PlanPostProcessor.java

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package org.apache.doris.nereids.processor.post;

import org.apache.doris.nereids.CascadesContext;
import org.apache.doris.nereids.trees.plans.Plan;
import org.apache.doris.nereids.trees.plans.physical.AbstractPhysicalPlan;
import org.apache.doris.nereids.trees.plans.visitor.DefaultPlanRewriter;

/**
 * PlanPostprocessor: a PlanVisitor to rewrite PhysicalPlan to new PhysicalPlan.
 */
public class PlanPostProcessor extends DefaultPlanRewriter<CascadesContext> {
    @Override
    public Plan visit(Plan plan, CascadesContext context) {
        AbstractPhysicalPlan newPlan = (AbstractPhysicalPlan) super.visit(plan, context);
        return newPlan == plan ? plan : newPlan.copyStatsAndGroupIdFrom((AbstractPhysicalPlan) plan);
    }

    public Plan processRoot(Plan plan, CascadesContext ctx) {
        return plan.accept(this, ctx);
    }
}