PaimonPartitionInfoLoader.java

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package org.apache.doris.datasource.metacache.paimon;

import org.apache.doris.catalog.Column;
import org.apache.doris.common.AnalysisException;
import org.apache.doris.datasource.CacheException;
import org.apache.doris.datasource.NameMapping;
import org.apache.doris.datasource.paimon.PaimonPartitionInfo;
import org.apache.doris.datasource.paimon.PaimonUtil;

import org.apache.commons.collections4.CollectionUtils;
import org.apache.paimon.manifest.PartitionEntry;
import org.apache.paimon.table.Table;

import java.util.List;

/**
 * Loads typed partition metadata from the same snapshot-scoped table used to plan the query.
 */
public final class PaimonPartitionInfoLoader {
    public PaimonPartitionInfo load(NameMapping nameMapping, Table snapshotTable, List<Column> partitionColumns)
            throws AnalysisException {
        if (CollectionUtils.isEmpty(partitionColumns)) {
            return PaimonPartitionInfo.EMPTY;
        }
        try {
            // Catalog.listPartitions exposes path-oriented string specs. Paimon intentionally
            // maps null and blank strings to the same partition.default-name there, so those
            // specs cannot be used as logical partition identities. PartitionEntry retains the
            // typed BinaryRow and is also bound to the data snapshot represented by this table.
            List<PartitionEntry> partitionEntries =
                    snapshotTable.newReadBuilder().newScan().listPartitionEntries();
            return PaimonUtil.generatePartitionInfo(snapshotTable, partitionColumns, partitionEntries);
        } catch (Exception e) {
            throw new CacheException("failed to load paimon partition info %s.%s.%s: %s",
                    e, nameMapping.getCtlId(), nameMapping.getLocalDbName(), nameMapping.getLocalTblName(),
                    e.getMessage());
        }
    }
}