NereidsSpecifyInstances.java

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

import org.apache.doris.nereids.StatementContext;
import org.apache.doris.nereids.trees.plans.distribute.worker.DistributedPlanWorker;
import org.apache.doris.nereids.trees.plans.distribute.worker.job.AssignedJob;
import org.apache.doris.nereids.trees.plans.distribute.worker.job.ScanSource;
import org.apache.doris.nereids.trees.plans.distribute.worker.job.StaticAssignedJob;
import org.apache.doris.nereids.trees.plans.distribute.worker.job.UnassignedJob;
import org.apache.doris.nereids.trees.plans.distribute.worker.job.WorkerScanSource;
import org.apache.doris.qe.ConnectContext;
import org.apache.doris.thrift.TUniqueId;

import com.google.common.collect.Lists;

import java.util.List;
import java.util.Objects;

/** NereidsSpecifyInstances */
public abstract class NereidsSpecifyInstances<S extends ScanSource> {
    public final StatementContext statementContext;
    public final List<WorkerScanSource<S>> workerScanSources;

    public NereidsSpecifyInstances(StatementContext statementContext, List<WorkerScanSource<S>> workerScanSources) {
        this.statementContext = Objects.requireNonNull(statementContext, "statementContext can not be null");
        this.workerScanSources = Objects.requireNonNull(workerScanSources,
                "workerScanSources can not be null");
    }

    /** buildAssignedJobs */
    public List<AssignedJob> buildAssignedJobs(UnassignedJob unassignedJob) {
        List<AssignedJob> instances = Lists.newArrayListWithCapacity(workerScanSources.size());
        int instanceNum = 0;
        ConnectContext context = statementContext.getConnectContext();
        for (WorkerScanSource<S> workerToScanSource : workerScanSources) {
            TUniqueId instanceId = context.nextInstanceId();
            DistributedPlanWorker worker = workerToScanSource.worker;
            ScanSource scanSource = workerToScanSource.scanSource;
            StaticAssignedJob assignedJob = new StaticAssignedJob(
                    instanceNum++, instanceId, unassignedJob, worker, scanSource
            );
            instances.add(assignedJob);
        }
        return instances;
    }
}