PlanContext.java

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package org.apache.doris.nereids;

import org.apache.doris.nereids.memo.GroupExpression;
import org.apache.doris.nereids.properties.DistributionSpecReplicated;
import org.apache.doris.nereids.properties.PhysicalProperties;
import org.apache.doris.nereids.trees.plans.Plan;
import org.apache.doris.qe.ConnectContext;
import org.apache.doris.qe.SessionVariable;
import org.apache.doris.statistics.Statistics;

import java.util.List;

/**
 * Context for plan.
 * Abstraction for group expressions and stand-alone expressions/DAGs.
 * A ExpressionHandle is attached to either {@link Plan} or {@link GroupExpression}.
 * Inspired by GPORCA-CExpressionHandle.
 */
public class PlanContext {
    private final ConnectContext connectContext;
    private final GroupExpression groupExpression;
    private final boolean isBroadcastJoin;

    /**
     * Constructor for PlanContext.
     */
    public PlanContext(ConnectContext connectContext, GroupExpression groupExpression,
            List<PhysicalProperties> childrenProperties) {
        this.connectContext = connectContext;
        this.groupExpression = groupExpression;
        if (childrenProperties.size() >= 2
                && childrenProperties.get(1).getDistributionSpec() instanceof DistributionSpecReplicated) {
            isBroadcastJoin = true;
        } else {
            isBroadcastJoin = false;
        }
    }

    public SessionVariable getSessionVariable() {
        return connectContext.getSessionVariable();
    }

    public boolean isBroadcastJoin() {
        return isBroadcastJoin;
    }

    public int arity() {
        return groupExpression.arity();
    }

    public Statistics getStatisticsWithCheck() {
        return groupExpression.getOwnerGroup().getStatistics();
    }

    public boolean isStatsReliable() {
        return groupExpression.getOwnerGroup().isStatsReliable();
    }

    /**
     * Get child statistics.
     */
    public Statistics getChildStatistics(int index) {
        return groupExpression.childStatistics(index);
    }

    public StatementContext getStatementContext() {
        return connectContext.getStatementContext();
    }
}