presto-tpch/src/main/java/io/prestosql/plugin/tpch/TpchBucketFunction.java/TpchBucketFunction/toString
class TpchBucketFunction:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("bucketCount", bucketCount)
                .add("rowsPerBucket", rowsPerBucket)
                .toString();
    }