presto-main/src/main/java/io/prestosql/connector/system/StaticSystemTablesProvider.java/StaticSystemTablesProvider/getSystemTable
class StaticSystemTablesProvider:    @Override
    public Optional<SystemTable> getSystemTable(ConnectorSession session, SchemaTableName tableName)
    {
        return Optional.ofNullable(systemTablesMap.get(tableName));
    }