fe/fe-core/src/main/java/org/apache/doris/nereids/pattern/GroupMatching.java

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package org.apache.doris.nereids.pattern;

import org.apache.doris.nereids.memo.Group;
import org.apache.doris.nereids.memo.GroupExpression;
import org.apache.doris.nereids.trees.plans.GroupPlan;
import org.apache.doris.nereids.trees.plans.Plan;

import java.util.ArrayList;
import java.util.List;

/**
 * Get all pattern matching subtree in query plan from a group.
 */
public class GroupMatching {
    /**
     * Get all pattern matching subtree in query plan from a group.
     */
    public static List<Plan> getAllMatchingPlans(Pattern pattern, Group group) {
        List<Plan> matchingPlans = new ArrayList<>();
        if (pattern.isGroup() || pattern.isMultiGroup()) {
            GroupPlan groupPlan = new GroupPlan(group);
            if (((Pattern<Plan>) pattern).matchPredicates(groupPlan)) {
                matchingPlans.add(groupPlan);
            }
        } else {
            for (GroupExpression groupExpression : group.getLogicalExpressions()) {
                for (Plan plan : new GroupExpressionMatching(pattern, groupExpression)) {
                    matchingPlans.add(plan);
                }
            }
            for (GroupExpression groupExpression : group.getPhysicalExpressions()) {
                for (Plan plan : new GroupExpressionMatching(pattern, groupExpression)) {
                    matchingPlans.add(plan);
                }
            }
        }
        return matchingPlans;
    }
}