presto-main/src/main/java/io/prestosql/connector/system/GlobalSystemConnector.java/GlobalSystemConnector/GlobalSystemConnector
class GlobalSystemConnector:    public GlobalSystemConnector(Set<SystemTable> systemTables, Set<Procedure> procedures)
    {
        this.systemTables = ImmutableSet.copyOf(requireNonNull(systemTables, "systemTables is null"));
        this.procedures = ImmutableSet.copyOf(requireNonNull(procedures, "procedures is null"));
    }