PruneOlapScanTablet.java

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package org.apache.doris.nereids.rules.rewrite;

import org.apache.doris.catalog.DistributionInfo;
import org.apache.doris.catalog.DistributionInfo.DistributionInfoType;
import org.apache.doris.catalog.HashDistributionInfo;
import org.apache.doris.catalog.MaterializedIndex;
import org.apache.doris.catalog.OlapTable;
import org.apache.doris.catalog.Partition;
import org.apache.doris.nereids.rules.Rule;
import org.apache.doris.nereids.rules.RuleType;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.visitor.ExpressionColumnFilterConverter;
import org.apache.doris.nereids.trees.plans.logical.LogicalOlapScan;
import org.apache.doris.nereids.util.ExpressionUtils;
import org.apache.doris.planner.HashDistributionPruner;
import org.apache.doris.planner.PartitionColumnFilter;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableList.Builder;
import org.apache.commons.collections.map.CaseInsensitiveMap;

import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;

/**
 * prune bucket
 */
public class PruneOlapScanTablet extends OneRewriteRuleFactory {
    @Override
    public Rule build() {
        return logicalFilter(logicalOlapScan()).then(filter -> {
            LogicalOlapScan olapScan = filter.child();
            OlapTable table = olapScan.getTable();
            Builder<Long> selectedTabletIdsBuilder = ImmutableList.builder();
            if (olapScan.getManuallySpecifiedTabletIds().isEmpty()) {
                for (Long id : olapScan.getSelectedPartitionIds()) {
                    Partition partition = table.getPartition(id);
                    MaterializedIndex index = partition.getIndex(olapScan.getSelectedIndexId());
                    selectedTabletIdsBuilder
                            .addAll(getSelectedTabletIds(filter.getConjuncts(), index,
                                    olapScan.getSelectedIndexId() == olapScan.getTable()
                                            .getBaseIndexId(),
                                    partition.getDistributionInfo()));
                }
            } else {
                selectedTabletIdsBuilder.addAll(olapScan.getManuallySpecifiedTabletIds());
            }
            List<Long> selectedTabletIds = selectedTabletIdsBuilder.build();
            if (new HashSet<>(selectedTabletIds).equals(new HashSet<>(olapScan.getManuallySpecifiedTabletIds()))) {
                return null;
            }
            return filter.withChildren(olapScan.withSelectedTabletIds(selectedTabletIds));
        }).toRule(RuleType.OLAP_SCAN_TABLET_PRUNE);
    }

    private Collection<Long> getSelectedTabletIds(Set<Expression> expressions,
            MaterializedIndex index, boolean isBaseIndexSelected, DistributionInfo info) {
        if (info.getType() != DistributionInfoType.HASH) {
            return index.getTabletIdsInOrder();
        }
        HashDistributionInfo hashInfo = (HashDistributionInfo) info;
        Map<String, PartitionColumnFilter> filterMap = new CaseInsensitiveMap();
        expressions.stream().map(ExpressionUtils::checkAndMaybeCommute).filter(Optional::isPresent)
                .forEach(expr -> new ExpressionColumnFilterConverter(filterMap).convert(expr.get()));
        return new HashDistributionPruner(index.getTabletIdsInOrder(),
                hashInfo.getDistributionColumns(),
                filterMap,
                hashInfo.getBucketNum(),
                isBaseIndexSelected
        ).prune();
    }
}