UnassignedScanMetadataJob.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.nereids.trees.plans.distribute.worker.DistributedPlanWorkerManager;
import org.apache.doris.nereids.trees.plans.distribute.worker.ScanWorkerSelector;
import org.apache.doris.planner.ExchangeNode;
import org.apache.doris.planner.PlanFragment;
import org.apache.doris.planner.SchemaScanNode;

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

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

/** UnassignedScanMetadataJob */
public class UnassignedScanMetadataJob extends AbstractUnassignedScanJob {
    private final SchemaScanNode schemaScanNode;
    private final ScanWorkerSelector scanWorkerSelector;

    public UnassignedScanMetadataJob(
            StatementContext statementContext, PlanFragment fragment,
            SchemaScanNode schemaScanNode, ScanWorkerSelector scanWorkerSelector) {
        super(statementContext, fragment, ImmutableList.of(schemaScanNode), ArrayListMultimap.create());
        this.scanWorkerSelector = Objects.requireNonNull(
                scanWorkerSelector, "scanWorkerSelector cat not be null");
        this.schemaScanNode = schemaScanNode;
    }

    @Override
    protected Map<DistributedPlanWorker, UninstancedScanSource> multipleMachinesParallelization(
            DistributeContext distributeContext, ListMultimap<ExchangeNode, AssignedJob> inputJobs) {
        return scanWorkerSelector.selectReplicaAndWorkerWithoutBucket(
                schemaScanNode, statementContext.getConnectContext()
        );
    }

    @Override
    protected List<AssignedJob> fillUpAssignedJobs(List<AssignedJob> assignedJobs,
            DistributedPlanWorkerManager workerManager, ListMultimap<ExchangeNode, AssignedJob> inputJobs) {
        if (assignedJobs.isEmpty()) {
            return fillUpSingleEmptyInstance(workerManager);
        }
        return assignedJobs;
    }

    @Override
    public String toString() {
        return getClass().getSimpleName() + "(tableName="
                + schemaScanNode.getSchemaCatalog()
                + "." + schemaScanNode.getSchemaDb()
                + "." + schemaScanNode.getTableName()
                + ")";
    }
}