presto-hive/src/main/java/io/prestosql/plugin/hive/BackgroundHiveSplitLoader.java/BackgroundHiveSplitLoader/BucketSplitInfo
class BackgroundHiveSplitLoader:        private BucketSplitInfo(List<HiveColumnHandle> bucketColumns, int tableBucketCount, int readBucketCount, IntPredicate bucketFilter)
        {
            this.bucketColumns = ImmutableList.copyOf(requireNonNull(bucketColumns, "bucketColumns is null"));
            this.tableBucketCount = tableBucketCount;
            this.readBucketCount = readBucketCount;
            this.bucketFilter = requireNonNull(bucketFilter, "bucketFilter is null");
        }