DistributionSpecIcebergTableSinkHashPartitioned.java

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package org.apache.doris.nereids.properties;

import org.apache.doris.nereids.trees.expressions.ExprId;

import com.google.common.collect.ImmutableList;

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

/** Hash final Iceberg partition values to a unique external table sink writer. */
public final class DistributionSpecIcebergTableSinkHashPartitioned
        extends DistributionSpecExternalTableSinkHashPartitioned {

    private final ImmutableList<String> partitionTransforms;

    /** Create an Iceberg ownership distribution from source columns and positional transforms. */
    public DistributionSpecIcebergTableSinkHashPartitioned(
            List<ExprId> outputColumnExprIds, List<String> partitionTransforms) {
        super(outputColumnExprIds);
        this.partitionTransforms = ImmutableList.copyOf(
                Objects.requireNonNull(partitionTransforms, "partitionTransforms should not be null"));
        if (this.partitionTransforms.size() != outputColumnExprIds.size()) {
            throw new IllegalArgumentException(
                    "partitionTransforms must match outputColumnExprIds");
        }
    }

    @Override
    public HashAlgorithm getHashAlgorithm() {
        return HashAlgorithm.ICEBERG_TRANSFORM;
    }

    @Override
    public WriterAssignment getWriterAssignment() {
        // Iceberg ordinary INSERT historically reused Hive ScaleWriter. Keep that concurrency
        // behavior while making the logical partition calculation match Iceberg transforms.
        return WriterAssignment.SKEWED;
    }

    @Override
    public List<String> getPartitionTransforms() {
        return partitionTransforms;
    }
}