presto-main/src/main/java/io/prestosql/connector/system/SystemSplitManager.java/SystemSplitManager/SystemSplitManager
class SystemSplitManager:    public SystemSplitManager(InternalNodeManager nodeManager, SystemTablesProvider tables)
    {
        this.nodeManager = requireNonNull(nodeManager, "nodeManager is null");
        this.tables = requireNonNull(tables, "tables is null");
    }