UnassignedQueryConstantJob.java

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package org.apache.doris.nereids.trees.plans.distribute.worker.job;

import org.apache.doris.nereids.StatementContext;
import org.apache.doris.nereids.trees.plans.distribute.DistributeContext;
import org.apache.doris.nereids.trees.plans.distribute.worker.DistributedPlanWorker;
import org.apache.doris.planner.ExchangeNode;
import org.apache.doris.planner.PlanFragment;
import org.apache.doris.qe.ConnectContext;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ListMultimap;

import java.util.List;

/** UnassignedQueryConstantJob */
public class UnassignedQueryConstantJob extends AbstractUnassignedJob {
    public UnassignedQueryConstantJob(StatementContext statementContext, PlanFragment fragment) {
        super(statementContext, fragment, ImmutableList.of(), ArrayListMultimap.create());
    }

    @Override
    public List<AssignedJob> computeAssignedJobs(
            DistributeContext distributeContext, ListMultimap<ExchangeNode, AssignedJob> inputJobs) {
        DistributedPlanWorker randomWorker = distributeContext.selectedWorkers.tryToSelectRandomUsedWorker();
        ConnectContext connectContext = statementContext.getConnectContext();
        return ImmutableList.of(
                new StaticAssignedJob(0, connectContext.nextInstanceId(), this,
                        randomWorker, new DefaultScanSource(ImmutableMap.of())
                )
        );
    }
}