
    @Override
    public Rule build() {
        return logicalSort().thenApplyMulti(ctx -> twoPhaseSort(ctx.root))
                .toRule(RuleType.LOGICAL_SORT_TO_PHYSICAL_QUICK_SORT_RULE);
    }

    private List<PhysicalQuickSort<? extends Plan>> twoPhaseSort(LogicalSort<? extends Plan> logicalSort) {
        PhysicalQuickSort<Plan> localSort = new PhysicalQuickSort<>(logicalSort.getOrderKeys(),
                SortPhase.LOCAL_SORT, logicalSort.getLogicalProperties(), logicalSort.child(0));
        PhysicalQuickSort<Plan> twoPhaseSort = new PhysicalQuickSort<>(
                logicalSort.getOrderKeys(),
                SortPhase.MERGE_SORT, logicalSort.getLogicalProperties(),
                localSort);
        PhysicalQuickSort<Plan> onePhaseSort = new PhysicalQuickSort<>(
                logicalSort.getOrderKeys(),
                SortPhase.GATHER_SORT, logicalSort.getLogicalProperties(),
                localSort.child(0));
        return Lists.newArrayList(twoPhaseSort, onePhaseSort);
    }
}