StreamConsumptionInfoExtractor.java

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package org.apache.doris.nereids.trees.plans.commands.insert;

import org.apache.doris.catalog.stream.AbstractTableStreamUpdate;
import org.apache.doris.catalog.stream.OlapTableStreamUpdate;
import org.apache.doris.catalog.stream.OlapTableStreamWrapper;
import org.apache.doris.catalog.stream.TableStreamUpdateInfo;
import org.apache.doris.common.Pair;
import org.apache.doris.nereids.trees.plans.Plan;
import org.apache.doris.nereids.trees.plans.logical.LogicalOlapTableStreamScan;
import org.apache.doris.nereids.trees.plans.visitor.DefaultPlanVisitor;

import com.google.common.collect.Maps;

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

/**
 * Extract table stream consumption info from analyzed plan.
 */
public class StreamConsumptionInfoExtractor {

    /**
     * Extract table stream consumption info from a plan.
     *
     * @param analyzedPlan the plan to extract table stream consumption info from
     * @return the extracted merged table stream consumption info
     */
    public static List<TableStreamUpdateInfo> extract(Plan analyzedPlan) {
        if (analyzedPlan == null) {
            return new ArrayList<>();
        }
        Map<Pair<Long, Long>, AbstractTableStreamUpdate> distinctUpdate = Maps.newHashMap();
        analyzedPlan.accept(StreamConsumptionCollector.INSTANCE, distinctUpdate);

        List<TableStreamUpdateInfo> infos = new ArrayList<>(distinctUpdate.size());
        distinctUpdate.forEach((key, value) -> infos.add(new TableStreamUpdateInfo(key.first, key.second, value)));
        return infos;
    }

    /**
     * Plan visitor to collect table stream consumption info
     */
    private static class StreamConsumptionCollector
            extends DefaultPlanVisitor<Void, Map<Pair<Long, Long>, AbstractTableStreamUpdate>> {
        private static final StreamConsumptionCollector INSTANCE = new StreamConsumptionCollector();

        @Override
        public Void visitLogicalOlapTableStreamScan(LogicalOlapTableStreamScan scan,
                Map<Pair<Long, Long>, AbstractTableStreamUpdate> distinctUpdate) {
            if (scan.isSnapshot()) {
                return null;
            }
            OlapTableStreamWrapper wrapper = (OlapTableStreamWrapper) scan.getTable();
            OlapTableStreamUpdate update = toOlapTableStreamUpdate(wrapper);
            if (update.getNext().isEmpty()) {
                return null;
            }

            Pair<Long, Long> key = Pair.of(wrapper.getStreamDbId(), wrapper.getStreamId());
            if (!distinctUpdate.containsKey(key)) {
                distinctUpdate.put(key, new OlapTableStreamUpdate());
            }
            distinctUpdate.get(key).merge(update);
            return null;
        }

        private OlapTableStreamUpdate toOlapTableStreamUpdate(OlapTableStreamWrapper wrapper) {
            Map<Long, Long> prev = Maps.newHashMapWithExpectedSize(wrapper.getOutputUpdateMap().size());
            Map<Long, Long> next = Maps.newHashMapWithExpectedSize(wrapper.getOutputUpdateMap().size());
            for (Map.Entry<Long, Pair<Long, Long>> entry : wrapper.getOutputUpdateMap().entrySet()) {
                Pair<Long, Long> update = entry.getValue();
                if (update.first != null) {
                    prev.put(entry.getKey(), update.first);
                }
                if (update.second != null) {
                    next.put(entry.getKey(), update.second);
                } else {
                    next.put(entry.getKey(), wrapper.getPartition(entry.getKey()).getTso());
                }
            }
            return new OlapTableStreamUpdate(prev, next);
        }
    }
}