presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/metadata/DatabaseShardManager.java/DatabaseShardManager/getShardNodes
class DatabaseShardManager:    @Override
    public ResultIterator<BucketShards> getShardNodes(long tableId, TupleDomain<RaptorColumnHandle> effectivePredicate)
    {
        return new ShardIterator(tableId, false, Optional.empty(), effectivePredicate, dbi);
    }